net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked multiq_dequeue() takes a packet from a band's child with a direct ->dequeue() call after multiq_peek() peeked it. When the child is non-work-conserving the peek stashes the skb in the child's gso_skb, so the direct dequeue returns a different skb and orphans the stash, desyncing the child's qlen/backlog. With a qfq child reached through a peeking parent (e.g. tbf) this re-enters the child on an emptied list and dereferences NULL, panicking the kernel from softirq on ordinary egress. Take the packet through qdisc_dequeue_peeked(), as sch_prio already does and as sch_red and sch_sfb were just fixed to do. The helper is a no-op when the child has no stash, so a work-conserving child is unaffected.
CVE-2026-72036
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-2026-72036
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": [
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "eb1a9637f0bd84b5db8803af65dfb1f44785406f",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "7a5a1582710981ef6637de9f074a60a5b1d63222",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "86a61e46a1919e8abf4d227c204773dabb24068a",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "1b9cc255e8089606b92b2adf504e334573682821",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "5889064919a1e5c0a9469c54895000414fc46944",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "fffeb2ab5eeb823d4c2330571a098f63237c9049",
"versionType": "git"
},
{
"status": "affected",
"version": "77be155cba4e163e8bba9fd27222a8b6189ec4f7",
"lessThan": "54f6b0c843e228d499eb4b6bbb89df68cad9ad5d",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_multiq.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_multiq.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72036
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41843 · Revision 1
- Added to Heist Feed
- Publisher date