net/sched: taprio: fix use-after-free in advance_sched() on schedule switch
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.
CVE-2026-53011
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53011
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "a8fc396519ef4f081bc545e88f61241728bb78d7",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "3471874578160a28c171a607fa069f24062634b8",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "7256996e1ef553716817f3bfd077c2f3b48b582f",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "eee072fe16c646190d33ae69c9983d8de1562bf8",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "1bd286fa3e21200133478ed523cc6a2788baf38a",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "b73235da5dde77ed1264f9767b62c28c9d71fd78",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "0e62171df8ed4804d00db088f17eed06468233fa",
"versionType": "git"
},
{
"status": "affected",
"version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
"lessThan": "105425b1969c5affe532713cfac1c0b320d7ac2b",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_taprio.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_taprio.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53011
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40734 · Revision 1
- Added to Heist Feed
- Publisher date