CVE-2025-40083 (GCVE-0-2025-40083)

Vulnerability from cvelistv5 – Published: 2025-10-29 13:37 – Updated: 2026-01-02 15:32
VLAI?
Title
net/sched: sch_qfq: Fix null-deref in agg_dequeue
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 71d84658a61322e5630c85c5388fc25e4a2d08b2 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 99fc137f178797204d36ac860dd8b31e35baa2df (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 1bed56f089f09b465420bf23bb32985c305cfc28 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 3c2a8994807623c7655ece205667ae2cf74940aa (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 6ffa9d66187188e3068b5a3895e6ae1ee34f9199 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 6ff8e74c8f8a68ec07ef837b95425dfe900d060f (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < dd831ac8221e691e9e918585b1003c7071df0379 (git)
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    Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.116 , ≤ 6.6.* (semver)
Unaffected: 6.12.57 , ≤ 6.12.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix null-deref in agg_dequeue\n\nTo prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c)\nwhen cl-\u003eqdisc-\u003eops-\u003epeek(cl-\u003eqdisc) returns NULL, we check the return\nvalue before using it, similar to the existing approach in sch_hfsc.c.\n\nTo avoid code duplication, the following changes are made:\n\n1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static\ninline function.\n\n2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to\ninclude/net/pkt_sched.h so that sch_qfq can reuse it.\n\n3. Applied qdisc_peek_len in agg_dequeue to avoid crashing."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-01-02T15:32:57.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2025-04-16T07:20:57.161Z",
    "dateUpdated": "2026-01-02T15:32:57.767Z",
    "state": "PUBLISHED"
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}


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