{"api_version":"1","generated_at":"2026-08-19T15:17:09+00:00","cve":"CVE-2026-74290","urls":{"html":"https://cve.report/CVE-2026-74290","api":"https://cve.report/api/cve/CVE-2026-74290.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74290","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74290"},"summary":{"title":"net/sched: cls_flow: Dont expose folded kernel pointers","description":"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)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:28","updated_at":"2026-08-17 06:19:22"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a","name":"https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19","name":"https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125","name":"https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08","name":"https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96","name":"https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135","name":"https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74290","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74290","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 3d054001860270748405a3f9270c5fa0bf7ffc19 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe fb31fbe51c233f3bf47021121f63d2e42cac2d08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe 6151159618198675e01c391676e579738286c135 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e5dfb815181fcb186d6080ac3a091eadff2d98fe f294fc71c4a0fa4964f6428a1b4e7929c1d83125 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.25","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.25 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74290","cve":"CVE-2026-74290","epss":"0.001720000","percentile":"0.069660000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_flow.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"19f2ecf8ea564562c7e7a919cf38068dd9aa1c96","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"},{"lessThan":"3d054001860270748405a3f9270c5fa0bf7ffc19","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"},{"lessThan":"fb31fbe51c233f3bf47021121f63d2e42cac2d08","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"},{"lessThan":"0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"},{"lessThan":"6151159618198675e01c391676e579738286c135","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"},{"lessThan":"f294fc71c4a0fa4964f6428a1b4e7929c1d83125","status":"affected","version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_flow.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.25"},{"lessThan":"2.6.25","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"2.6.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"2.6.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"2.6.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"2.6.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"2.6.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.25","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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)"}],"providerMetadata":{"dateUpdated":"2026-08-17T05:16:36.420Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74290","datePublished":"2026-08-15T05:57:57.004Z","dateReserved":"2026-08-15T05:44:03.881Z","dateUpdated":"2026-08-17T05:16:36.420Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:28","lastModifiedDate":"2026-08-17 06:19:22","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74290","Ordinal":"1","Title":"net/sched: cls_flow: Dont expose folded kernel pointers","CVE":"CVE-2026-74290","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74290","Ordinal":"1","NoteData":"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)","Type":"Description","Title":"net/sched: cls_flow: Dont expose folded kernel pointers"}]}}}