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CVE-2026-72036

HIGHCVSS 7.8/10EPSS 0.21%

Last modified

CVE-2026-72036 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < eb1a9637f0bd84b5db8803af65dfb1f44785406f; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 7a5a1582710981ef6637de9f074a60a5b1d63222; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 86a61e46a1919e8abf4d227c204773dabb24068a; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 1b9cc255e8089606b92b2adf504e334573682821; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 5889064919a1e5c0a9469c54895000414fc46944; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < fffeb2ab5eeb823d4c2330571a098f63237c9049; >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7, < 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d
LinuxLinux2.6.29

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72036?
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.
How severe is CVE-2026-72036?
CVE-2026-72036 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72036?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST