perf: Require kernel access for text poke events

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Summary

CVECVE-2026-98655
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:18 UTC
Updated2026-10-21 13:21:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.

Risk And Classification

EPSS: 0.001800000 probability, percentile 0.072420000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e17d43b93e544f5016c0251d2074c15568d5d963 8c38cb055f6a9651198780e4e4d5283de4039f79 git Not specified
CNA Linux Linux affected e17d43b93e544f5016c0251d2074c15568d5d963 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7 git Not specified
CNA Linux Linux affected e17d43b93e544f5016c0251d2074c15568d5d963 e506333d1b9f42f1e402acebf1283af3c44a3809 git Not specified
CNA Linux Linux affected e17d43b93e544f5016c0251d2074c15568d5d963 677d0b51ac1a0db55d768c4c6399210b3de0795b git Not specified
CNA Linux Linux affected e17d43b93e544f5016c0251d2074c15568d5d963 357e8a77a501d96c9517f01f4a211eed5e9c9184 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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