CVE-2025-40083 (GCVE-0-2025-40083)
Vulnerability from cvelistv5 – Published: 2025-10-29 13:37 – Updated: 2026-06-16 19:43
VLAI
EPSS
VEX
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.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:42 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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) |
guessed |
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},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40083\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T19:42:58.130867Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T19:43:04.499Z\"}}], \"cna\": {\"title\": \"net/sched: sch_qfq: Fix null-deref in agg_dequeue\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"71d84658a61322e5630c85c5388fc25e4a2d08b2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"99fc137f178797204d36ac860dd8b31e35baa2df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"1bed56f089f09b465420bf23bb32985c305cfc28\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"3c2a8994807623c7655ece205667ae2cf74940aa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"6ffa9d66187188e3068b5a3895e6ae1ee34f9199\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"6ff8e74c8f8a68ec07ef837b95425dfe900d060f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\", \"lessThan\": \"dd831ac8221e691e9e918585b1003c7071df0379\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/pkt_sched.h\", \"net/sched/sch_api.c\", \"net/sched/sch_hfsc.c\", \"net/sched/sch_qfq.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.302\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.197\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.116\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.57\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/pkt_sched.h\", \"net/sched/sch_api.c\", \"net/sched/sch_hfsc.c\", \"net/sched/sch_qfq.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2\"}, {\"url\": \"https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df\"}, {\"url\": \"https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28\"}, {\"url\": \"https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa\"}, {\"url\": \"https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199\"}, {\"url\": \"https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f\"}, {\"url\": \"https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.302\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.247\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.197\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.159\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.116\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.57\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16\", \"versionStartIncluding\": \"3.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:42:10.831Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-40083\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T19:43:09.432Z\", \"dateReserved\": \"2025-04-16T07:20:57.161Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-29T13:37:01.868Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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