ghsa-3qr3-w8jf-gq87
Vulnerability from github
Published
2025-01-19 12:31
Modified
2025-02-13 15:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

io_uring/sqpoll: zero sqd->thread on tctx errors

Syzkeller reports:

BUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341 Read of size 8 at addr ffff88803578c510 by task syz.2.3223/27552 Call Trace: ... kasan_report+0x143/0x180 mm/kasan/report.c:602 thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341 thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputime.c:639 getrusage+0x1000/0x1340 kernel/sys.c:1863 io_uring_show_fdinfo+0xdfe/0x1770 io_uring/fdinfo.c:197 seq_show+0x608/0x770 fs/proc/fd.c:68 ...

That's due to sqd->task not being cleared properly in cases where SQPOLL task tctx setup fails, which can essentially only happen with fault injection to insert allocation errors.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21633"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-19T11:15:08Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/sqpoll: zero sqd-\u003ethread on tctx errors\n\nSyzkeller reports:\n\nBUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341\nRead of size 8 at addr ffff88803578c510 by task syz.2.3223/27552\n Call Trace:\n  \u003cTASK\u003e\n  ...\n  kasan_report+0x143/0x180 mm/kasan/report.c:602\n  thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341\n  thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputime.c:639\n  getrusage+0x1000/0x1340 kernel/sys.c:1863\n  io_uring_show_fdinfo+0xdfe/0x1770 io_uring/fdinfo.c:197\n  seq_show+0x608/0x770 fs/proc/fd.c:68\n  ...\n\nThat\u0027s due to sqd-\u003etask not being cleared properly in cases where\nSQPOLL task tctx setup fails, which can essentially only happen with\nfault injection to insert allocation errors.",
  "id": "GHSA-3qr3-w8jf-gq87",
  "modified": "2025-02-13T15:31:22Z",
  "published": "2025-01-19T12:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21633"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b7cfa8b6c28a9fa22b86894166a1a34f6d630ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa7496d668c30ca7421b3bfdcd948ee861a13d17"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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