bpf: Require MEM_PERCPU for percpu kptr stores

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98039
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:32 UTC
Updated2026-09-25 11:17:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Require MEM_PERCPU for percpu kptr stores map_kptr_match_type() treats perm_flags as the set of register type flags that a kptr field permits. Adding MEM_PERCPU to that set for BPF_KPTR_PERCPU does not require the source register to carry it, however. The subset test consequently accepts both a plain bpf_obj_new() allocation and a referenced kernel pointer into a __percpu_kptr map field. Loads from the field are always marked MEM_PERCPU. Consumers then treat the stored value as the cookie returned by bpf_percpu_obj_new(): per-CPU pointer helpers relocate it, and map teardown selects the per-CPU free path. A plain allocation can therefore provide an arbitrary kernel read/write, while a kernel pointer can be relocated into an invalid address or sent through a missing destructor. Require the source MEM_PERCPU flag to match the destination field kind. This preserves valid bpf_percpu_obj_new() stores and rejects both the program-BTF and kernel-BTF variants.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.053850000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 36d8bdf75a93190e5669b9d1d95994e13e15ba1d aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f git Not specified
CNA Linux Linux affected 36d8bdf75a93190e5669b9d1d95994e13e15ba1d 0bdd6121c8dd5f1764efe701ce26bb8e15acb172 git Not specified
CNA Linux Linux affected 36d8bdf75a93190e5669b9d1d95994e13e15ba1d ad4ebae5dbc2d47b544aa54f03c12490065be08a git Not specified
CNA Linux Linux affected 36d8bdf75a93190e5669b9d1d95994e13e15ba1d 048029ba1c793f8cabc4ad5eea765da01903f8f1 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/048029ba1c793f8cabc4ad5eea765da01903f8f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0bdd6121c8dd5f1764efe701ce26bb8e15acb172 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad4ebae5dbc2d47b544aa54f03c12490065be08a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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