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Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/tctx: work around xa_store() allocation error issue syzbot triggered the following WARN_ON: WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51 which is the WARN_ON_ONCE(!xa_empty(&tctx->xa)); sanity check in __io_uring_free() when a io_uring_task is going through its final put. The syzbot test case includes injecting memory allocation failures, and it very much looks like xa_store() can fail one of its memory allocations and end up with ->head being non-NULL even though no entries exist in the xarray. Until this issue gets sorted out, work around it by attempting to iterate entries in our xarray, and WARN_ON_ONCE() if one is found.

PUBLISHED Reserved 2024-12-27 | Published 2024-12-27 | Updated 2025-11-03 | Assigner Linux

Product status

Default status
unaffected

2b188cc1bb857a9d4701ae59aa7768b5124e262e (git) before 94ad56f61b873ffeebcc620d451eacfbdf9d40f0
affected

2b188cc1bb857a9d4701ae59aa7768b5124e262e (git) before 42882b583095dcf747da6e3af1daeff40e27033e
affected

2b188cc1bb857a9d4701ae59aa7768b5124e262e (git) before d5b2ddf1f90c7248eff9630b95895c8950f2f36d
affected

2b188cc1bb857a9d4701ae59aa7768b5124e262e (git) before 7eb75ce7527129d7f1fee6951566af409a37a1c4
affected

Default status
affected

5.1
affected

Any version before 5.1
unaffected

6.1.120 (semver)
unaffected

6.6.66 (semver)
unaffected

6.12.5 (semver)
unaffected

6.13 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/03/msg00001.html

git.kernel.org/...c/94ad56f61b873ffeebcc620d451eacfbdf9d40f0

git.kernel.org/...c/42882b583095dcf747da6e3af1daeff40e27033e

git.kernel.org/...c/d5b2ddf1f90c7248eff9630b95895c8950f2f36d

git.kernel.org/...c/7eb75ce7527129d7f1fee6951566af409a37a1c4

cve.org (CVE-2024-56584)

nvd.nist.gov (CVE-2024-56584)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.