net/sched: taprio: fix use-after-free in advance_sched() on schedule switch

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53011
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:12 UTC
Updated2026-07-14 18:24:16 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001250000 probability, percentile 0.026170000 (date 2026-07-13)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 a8fc396519ef4f081bc545e88f61241728bb78d7 git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 3471874578160a28c171a607fa069f24062634b8 git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 7256996e1ef553716817f3bfd077c2f3b48b582f git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 eee072fe16c646190d33ae69c9983d8de1562bf8 git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 1bd286fa3e21200133478ed523cc6a2788baf38a git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 b73235da5dde77ed1264f9767b62c28c9d71fd78 git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 0e62171df8ed4804d00db088f17eed06468233fa git Not specified
CNA Linux Linux affected a3d43c0d56f1b94e74963a2fbadfb70126d92213 105425b1969c5affe532713cfac1c0b320d7ac2b git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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