{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74290","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.881Z","datePublished":"2026-08-15T05:57:57.004Z","dateUpdated":"2026-08-17T05:16:36.420Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:16:36.420Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: Dont expose folded kernel pointers\n\nThe flow classifier falls back to addr_fold() for fields that are missing\nfrom packet headers. In map mode, userspace controls mask, xor, rshift,\naddend and divisor, and can observe the resulting classid through class\nstatistics. This allows a tc classifier in a user/network namespace to\nrecover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct().\n\nAlign with standard kernel practices for pointer hashing and replace the\nXOR folding with a keyed siphash (which is cryptographically secure)"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"],"versions":[{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"19f2ecf8ea564562c7e7a919cf38068dd9aa1c96","status":"affected","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"3d054001860270748405a3f9270c5fa0bf7ffc19","status":"affected","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"fb31fbe51c233f3bf47021121f63d2e42cac2d08","status":"affected","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a","status":"affected","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"6151159618198675e01c391676e579738286c135","status":"affected","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","lessThan":"f294fc71c4a0fa4964f6428a1b4e7929c1d83125","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"],"versions":[{"version":"2.6.25","status":"affected"},{"version":"0","lessThan":"2.6.25","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96"},{"url":"https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19"},{"url":"https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08"},{"url":"https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a"},{"url":"https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135"},{"url":"https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125"}],"title":"net/sched: cls_flow: Dont expose folded kernel pointers","x_generator":{"engine":"bippy-1.2.0"}}}}