CVE-2025-38591 (GCVE-0-2025-38591)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-06-11 18:44
VLAI?
Title
bpf: Reject narrower access to pointer ctx fields
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject narrower access to pointer ctx fields The following BPF program, simplified from a syzkaller repro, causes a kernel warning: r0 = *(u8 *)(r1 + 169); exit; With pointer field sk being at offset 168 in __sk_buff. This access is detected as a narrower read in bpf_skb_is_valid_access because it doesn't match offsetof(struct __sk_buff, sk). It is therefore allowed and later proceeds to bpf_convert_ctx_access. Note that for the "is_narrower_load" case in the convert_ctx_accesses(), the insn->off is aligned, so the cnt may not be 0 because it matches the offsetof(struct __sk_buff, sk) in the bpf_convert_ctx_access. However, the target_size stays 0 and the verifier errors with a kernel warning: verifier bug: error during ctx access conversion(1) This patch fixes that to return a proper "invalid bpf_context access off=X size=Y" error on the load instruction. The same issue affects multiple other fields in context structures that allow narrow access. Some other non-affected fields (for sk_msg, sk_lookup, and sockopt) were also changed to use bpf_ctx_range_ptr for consistency. Note this syzkaller crash was reported in the "Closes" link below, which used to be about a different bug, fixed in commit fce7bd8e385a ("bpf/verifier: Handle BPF_LOAD_ACQ instructions in insn_def_regno()"). Because syzbot somehow confused the two bugs, the new crash and repro didn't get reported to the mailing list.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < 7847c4140e06f6e87229faae22cc38525334c156 (git)
Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < feae34c992eb7191862fb1594c704fbbf650fef8 (git)
Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < 33660d44e789edb4f303210c813fc56d56377a90 (git)
Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < 058a0da4f6d916a79b693384111bb80a90d73763 (git)
Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < 202900ceeef67458c964c2af6e1427c8e533ea7c (git)
Affected: f96da09473b52c09125cc9bf7d7d4576ae8229e0 , < e09299225d5ba3916c91ef70565f7d2187e4cca0 (git)
Create a notification for this product.
    Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-38591",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:41:20.077651Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-11T18:44:11.247Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/cgroup.c",
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7847c4140e06f6e87229faae22cc38525334c156",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            },
            {
              "lessThan": "feae34c992eb7191862fb1594c704fbbf650fef8",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            },
            {
              "lessThan": "33660d44e789edb4f303210c813fc56d56377a90",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            },
            {
              "lessThan": "058a0da4f6d916a79b693384111bb80a90d73763",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            },
            {
              "lessThan": "202900ceeef67458c964c2af6e1427c8e533ea7c",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            },
            {
              "lessThan": "e09299225d5ba3916c91ef70565f7d2187e4cca0",
              "status": "affected",
              "version": "f96da09473b52c09125cc9bf7d7d4576ae8229e0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/cgroup.c",
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.249",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.249",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.199",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.162",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject narrower access to pointer ctx fields\n\nThe following BPF program, simplified from a syzkaller repro, causes a\nkernel warning:\n\n    r0 = *(u8 *)(r1 + 169);\n    exit;\n\nWith pointer field sk being at offset 168 in __sk_buff. This access is\ndetected as a narrower read in bpf_skb_is_valid_access because it\ndoesn\u0027t match offsetof(struct __sk_buff, sk). It is therefore allowed\nand later proceeds to bpf_convert_ctx_access. Note that for the\n\"is_narrower_load\" case in the convert_ctx_accesses(), the insn-\u003eoff\nis aligned, so the cnt may not be 0 because it matches the\noffsetof(struct __sk_buff, sk) in the bpf_convert_ctx_access. However,\nthe target_size stays 0 and the verifier errors with a kernel warning:\n\n    verifier bug: error during ctx access conversion(1)\n\nThis patch fixes that to return a proper \"invalid bpf_context access\noff=X size=Y\" error on the load instruction.\n\nThe same issue affects multiple other fields in context structures that\nallow narrow access. Some other non-affected fields (for sk_msg,\nsk_lookup, and sockopt) were also changed to use bpf_ctx_range_ptr for\nconsistency.\n\nNote this syzkaller crash was reported in the \"Closes\" link below, which\nused to be about a different bug, fixed in\ncommit fce7bd8e385a (\"bpf/verifier: Handle BPF_LOAD_ACQ instructions\nin insn_def_regno()\"). Because syzbot somehow confused the two bugs,\nthe new crash and repro didn\u0027t get reported to the mailing list."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:31:12.628Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7847c4140e06f6e87229faae22cc38525334c156"
        },
        {
          "url": "https://git.kernel.org/stable/c/feae34c992eb7191862fb1594c704fbbf650fef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/33660d44e789edb4f303210c813fc56d56377a90"
        },
        {
          "url": "https://git.kernel.org/stable/c/058a0da4f6d916a79b693384111bb80a90d73763"
        },
        {
          "url": "https://git.kernel.org/stable/c/202900ceeef67458c964c2af6e1427c8e533ea7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e09299225d5ba3916c91ef70565f7d2187e4cca0"
        }
      ],
      "title": "bpf: Reject narrower access to pointer ctx fields",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38591",
    "datePublished": "2025-08-19T17:03:12.508Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2026-06-11T18:44:11.247Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-38591\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:41:20.077651Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:38:15.248Z\"}}], \"cna\": {\"title\": \"bpf: Reject narrower access to pointer ctx fields\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"7847c4140e06f6e87229faae22cc38525334c156\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"feae34c992eb7191862fb1594c704fbbf650fef8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"33660d44e789edb4f303210c813fc56d56377a90\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"058a0da4f6d916a79b693384111bb80a90d73763\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"202900ceeef67458c964c2af6e1427c8e533ea7c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f96da09473b52c09125cc9bf7d7d4576ae8229e0\", \"lessThan\": \"e09299225d5ba3916c91ef70565f7d2187e4cca0\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/cgroup.c\", \"net/core/filter.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.249\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.67\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/cgroup.c\", \"net/core/filter.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7847c4140e06f6e87229faae22cc38525334c156\"}, {\"url\": \"https://git.kernel.org/stable/c/feae34c992eb7191862fb1594c704fbbf650fef8\"}, {\"url\": \"https://git.kernel.org/stable/c/33660d44e789edb4f303210c813fc56d56377a90\"}, {\"url\": \"https://git.kernel.org/stable/c/058a0da4f6d916a79b693384111bb80a90d73763\"}, {\"url\": \"https://git.kernel.org/stable/c/202900ceeef67458c964c2af6e1427c8e533ea7c\"}, {\"url\": \"https://git.kernel.org/stable/c/e09299225d5ba3916c91ef70565f7d2187e4cca0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Reject narrower access to pointer ctx fields\\n\\nThe following BPF program, simplified from a syzkaller repro, causes a\\nkernel warning:\\n\\n    r0 = *(u8 *)(r1 + 169);\\n    exit;\\n\\nWith pointer field sk being at offset 168 in __sk_buff. This access is\\ndetected as a narrower read in bpf_skb_is_valid_access because it\\ndoesn\u0027t match offsetof(struct __sk_buff, sk). It is therefore allowed\\nand later proceeds to bpf_convert_ctx_access. Note that for the\\n\\\"is_narrower_load\\\" case in the convert_ctx_accesses(), the insn-\u003eoff\\nis aligned, so the cnt may not be 0 because it matches the\\noffsetof(struct __sk_buff, sk) in the bpf_convert_ctx_access. However,\\nthe target_size stays 0 and the verifier errors with a kernel warning:\\n\\n    verifier bug: error during ctx access conversion(1)\\n\\nThis patch fixes that to return a proper \\\"invalid bpf_context access\\noff=X size=Y\\\" error on the load instruction.\\n\\nThe same issue affects multiple other fields in context structures that\\nallow narrow access. Some other non-affected fields (for sk_msg,\\nsk_lookup, and sockopt) were also changed to use bpf_ctx_range_ptr for\\nconsistency.\\n\\nNote this syzkaller crash was reported in the \\\"Closes\\\" link below, which\\nused to be about a different bug, fixed in\\ncommit fce7bd8e385a (\\\"bpf/verifier: Handle BPF_LOAD_ACQ instructions\\nin insn_def_regno()\\\"). Because syzbot somehow confused the two bugs,\\nthe new crash and repro didn\u0027t get reported to the mailing list.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.249\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.67\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.1\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"4.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:31:12.628Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38591\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:11.247Z\", \"dateReserved\": \"2025-04-16T04:51:24.026Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-08-19T17:03:12.508Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.