rseq: Fix using an uninitialized stack variable in rseq_exit_user_update()

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Summary

CVECVE-2026-53243
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:42 UTC
Updated2026-06-25 09:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: rseq: Fix using an uninitialized stack variable in rseq_exit_user_update() There is an bug in which an uninitialized stack variable is used in rseq_exit_user_update() as reported by syzbot: BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline] The local variable: struct rseq_ids ids = { .cpu_id = task_cpu(t), .mm_cid = task_mm_cid(t), .node_id = cpu_to_node(ids.cpu_id), }; According to the C standard, the evaluation order of expressions in an initializer list is indeterminately sequenced. The compiler (Clang, in this KMSAN build) evaluates `cpu_to_node(ids.cpu_id)` *before* `ids.cpu_id` is initialized with `task_cpu(t)`. This is fixed by moving the assignment of ids.node_id outside the structure initialization.

Risk And Classification

EPSS: 0.001620000 probability, percentile 0.057690000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d242126fd21ab8f1631fdbc8589e43a9d4229f3b e12d20a63b61aaf9de4772effccf42cc9a003e58 git Not specified
CNA Linux Linux affected 82f572449cfe75f12ea985986da60e11f308f77d 6d99479799c69c3cb588fcda19c81d8f61d64ecd git Not specified
CNA Linux Linux affected 7.0.10 7.0.13 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6d99479799c69c3cb588fcda19c81d8f61d64ecd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e12d20a63b61aaf9de4772effccf42cc9a003e58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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