CVE-2025-38177 (GCVE-0-2025-38177)

Vulnerability from cvelistv5 – Published: 2025-07-04 12:47 – Updated: 2026-06-11 18:44
VLAI
Title
sch_hfsc: make hfsc_qlen_notify() idempotent
Summary
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7 (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < a5efc95a33bd4fcb879250852828cc58c7862970 (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < 9030a91235ae4845ec71902c3e0cecfc9ed1f2df (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < d06476714d2819b550e0cc39222347e2c8941c9d (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < c1175c4ad01dbc9c979d099861fa90a754f72059 (git)
Affected: 959466588aa7f84ccf79ae36a1d89542eaf9aaec , < 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.138 , ≤ 6.1.* (semver)
Unaffected: 6.6.90 , ≤ 6.6.* (semver)
Unaffected: 6.12.28 , ≤ 6.12.* (semver)
Unaffected: 6.14.6 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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Let\u0027s make it idempotent\\nto ease qdisc_tree_reduce_backlog() callers\u0027 life:\\n\\n1. update_vf() decreases cl-\u003ecl_nactive, so we can check whether it is\\nnon-zero before calling it.\\n\\n2. eltree_remove() always removes RB node cl-\u003eel_node, but we can use\\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sch_hfsc: hace que hfsc_qlen_notify() sea idempotente. hfsc_qlen_notify() tampoco es idempotente y no es compatible con quienes lo llaman, como fq_codel_dequeue(). Vamos a convertirlo en idempotente para simplificar la tarea de quienes llaman a qdisc_tree_reduce_backlog(): 1. update_vf() reduce cl-\u0026gt;cl_nactive, lo que permite comprobar si es distinto de cero antes de llamarlo. 2. eltree_remove() siempre elimina el nodo RB cl-\u0026gt;el_node, pero podemos usar RB_EMPTY_NODE() + RB_CLEAR_NODE() para hacerlo 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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T19:58:30.487Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-38177\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:40:35.261574Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:37:27.468Z\"}}], \"cna\": {\"title\": \"sch_hfsc: make hfsc_qlen_notify() idempotent\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"9a5fd5c2f4d4afdd5e405083ee53e0789ce76956\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"a5efc95a33bd4fcb879250852828cc58c7862970\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"9030a91235ae4845ec71902c3e0cecfc9ed1f2df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"d06476714d2819b550e0cc39222347e2c8941c9d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"c1175c4ad01dbc9c979d099861fa90a754f72059\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"959466588aa7f84ccf79ae36a1d89542eaf9aaec\", \"lessThan\": \"51eb3b65544c9efd6a1026889ee5fb5aa62da3bb\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/sch_hfsc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.297\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.241\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.190\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.138\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.90\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.28\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_hfsc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956\"}, {\"url\": \"https://git.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7\"}, {\"url\": \"https://git.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970\"}, {\"url\": \"https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87\"}, {\"url\": \"https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df\"}, {\"url\": \"https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d\"}, {\"url\": \"https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059\"}, {\"url\": \"https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsch_hfsc: make hfsc_qlen_notify() idempotent\\n\\nhfsc_qlen_notify() is not idempotent either and not friendly\\nto its callers, like fq_codel_dequeue(). Let\u0027s make it idempotent\\nto ease qdisc_tree_reduce_backlog() callers\u0027 life:\\n\\n1. update_vf() decreases cl-\u003ecl_nactive, so we can check whether it is\\nnon-zero before calling it.\\n\\n2. eltree_remove() always removes RB node cl-\u003eel_node, but we can use\\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.297\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.241\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.190\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.138\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.90\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.28\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.6\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"4.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:22:45.291Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38177\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:03.284Z\", \"dateReserved\": \"2025-04-16T04:51:23.992Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-07-04T12:47:09.127Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





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.