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CVE-2025-21633 – Apache Linux Kernel IO Uring Ring Buffer Use After Free Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21633 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 19, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added Reference https://git.kernel.org/stable/c/4b7cfa8b6c28a9fa22b86894166a1a34f6d630ba
    Added Reference https://git.kernel.org/stable/c/aa7496d668c30ca7421b3bfdcd948ee861a13d17
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