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CVE-2026-99230

io_uring/cmd: don't leave list poison in ->hash_node

Not scored
Published
Updated
Reserved
Assigned by
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/cmd: don't leave list poison in ->hash_node io_uring_cmd_del_cancelable() uses hlist_del() to take a command off ->cancelable_uring_cmd, which leaves LIST_POISON1/2 behind in ->hash_node. Requests are recycled through the request cache without being reinitialised, and not every user of ->hash_node sets it up before it is used: If a vectored futex wait is woken while futex_wait_multiple_setup() is still queueing the futexes, io_futexv_wait() doesn't add the request to ->futex_list, and leaves the completion to the task_work queued by the wake up. io_futexv_complete() ends in __io_futex_complete(), whose hlist_del_init() is fine for a request that is unhashed, which is how all other users of the node leave it. If the request was a cancelable uring_cmd in its previous life, e.g. a ublk FETCH_REQ, it writes through LIST_POISON2: Oops: general protection fault, probably for non-canonical address KASAN: maybe wild-memory-access in range [0xdead000000000120-...] RIP: 0010:io_futexv_complete+0x219/0x420 Call Trace: tctx_task_work_run+0x804/0x950 tctx_task_work+0x71/0xa0 task_work_run+0x118/0x200 Leave the node unhashed.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)
Not scored

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 93b8cc60c37b9d17732b7a297e5dca29b50a990d – < cc7f13d006fcefed9564bd79f135b51d344e9c77
    • affected 93b8cc60c37b9d17732b7a297e5dca29b50a990d – < 2d5af21422060c088f6e4fb0f1e7dcf5bcdd6707
    • affected 93b8cc60c37b9d17732b7a297e5dca29b50a990d – < 685b49483200384d7f49d338af476e26e6824637

  • Linux · Linux

    • affected 6.7
    • unaffected < 6.7
    • unaffected 6.12.115 – ≤ 6.12.*
    • unaffected 6.18.60 – ≤ 6.18.*
    • unaffected 7.2.14 – ≤ 7.2.*

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .