CVE-2025-40083: linux

CVSS: UnknownDeferred
AliasesUBUNTU-CVE-2025-40083DEBIAN-CVE-2025-40083
Published 29-10-2025Last modified 16-06-2026
Open JSON

Vulnerability summary

CVE-2025-40083 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.21%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 38 · Related 36
DLA-4404-1DLA-4436-1OPENSUSE-SU-2025:20172-1SUSE-SU-2025:4393-1SUSE-SU-2025:4422-1SUSE-SU-2025:4505-1

Timeline

  1. 29-10-2025
    PublishedVulnerability first disclosed.
  2. 16-06-2026
    Last modifiedVulnerability information updated.

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 metrics

Risk metrics not yet published.

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.01 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu148 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-106.106
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1050.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.159-1 | < 6.12.57-1 | < 6.16.3-1
Linux1 product
  • linux≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 71d84658a61322e5630c85c5388fc25e4a2d08b2 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 99fc137f178797204d36ac860dd8b31e35baa2df | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 1bed56f089f09b465420bf23bb32985c305cfc28 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 3c2a8994807623c7655ece205667ae2cf74940aa | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 6ffa9d66187188e3068b5a3895e6ae1ee34f9199 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 6ff8e74c8f8a68ec07ef837b95425dfe900d060f | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < dd831ac8221e691e9e918585b1003c7071df0379 | 3.8

3 vendors · 150 products

References

32 links
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