net/sched: cls_flow: Dont expose folded kernel pointers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74290
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:28 UTC
Updated2026-08-17 06:19:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)

Risk And Classification

EPSS: 0.001720000 probability, percentile 0.069660000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 git Not specified
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 3d054001860270748405a3f9270c5fa0bf7ffc19 git Not specified
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe fb31fbe51c233f3bf47021121f63d2e42cac2d08 git Not specified
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a git Not specified
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 6151159618198675e01c391676e579738286c135 git Not specified
CNA Linux Linux affected e5dfb815181fcb186d6080ac3a091eadff2d98fe f294fc71c4a0fa4964f6428a1b4e7929c1d83125 git Not specified
CNA Linux Linux affected 2.6.25 Not specified
CNA Linux Linux unaffected 2.6.25 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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