CVE-2025-40083
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…
Does this matter?
Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published.
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.
- CVSS
- Not yet scored
- EPSS
- 0.19% probability · 9th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28
- https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa
- https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f
- https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199
- https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2
- https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df
- https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.