{"api_version":"1","generated_at":"2026-07-26T20:47:22+00:00","cve":"CVE-2026-64530","urls":{"html":"https://cve.report/CVE-2026-64530","api":"https://cve.report/api/cve/CVE-2026-64530.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64530","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64530"},"summary":{"title":"net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-26 07:16:41","updated_at":"2026-07-26 07:16:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a","name":"https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447","name":"https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05","name":"https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159","name":"https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f","name":"https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9","name":"https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5","name":"https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64530","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64530","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 172ba7d46c202e679f3ccb10264c67416aaeb1c4 5ed3d6f85991656667059d3fa5a1d683ac58c447 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0b5b831122fc3789fff75be433ba3e4dd7b779d4 f42e8134a3a1074b834a574d404352f867ba994a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 73f7da5fd124f2cda9161e2e46114915e6e82e97 447d493034a9cf7bf13a2abac86d0573d907ec2f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f14b377d01d8357eba032b4cabc8c1149b458b6 e1270e69dcf2c3512c453484178f2e9dc0db3f05 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f14b377d01d8357eba032b4cabc8c1149b458b6 2140c2f3f2e7b066e1ae616ede8856cafd8015e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f14b377d01d8357eba032b4cabc8c1149b458b6 e28aedab9488343924d227b5a896faed67ce84d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f14b377d01d8357eba032b4cabc8c1149b458b6 a8a02897f2b479127db261de05cbf0c28b98d159 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5346df0591d10bc948761ca854b1fae6d2ef441 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.148 5.15.212 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.75 6.1.178 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.14 6.6.145 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7.2 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* 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-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5ed3d6f85991656667059d3fa5a1d683ac58c447","status":"affected","version":"172ba7d46c202e679f3ccb10264c67416aaeb1c4","versionType":"git"},{"lessThan":"f42e8134a3a1074b834a574d404352f867ba994a","status":"affected","version":"0b5b831122fc3789fff75be433ba3e4dd7b779d4","versionType":"git"},{"lessThan":"447d493034a9cf7bf13a2abac86d0573d907ec2f","status":"affected","version":"73f7da5fd124f2cda9161e2e46114915e6e82e97","versionType":"git"},{"lessThan":"e1270e69dcf2c3512c453484178f2e9dc0db3f05","status":"affected","version":"3f14b377d01d8357eba032b4cabc8c1149b458b6","versionType":"git"},{"lessThan":"2140c2f3f2e7b066e1ae616ede8856cafd8015e9","status":"affected","version":"3f14b377d01d8357eba032b4cabc8c1149b458b6","versionType":"git"},{"lessThan":"e28aedab9488343924d227b5a896faed67ce84d5","status":"affected","version":"3f14b377d01d8357eba032b4cabc8c1149b458b6","versionType":"git"},{"lessThan":"a8a02897f2b479127db261de05cbf0c28b98d159","status":"affected","version":"3f14b377d01d8357eba032b4cabc8c1149b458b6","versionType":"git"},{"status":"affected","version":"f5346df0591d10bc948761ca854b1fae6d2ef441","versionType":"git"},{"lessThan":"5.15.212","status":"affected","version":"5.15.148","versionType":"semver"},{"lessThan":"6.1.178","status":"affected","version":"6.1.75","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.14","versionType":"semver"},{"lessThan":"6.8","status":"affected","version":"6.7.2","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"5.15.148","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.75","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us."}],"providerMetadata":{"dateUpdated":"2026-07-26T06:28:42.970Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447"},{"url":"https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a"},{"url":"https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f"},{"url":"https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05"},{"url":"https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9"},{"url":"https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5"},{"url":"https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159"}],"title":"net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64530","datePublished":"2026-07-26T06:28:42.970Z","dateReserved":"2026-07-19T15:36:31.794Z","dateUpdated":"2026-07-26T06:28:42.970Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-26 07:16:41","lastModifiedDate":"2026-07-26 07:16:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64530","Ordinal":"1","Title":"net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle","CVE":"CVE-2026-64530","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64530","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us.","Type":"Description","Title":"net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle"}]}}}