FKIE_CVE-2022-50673

Vulnerability from fkie_nvd - Published: 2025-12-09 16:17 - Updated: 2026-06-17 05:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in ext4_orphan_cleanup I caught a issue as follows: ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710 CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/026a4490b5381229a30f23d073b58e8e35ee6858
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7f801a1593cb957f73659732836b2dafbdfc7709",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "026a4490b5381229a30f23d073b58e8e35ee6858",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "7223d5e75f26352354ea2c0ccf8b579821b52adf",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "cf0e0817b0f925b70d101d7014ea81b7094e1159",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "c2bdbd4c69308835d1b6f6ba74feeccbfe113478",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "7908b8a541b1578cc61b4da7f19b604a931441da",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            },
            {
              "lessThan": "a71248b1accb2b42e4980afef4fa4a27fa0e36f5",
              "status": "affected",
              "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_orphan_cleanup\n\nI caught a issue as follows:\n==================================================================\n BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0\n Read of size 8 at addr ffff88814b13f378 by task mount/710\n\n CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x73/0x9f\n  print_report+0x25d/0x759\n  kasan_report+0xc0/0x120\n  __asan_load8+0x99/0x140\n  __list_add_valid+0x28/0x1a0\n  ext4_orphan_cleanup+0x564/0x9d0 [ext4]\n  __ext4_fill_super+0x48e2/0x5300 [ext4]\n  ext4_fill_super+0x19f/0x3a0 [ext4]\n  get_tree_bdev+0x27b/0x450\n  ext4_get_tree+0x19/0x30 [ext4]\n  vfs_get_tree+0x49/0x150\n  path_mount+0xaae/0x1350\n  do_mount+0xe2/0x110\n  __x64_sys_mount+0xf0/0x190\n  do_syscall_64+0x35/0x80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n  \u003c/TASK\u003e\n [...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n  ext4_orphan_cleanup\n   --- loop1: assume last_orphan is 12 ---\n    list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan)\n    ext4_truncate --\u003e return 0\n      ext4_inode_attach_jinode --\u003e return -ENOMEM\n    iput(inode) --\u003e free inode\u003c12\u003e\n   --- loop2: last_orphan is still 12 ---\n    list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan);\n    // use inode\u003c12\u003e and trigger UAF\n\nTo solve this issue, we need to propagate the return value of\next4_inode_attach_jinode() appropriately."
    }
  ],
  "id": "CVE-2022-50673",
  "lastModified": "2026-06-17T05:23:58.440",
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-50673",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-16T15:48:47.172262Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-12-09T16:17:19.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/026a4490b5381229a30f23d073b58e8e35ee6858"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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