CVE-2025-40083net/sched: sch_qfq: Fix null-deref in agg_dequeue
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix null-deref in agg_dequeue To prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c) when cl->qdisc->ops->peek(cl->qdisc) returns NULL, we check the return value before using it, similar to the existing approach in sch_hfsc.c. To avoid code duplication, the following changes are made: 1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static inline function. 2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to include/net/pkt_sched.h so that sch_qfq can reuse it. 3. Applied qdisc_peek_len in agg_dequeue to avoid crashing.
Timeline
ID reserved
By Linux
- 7 months later
· 7 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 71d84658a61322e5630c85c5388fc25e4a2d08b2
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 99fc137f178797204d36ac860dd8b31e35baa2df
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 1bed56f089f09b465420bf23bb32985c305cfc28
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 3c2a8994807623c7655ece205667ae2cf74940aa
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 6ffa9d66187188e3068b5a3895e6ae1ee34f9199
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < 6ff8e74c8f8a68ec07ef837b95425dfe900d060f
- affected 462dbc9101acd38e92eda93c0726857517a24bbd – < dd831ac8221e691e9e918585b1003c7071df0379
- affected 3.8
- unaffected < 3.8
- unaffected 5.4.302 – ≤ 5.4.*
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.116 – ≤ 6.6.*
- unaffected 6.12.57 – ≤ 6.12.*
- unaffected 6.16 – ≤ *
References
References7
- https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2 (opens in a new tab)
- https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df (opens in a new tab)
- https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28 (opens in a new tab)
- https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa (opens in a new tab)
- https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199 (opens in a new tab)
- https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f (opens in a new tab)
- https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-36665 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40083)Record last updated .