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

Vulnerability from cvelistv5 – Published: 2025-10-29 13:37 – Updated: 2026-06-16 19:43
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.
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
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
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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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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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.