{"id":"CVE-2026-53011","state":"PUBLISHED","title":"net/sched: taprio: fix use-after-free in advance_sched() on schedule switch","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: taprio: fix use-after-free in advance_sched() on schedule switch\n\nIn advance_sched(), when should_change_schedules() returns true,\nswitch_schedules() is called to promote the admin schedule to oper.\nswitch_schedules() queues the old oper schedule for RCU freeing via\ncall_rcu(), but 'next' still points into an entry of the old oper\nschedule. The subsequent 'next->end_time = end_time' and\nrcu_assign_pointer(q->current_entry, next) are use-after-free.\n\nFix this by selecting 'next' from the new oper schedule immediately\nafter switch_schedules(), and using its pre-calculated end_time.\nsetup_first_end_time() sets the first entry's end_time to\nbase_time + interval when the schedule is installed, so the value\nis already correct.\n\nThe deleted 'end_time = sched_base_time(admin)' assignment was also\nharmful independently: it would overwrite the new first entry's\npre-calculated end_time with just base_time.","publishedAt":"2026-06-24T16:29:22.082Z","updatedAt":"2026-10-19T19:47:13.860Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"a8fc396519ef4f081bc545e88f61241728bb78d7","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"3471874578160a28c171a607fa069f24062634b8","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"7256996e1ef553716817f3bfd077c2f3b48b582f","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"eee072fe16c646190d33ae69c9983d8de1562bf8","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"1bd286fa3e21200133478ed523cc6a2788baf38a","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"b73235da5dde77ed1264f9767b62c28c9d71fd78","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"0e62171df8ed4804d00db088f17eed06468233fa","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"105425b1969c5affe532713cfac1c0b320d7ac2b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_taprio.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_taprio.c"]}],"references":["https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7","https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8","https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f","https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8","https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a","https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78","https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa","https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53011.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53011","state":"PUBLISHED","datePublished":"2026-06-24T16:29:22.082Z","dateUpdated":"2026-10-19T19:47:13.860Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.378Z"},"containers":{"cna":{"title":"net/sched: taprio: fix use-after-free in advance_sched() on schedule switch","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: taprio: fix use-after-free in advance_sched() on schedule switch\n\nIn advance_sched(), when should_change_schedules() returns true,\nswitch_schedules() is called to promote the admin schedule to oper.\nswitch_schedules() queues the old oper schedule for RCU freeing via\ncall_rcu(), but 'next' still points into an entry of the old oper\nschedule. The subsequent 'next->end_time = end_time' and\nrcu_assign_pointer(q->current_entry, next) are use-after-free.\n\nFix this by selecting 'next' from the new oper schedule immediately\nafter switch_schedules(), and using its pre-calculated end_time.\nsetup_first_end_time() sets the first entry's end_time to\nbase_time + interval when the schedule is installed, so the value\nis already correct.\n\nThe deleted 'end_time = sched_base_time(admin)' assignment was also\nharmful independently: it would overwrite the new first entry's\npre-calculated end_time with just base_time."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"a8fc396519ef4f081bc545e88f61241728bb78d7","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"3471874578160a28c171a607fa069f24062634b8","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"7256996e1ef553716817f3bfd077c2f3b48b582f","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"eee072fe16c646190d33ae69c9983d8de1562bf8","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"1bd286fa3e21200133478ed523cc6a2788baf38a","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"b73235da5dde77ed1264f9767b62c28c9d71fd78","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"0e62171df8ed4804d00db088f17eed06468233fa","versionType":"git"},{"version":"a3d43c0d56f1b94e74963a2fbadfb70126d92213","status":"affected","lessThan":"105425b1969c5affe532713cfac1c0b320d7ac2b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_taprio.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_taprio.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7"},{"url":"https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8"},{"url":"https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f"},{"url":"https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8"},{"url":"https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a"},{"url":"https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78"},{"url":"https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa"},{"url":"https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable taprio schedule switch is reached through local `NETLINK_ROUTE`/tc qdisc configuration, not by unauthenticated network packets. An attacker sends `RTM_NEWQDISC` messages to install and later switch taprio schedules.\nAC:L - The trigger is deterministic once the attacker installs an oper schedule and a later admin schedule with chosen base times/intervals. The attacker controls the schedule timing, so no condition beyond attacker control is required.\nPR:L - The rtnetlink qdisc path requires `CAP_NET_ADMIN` in the target network namespace. Because tc/qdisc configuration is reachable with namespaced `CAP_NET_ADMIN` via user namespaces in reasonable deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can issue the local netlink configuration. The hrtimer-driven schedule transition occurs automatically.\nS:U - The vulnerability corrupts kernel memory within the same kernel security authority. It is a standard local kernel privilege-escalation/DoS class issue, not a VM or hardware boundary escape.\nC:H - This is a use-after-free of taprio schedule entry memory that leaves `current_entry` pointing into freed objects. As a kernel UAF, it can plausibly be shaped into memory disclosure primitives.\nI:H - The stale schedule entry is later written and used by scheduler/dequeue paths, giving attacker-influenced heap corruption potential. Under the required kernel guidance, a UAF is high integrity impact because it can be leveraged for arbitrary write or control-flow compromise.\nA:H - The dangling schedule entry can be dereferenced after RCU freeing by the timer or dequeue path. Even without full exploitation, this can cause kernel oops, panic, or repeated crashes."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:32:38.643Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-53011","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:24:41.510503Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:47:13.860Z"}}]}}}