bpf: Reject arena frees below the arena base

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93045
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:57 UTC
Updated2026-09-17 17:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 90453eaf8f14e7be0ab03983f2a93aeb6b990a58 git Not specified
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20 git Not specified
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 8a08635656037aee9c12231ed384449c4ffb1a93 git Not specified
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 b5a71cb2db6d84ac0042549dcec266b18429d41e git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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