ghsa-3w4p-cp93-7566
Vulnerability from github
Published
2024-04-17 12:32
Modified
2024-06-26 00:31
Details

In the Linux kernel, the following vulnerability has been resolved:

afs: Fix endless loop in directory parsing

If a directory has a block with only ".__afsXXXX" files in it (from uncompleted silly-rename), these .__afsXXXX files are skipped but without advancing the file position in the dir_context. This leads to afs_dir_iterate() repeating the block again and again.

Fix this by making the code that skips the .__afsXXXX file also manually advance the file position.

The symptoms are a soft lookup:

    watchdog: BUG: soft lockup - CPU#3 stuck for 52s! [check:5737]
    ...
    RIP: 0010:afs_dir_iterate_block+0x39/0x1fd
    ...
     ? watchdog_timer_fn+0x1a6/0x213
    ...
     ? asm_sysvec_apic_timer_interrupt+0x16/0x20
     ? afs_dir_iterate_block+0x39/0x1fd
     afs_dir_iterate+0x10a/0x148
     afs_readdir+0x30/0x4a
     iterate_dir+0x93/0xd3
     __do_sys_getdents64+0x6b/0xd4

This is almost certainly the actual fix for:

    https://bugzilla.kernel.org/show_bug.cgi?id=218496
Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-26848"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-17T11:15:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix endless loop in directory parsing\n\nIf a directory has a block with only \".__afsXXXX\" files in it (from\nuncompleted silly-rename), these .__afsXXXX files are skipped but without\nadvancing the file position in the dir_context.  This leads to\nafs_dir_iterate() repeating the block again and again.\n\nFix this by making the code that skips the .__afsXXXX file also manually\nadvance the file position.\n\nThe symptoms are a soft lookup:\n\n        watchdog: BUG: soft lockup - CPU#3 stuck for 52s! [check:5737]\n        ...\n        RIP: 0010:afs_dir_iterate_block+0x39/0x1fd\n        ...\n         ? watchdog_timer_fn+0x1a6/0x213\n        ...\n         ? asm_sysvec_apic_timer_interrupt+0x16/0x20\n         ? afs_dir_iterate_block+0x39/0x1fd\n         afs_dir_iterate+0x10a/0x148\n         afs_readdir+0x30/0x4a\n         iterate_dir+0x93/0xd3\n         __do_sys_getdents64+0x6b/0xd4\n\nThis is almost certainly the actual fix for:\n\n        https://bugzilla.kernel.org/show_bug.cgi?id=218496",
  "id": "GHSA-3w4p-cp93-7566",
  "modified": "2024-06-26T00:31:37Z",
  "published": "2024-04-17T12:32:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26848"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/058ed71e0f7aa3b6694ca357e23d084e5d3f2470"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/106e14ca55a0acb3236ee98813a1d243f8aa2d05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2afdd0cb02329464d77f3ec59468395c791a51a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c78be006ed9cb735ac2abf4fd64f3f4ea26da31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f7a07646655fb4108da527565dcdc80124b14c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76426abf9b980b46983f97de8e5b25047b4c9863"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80b15346492bdba677bbb0adefc611910e505f7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/854ebf45a4ddd4cadeffb6644e88d19020634e1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96370ba395c572ef496fd2c7afc4a1ab3dedd3f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c41f4935625218a2053a2dce1423c3054169809"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6ffae61ad9ebf2fdcb943135b2f30c85f49cd27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b94f434fe977689da4291dc21717790b9bd1c064"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f67898867b6b0f4542cddc7fe57997978b948a7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe02316e4933befc621fa125efb8f8b4d04cceec"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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