CVE-2026-64530

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64530", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.794Z", "datePublished": "2026-07-26T06:28:42.970Z", "dateUpdated": "2026-10-19T20:48:38.296Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:07.900Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - On a transparent bridge or traffic-shaping gateway configured with the RED qevent and act_ct, unauthenticated remote IP fragments reach red_enqueue() through normal receive, bridge-forwarding, and egress-qdisc processing. No local netlink access is required to trigger the deployed configuration.\nAC:L - The attacker controls fragment contents and ordering and can drive RED into deterministic hard-mark or drop conditions with sustained traffic. No race or condition outside the attacker's control must be won.\nPR:N - CAP_NET_ADMIN is required to create the vulnerable configuration, but a remote attacker sending fragments through an already configured appliance needs no privileges or authentication. Local triggering is also possible with namespaced CAP_NET_ADMIN.\nUI:N - Triggering requires only attacker-generated fragmented traffic and does not depend on a victim performing any action.\nS:U - The corruption occurs within the host kernel and compromises resources governed by that same security authority. This remains unchanged scope even when used for namespace escape or kernel privilege escalation.\nC:H - The reclaimable sk_buff use-after-free and corrupted defragmentation-tree links can be leveraged through attacker-controlled network heap spraying to disclose arbitrary kernel memory.\nI:H - RED overwrites linkage fields that overlap the defragmentation RB node and may free the object while it remains referenced, enabling subsequent writes through freed or attacker-reclaimed kernel objects and potential code execution.\nA:H - The dangling fragment-tree entry can cause immediate or deferred use-after-free, double-free, invalid tree operations, and kernel panic when another fragment arrives or the queue expires. The attacker can trigger this repeatedly with fragmented traffic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_api.c"], "versions": [{"version": "172ba7d46c202e679f3ccb10264c67416aaeb1c4", "lessThan": "5ed3d6f85991656667059d3fa5a1d683ac58c447", "status": "affected", "versionType": "git"}, {"version": "0b5b831122fc3789fff75be433ba3e4dd7b779d4", "lessThan": "f42e8134a3a1074b834a574d404352f867ba994a", "status": "affected", "versionType": "git"}, {"version": "73f7da5fd124f2cda9161e2e46114915e6e82e97", "lessThan": "447d493034a9cf7bf13a2abac86d0573d907ec2f", "status": "affected", "versionType": "git"}, {"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "e1270e69dcf2c3512c453484178f2e9dc0db3f05", "status": "affected", "versionType": "git"}, {"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "2140c2f3f2e7b066e1ae616ede8856cafd8015e9", "status": "affected", "versionType": "git"}, {"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "e28aedab9488343924d227b5a896faed67ce84d5", "status": "affected", "versionType": "git"}, {"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "a8a02897f2b479127db261de05cbf0c28b98d159", "status": "affected", "versionType": "git"}, {"version": "f5346df0591d10bc948761ca854b1fae6d2ef441", "status": "affected", "versionType": "git"}, {"version": "5.15.148", "lessThan": "5.15.212", "status": "affected", "versionType": "semver"}, {"version": "6.1.75", "lessThan": "6.1.178", "status": "affected", "versionType": "semver"}, {"version": "6.6.14", "lessThan": "6.6.145", "status": "affected", "versionType": "semver"}, {"version": "6.7.2", "lessThan": "6.8", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_api.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "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": "5.15.148", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.75", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.14", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.2"}]}]}], "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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64530", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:41:44.353854Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:48:38.296Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64530", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:41:44.353854Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:41:44.913Z"}}], "cna": {"title": "net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - On a transparent bridge or traffic-shaping gateway configured with the RED qevent and act_ct, unauthenticated remote IP fragments reach red_enqueue() through normal receive, bridge-forwarding, and egress-qdisc processing. No local netlink access is required to trigger the deployed configuration.\nAC:L - The attacker controls fragment contents and ordering and can drive RED into deterministic hard-mark or drop conditions with sustained traffic. No race or condition outside the attacker's control must be won.\nPR:N - CAP_NET_ADMIN is required to create the vulnerable configuration, but a remote attacker sending fragments through an already configured appliance needs no privileges or authentication. Local triggering is also possible with namespaced CAP_NET_ADMIN.\nUI:N - Triggering requires only attacker-generated fragmented traffic and does not depend on a victim performing any action.\nS:U - The corruption occurs within the host kernel and compromises resources governed by that same security authority. This remains unchanged scope even when used for namespace escape or kernel privilege escalation.\nC:H - The reclaimable sk_buff use-after-free and corrupted defragmentation-tree links can be leveraged through attacker-controlled network heap spraying to disclose arbitrary kernel memory.\nI:H - RED overwrites linkage fields that overlap the defragmentation RB node and may free the object while it remains referenced, enabling subsequent writes through freed or attacker-reclaimed kernel objects and potential code execution.\nA:H - The dangling fragment-tree entry can cause immediate or deferred use-after-free, double-free, invalid tree operations, and kernel panic when another fragment arrives or the queue expires. The attacker can trigger this repeatedly with fragmented traffic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "172ba7d46c202e679f3ccb10264c67416aaeb1c4", "lessThan": "5ed3d6f85991656667059d3fa5a1d683ac58c447", "versionType": "git"}, {"status": "affected", "version": "0b5b831122fc3789fff75be433ba3e4dd7b779d4", "lessThan": "f42e8134a3a1074b834a574d404352f867ba994a", "versionType": "git"}, {"status": "affected", "version": "73f7da5fd124f2cda9161e2e46114915e6e82e97", "lessThan": "447d493034a9cf7bf13a2abac86d0573d907ec2f", "versionType": "git"}, {"status": "affected", "version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "e1270e69dcf2c3512c453484178f2e9dc0db3f05", "versionType": "git"}, {"status": "affected", "version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "2140c2f3f2e7b066e1ae616ede8856cafd8015e9", "versionType": "git"}, {"status": "affected", "version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "e28aedab9488343924d227b5a896faed67ce84d5", "versionType": "git"}, {"status": "affected", "version": "3f14b377d01d8357eba032b4cabc8c1149b458b6", "lessThan": "a8a02897f2b479127db261de05cbf0c28b98d159", "versionType": "git"}, {"status": "affected", "version": "f5346df0591d10bc948761ca854b1fae6d2ef441", "versionType": "git"}, {"status": "affected", "version": "5.15.148", "lessThan": "5.15.212", "versionType": "semver"}, {"status": "affected", "version": "6.1.75", "lessThan": "6.1.178", "versionType": "semver"}, {"status": "affected", "version": "6.6.14", "lessThan": "6.6.145", "versionType": "semver"}, {"status": "affected", "version": "6.7.2", "lessThan": "6.8", "versionType": "semver"}], "programFiles": ["net/sched/cls_api.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/cls_api.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.15.148"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "6.1.75"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "6.6.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.7.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:07.900Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64530", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:48:38.296Z", "dateReserved": "2026-07-19T15:36:31.794Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-26T06:28:42.970Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "81006F8F-DDE6-43DB-A9CE-B235048A8E5C", "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.15.148", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FC56DFDB-4DFE-4EBE-924F-0F1EE7C6604C", "versionEndExcluding": "6.1.178", "versionStartIncluding": "6.1.75", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6CBCD5D0-7F6B-4BB3-A5F5-A8D944691BDC", "versionEndExcluding": "6.6.145", "versionStartIncluding": "6.6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2546B8AE-FCD4-471D-9ED0-0A15E26EFD33", "versionEndExcluding": "6.12.97", "versionStartIncluding": "6.7.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "67D87928-1419-4529-9201-42C059678CB4", "versionEndExcluding": "6.18.40", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FE149C35-43CC-473B-86E3-978E6A9CBC55", "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-64530", "lastModified": "2026-11-13T18:27:42.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64530", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:41:44.353854Z", "version": "2.0.3"}}]}, "published": "2026-07-26T07:16:41.680", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle", "id": "2507345", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507345"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's traffic control (TC) classifier application programming interface (API). The `tcf_qevent_handle` function does not properly handle a consumed socket buffer (`skb`) when it is processed by the defragmentation engine. This can lead to a Use-After-Free (UAF) vulnerability, where the system attempts to use memory that has already been freed. An attacker could potentially exploit this to cause system instability or execute arbitrary code."], "name": "CVE-2026-64530", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64530\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64530\nhttps://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[172ba7d46c202e679f3ccb10264c67416aaeb1c4,5ed3d6f85991656667059d3fa5a1d683ac58c447)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0b5b831122fc3789fff75be433ba3e4dd7b779d4,f42e8134a3a1074b834a574d404352f867ba994a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[73f7da5fd124f2cda9161e2e46114915e6e82e97,447d493034a9cf7bf13a2abac86d0573d907ec2f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f14b377d01d8357eba032b4cabc8c1149b458b6,e1270e69dcf2c3512c453484178f2e9dc0db3f05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f14b377d01d8357eba032b4cabc8c1149b458b6,2140c2f3f2e7b066e1ae616ede8856cafd8015e9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f14b377d01d8357eba032b4cabc8c1149b458b6,e28aedab9488343924d227b5a896faed67ce84d5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f14b377d01d8357eba032b4cabc8c1149b458b6,a8a02897f2b479127db261de05cbf0c28b98d159)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f5346df0591d10bc948761ca854b1fae6d2ef441"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.148,5.15.212)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.75,6.1.178)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.14,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.7.2,6.8)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-26T10:15:03.556826+00:00", "updated": "2026-10-20T14:30:14.013515+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}