bpf: Limit bpf program signature size

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Summary

CVECVE-2026-45971
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:14 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Limit bpf program signature size Practical BPF signatures are significantly smaller than KMALLOC_MAX_CACHE_SIZE Allowing larger sizes opens the door for abuse by passing excessive size values and forcing the kernel into expensive allocation paths (via kmalloc_large or vmalloc).

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 349271568303695f0ac3563af153d2b4542f6986 5835a077c6f5c565d525eaca9fac01572b97a9b9 git Not specified
CNA Linux Linux affected 349271568303695f0ac3563af153d2b4542f6986 eb8166c79097996396468a341de258a798789d36 git Not specified
CNA Linux Linux affected 349271568303695f0ac3563af153d2b4542f6986 ea1535e28bb3773fc0b3cbd1f3842b808016990c git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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