GHSA-3QR3-W8JF-GQ87
Vulnerability from github – Published: 2025-01-19 12:31 – Updated: 2025-02-13 15:31In 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.
{
"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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