bpf: Reject untrusted allocated-object pointers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98037
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: Reject untrusted allocated-object pointers When the final RCU read-side critical section ends, a local kptr is demoted to PTR_UNTRUSTED but retains MEM_ALLOC. The pointer may be NULL or may refer to an object whose lifetime is no longer protected. type_is_ptr_alloc_obj() nevertheless recognizes any PTR_TO_BTF_ID with MEM_ALLOC as a live allocated object. In particular, a refcount-only local kptr never carries NON_OWN_REF, so it still passes the bpf_refcount_acquire() argument check after RCU protection ends. The kfunc can then dereference NULL or stale memory. Make type_is_ptr_alloc_obj() reject PTR_UNTRUSTED pointers. Since type_is_non_owning_ref() is based on the same predicate, graph kfunc arguments obey the same live-object requirement. Fault-protected reads of the demoted pointer remain valid: writes are already rejected, and read fixups use bpf_may_fault_on_deref() rather than this predicate. [ kkd: Rewrote commit log ]

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.054060000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b12171533a9bb23cf6fba7262b479028b65e1e8 092c2874dc1b2060fa77a465a971acd4fdf87683 git Not specified
CNA Linux Linux affected 1b12171533a9bb23cf6fba7262b479028b65e1e8 135d542b97fa93e32c457d49d6e7b33ca7d05bae git Not specified
CNA Linux Linux affected 1b12171533a9bb23cf6fba7262b479028b65e1e8 6b1f786ad85a0b63393b76f5e634deab1a73198c git Not specified
CNA Linux Linux affected 1b12171533a9bb23cf6fba7262b479028b65e1e8 7441ee8276641bddaf1cba7bb75ef9c1458ceb3b git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 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/7441ee8276641bddaf1cba7bb75ef9c1458ceb3b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/092c2874dc1b2060fa77a465a971acd4fdf87683 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b1f786ad85a0b63393b76f5e634deab1a73198c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/135d542b97fa93e32c457d49d6e7b33ca7d05bae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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