Strix
26.1K

CVE-2025-40083

UnknownEPSS 0.19%

Last modified

CVE-2025-40083 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.19%

8.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= 462dbc9101acd38e92eda93c0726857517a24bbd, < 71d84658a61322e5630c85c5388fc25e4a2d08b2; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 99fc137f178797204d36ac860dd8b31e35baa2df; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 1bed56f089f09b465420bf23bb32985c305cfc28; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 3c2a8994807623c7655ece205667ae2cf74940aa; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 6ffa9d66187188e3068b5a3895e6ae1ee34f9199; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 6ff8e74c8f8a68ec07ef837b95425dfe900d060f; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < dd831ac8221e691e9e918585b1003c7071df0379
LinuxLinux3.8

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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 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.
How severe is CVE-2025-40083?
Severity scoring for CVE-2025-40083 is pending analysis. The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40083?
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.

How Strix Helps

Related CVEs from 2025

View all 2025CVEs →

Are you affected by CVE-2025-40083?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST