CVE-2026-53011net/sched: taprio: fix use-after-free in advance_sched() on schedule switch
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: fix use-after-free in advance_sched() on schedule switch In advance_sched(), when should_change_schedules() returns true, switch_schedules() is called to promote the admin schedule to oper. switch_schedules() queues the old oper schedule for RCU freeing via call_rcu(), but 'next' still points into an entry of the old oper schedule. The subsequent 'next->end_time = end_time' and rcu_assign_pointer(q->current_entry, next) are use-after-free. Fix this by selecting 'next' from the new oper schedule immediately after switch_schedules(), and using its pre-calculated end_time. setup_first_end_time() sets the first entry's end_time to base_time + interval when the schedule is installed, so the value is already correct. The deleted 'end_time = sched_base_time(admin)' assignment was also harmful independently: it would overwrite the new first entry's pre-calculated end_time with just base_time.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before a8fc396519ef4f081bc545e88f61241728bb78d7; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before 3471874578160a28c171a607fa069f24062634b8; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before 7256996e1ef553716817f3bfd077c2f3b48b582f; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before eee072fe16c646190d33ae69c9983d8de1562bf8; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before 1bd286fa3e21200133478ed523cc6a2788baf38a; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before b73235da5dde77ed1264f9767b62c28c9d71fd78; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before 0e62171df8ed4804d00db088f17eed06468233fa; from a3d43c0d56f1b94e74963a2fbadfb70126d92213 before 105425b1969c5affe532713cfac1c0b320d7ac2b | CNA record |
linux linux_kernel linux:linux_kernel | from 5.2 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10 | NVD |
References
- https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7patch
- https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8patch
- https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582fpatch
- https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8patch
- https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38apatch
- https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78patch
- https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fapatch
- https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2bpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.