{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53011", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.378Z", "datePublished": "2026-06-24T16:29:22.082Z", "dateUpdated": "2026-08-05T12:32:38.643Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:38.643Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/sch_taprio.c" ], "versions": [ { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "a8fc396519ef4f081bc545e88f61241728bb78d7", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "3471874578160a28c171a607fa069f24062634b8", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "7256996e1ef553716817f3bfd077c2f3b48b582f", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "eee072fe16c646190d33ae69c9983d8de1562bf8", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "1bd286fa3e21200133478ed523cc6a2788baf38a", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "b73235da5dde77ed1264f9767b62c28c9d71fd78", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "0e62171df8ed4804d00db088f17eed06468233fa", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "105425b1969c5affe532713cfac1c0b320d7ac2b", "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/sch_taprio.c" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.2", "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" } ] } ] } ], "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" } ], "title": "net/sched: taprio: fix use-after-free in advance_sched() on schedule switch", "x_generator": { "engine": "bippy-1.2.0" } } } }