CVE-2026-23346 (GCVE-0-2026-23346)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-06-19 11:57
VLAI?
Title
arm64: io: Extract user memory type in ioremap_prot()
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: io: Extract user memory type in ioremap_prot() The only caller of ioremap_prot() outside of the generic ioremap() implementation is generic_access_phys(), which passes a 'pgprot_t' value determined from the user mapping of the target 'pfn' being accessed by the kernel. On arm64, the 'pgprot_t' contains all of the non-address bits from the pte, including the permission controls, and so we end up returning a new user mapping from ioremap_prot() which faults when accessed from the kernel on systems with PAN: | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000 | ... | Call trace: | __memcpy_fromio+0x80/0xf8 | generic_access_phys+0x20c/0x2b8 | __access_remote_vm+0x46c/0x5b8 | access_remote_vm+0x18/0x30 | environ_read+0x238/0x3e8 | vfs_read+0xe4/0x2b0 | ksys_read+0xcc/0x178 | __arm64_sys_read+0x4c/0x68 Extract only the memory type from the user 'pgprot_t' in ioremap_prot() and assert that we're being passed a user mapping, to protect us against any changes in future that may require additional handling. To avoid falsely flagging users of ioremap(), provide our own ioremap() macro which simply wraps __ioremap_prot().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 64858b76ec67c5fc40fef8ec1841fecb78c1ebde (git)
Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < eeecafce5afffb4da703666ebefbd4d6e2a5abf6 (git)
Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 3d64dcc0799c2d6921ba027716b7be721eb19fa8 (git)
Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a (git)
Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 8f098037139b294050053123ab2bc0f819d08932 (git)
Create a notification for this product.
    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/io.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "64858b76ec67c5fc40fef8ec1841fecb78c1ebde",
              "status": "affected",
              "version": "893dea9ccd08dab924839354aba21d4ed7a9abc0",
              "versionType": "git"
            },
            {
              "lessThan": "eeecafce5afffb4da703666ebefbd4d6e2a5abf6",
              "status": "affected",
              "version": "893dea9ccd08dab924839354aba21d4ed7a9abc0",
              "versionType": "git"
            },
            {
              "lessThan": "3d64dcc0799c2d6921ba027716b7be721eb19fa8",
              "status": "affected",
              "version": "893dea9ccd08dab924839354aba21d4ed7a9abc0",
              "versionType": "git"
            },
            {
              "lessThan": "d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a",
              "status": "affected",
              "version": "893dea9ccd08dab924839354aba21d4ed7a9abc0",
              "versionType": "git"
            },
            {
              "lessThan": "8f098037139b294050053123ab2bc0f819d08932",
              "status": "affected",
              "version": "893dea9ccd08dab924839354aba21d4ed7a9abc0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/io.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.17",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.7",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: io: Extract user memory type in ioremap_prot()\n\nThe only caller of ioremap_prot() outside of the generic ioremap()\nimplementation is generic_access_phys(), which passes a \u0027pgprot_t\u0027 value\ndetermined from the user mapping of the target \u0027pfn\u0027 being accessed by\nthe kernel. On arm64, the \u0027pgprot_t\u0027 contains all of the non-address\nbits from the pte, including the permission controls, and so we end up\nreturning a new user mapping from ioremap_prot() which faults when\naccessed from the kernel on systems with PAN:\n\n  | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000\n  | ...\n  | Call trace:\n  |   __memcpy_fromio+0x80/0xf8\n  |   generic_access_phys+0x20c/0x2b8\n  |   __access_remote_vm+0x46c/0x5b8\n  |   access_remote_vm+0x18/0x30\n  |   environ_read+0x238/0x3e8\n  |   vfs_read+0xe4/0x2b0\n  |   ksys_read+0xcc/0x178\n  |   __arm64_sys_read+0x4c/0x68\n\nExtract only the memory type from the user \u0027pgprot_t\u0027 in ioremap_prot()\nand assert that we\u0027re being passed a user mapping, to protect us against\nany changes in future that may require additional handling. To avoid\nfalsely flagging users of ioremap(), provide our own ioremap() macro\nwhich simply wraps __ioremap_prot()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T11:57:35.219Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932"
        }
      ],
      "title": "arm64: io: Extract user memory type in ioremap_prot()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23346",
    "datePublished": "2026-03-25T10:27:33.133Z",
    "dateReserved": "2026-01-13T15:37:45.999Z",
    "dateUpdated": "2026-06-19T11:57:35.219Z",
    "state": "PUBLISHED"
  },
  "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.