CVE-2026-53011

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-53011

Key Details

CVE	CVE-2026-53011
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-416 (Use After Free)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53011
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53011

Source

Reference

NVD

CVE