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CVE-2025-21919 (GCVE-0-2025-21919)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-09-08 08:40
VLAI
Title
sched/fair: Fix potential memory corruption in child_cfs_rq_on_list
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fix potential memory corruption in child_cfs_rq_on_list child_cfs_rq_on_list attempts to convert a 'prev' pointer to a cfs_rq. This 'prev' pointer can originate from struct rq's leaf_cfs_rq_list, making the conversion invalid and potentially leading to memory corruption. Depending on the relative positions of leaf_cfs_rq_list and the task group (tg) pointer within the struct, this can cause a memory fault or access garbage data. The issue arises in list_add_leaf_cfs_rq, where both cfs_rq->leaf_cfs_rq_list and rq->leaf_cfs_rq_list are added to the same leaf list. Also, rq->tmp_alone_branch can be set to rq->leaf_cfs_rq_list. This adds a check `if (prev == &rq->leaf_cfs_rq_list)` after the main conditional in child_cfs_rq_on_list. This ensures that the container_of operation will convert a correct cfs_rq struct. This check is sufficient because only cfs_rqs on the same CPU are added to the list, so verifying the 'prev' pointer against the current rq's list head is enough. Fixes a potential memory corruption issue that due to current struct layout might not be manifesting as a crash but could lead to unpredictable behavior when the layout changes.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:23 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < 5cb300dcdd27e6a351ac02541e0231261c775852 (git)
Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < 000c9ee43928f2ce68a156dd40bab7616256f4dd (git)
Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < 9cc7f0018609f75a349e42e3aebc3b0e905ba775 (git)
Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < b5741e4b9ef3567613b2351384f91d3f16e59986 (git)
Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < e1dd09df30ba86716cb2ffab97dc35195c01eb8f (git)
Affected: fdaba61ef8a268d4136d0a113d153f7a89eb9984 , < 3b4035ddbfc8e4521f85569998a7569668cccf51 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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Also, rq-\u003etmp_alone_branch can be set to rq-\u003eleaf_cfs_rq_list.\\n\\nThis adds a check `if (prev == \u0026rq-\u003eleaf_cfs_rq_list)` after the main\\nconditional in child_cfs_rq_on_list. This ensures that the container_of\\noperation will convert a correct cfs_rq struct.\\n\\nThis check is sufficient because only cfs_rqs on the same CPU are added\\nto the list, so verifying the \u0027prev\u0027 pointer against the current rq\u0027s list\\nhead is enough.\\n\\nFixes a potential memory corruption issue that due to current struct\\nlayout might not be manifesting as a crash but could lead to unpredictable\\nbehavior when the layout changes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/fair: Se corrige la posible corrupci\u00f3n de memoria en child_cfs_rq_on_list. child_cfs_rq_on_list intenta convertir un puntero \u0027prev\u0027 en un cfs_rq. 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Esta comprobaci\u00f3n es suficiente porque solo se a\u00f1aden a la lista las cfs_rqs en la misma CPU, por lo que basta con verificar el puntero `prev` con la cabecera de la lista de la rq actual. Corrige un posible problema de corrupci\u00f3n de memoria que, debido al dise\u00f1o actual de la estructura, podr\u00eda no manifestarse como un fallo, pero podr\u00eda provocar un comportamiento impredecible al cambiar el 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:05:25+00:00",
      "cve": "CVE-2025-21919",
      "id": "CVE-2025-21919",
      "initial_release_date": "2025-04-01T00:00:00+00:00",
      "product_status:fixed": "980",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/fair: Fix potential memory corruption in child_cfs_rq_on_list",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21919.json",
      "version": "3"
    },
    "vulnrichment": {
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Exploitation requires the ability to run code on the machine.\\nAC:L - The invalid `container_of()` executes deterministically every time the examined cfs_rq is first on `rq-\u003eleaf_cfs_rq_list` or `rq-\u003etmp_alone_branch` is at its reset value, which is the normal steady state \\u2014 no race to win and no unusual precondition. An attacker reliably drives it by creating/loading a cgroup in a delegated subtree and letting the load balancer or bandwidth timer run.\\nPR:L - No capability check, credential test, or privileged gate exists on `__update_blocked_fair()` or `tg_unthrottle_up()`; an ordinary unprivileged user reaches both via normal task execution and via cgroup v2 cpu/cpu.max controls in a systemd- or container-delegated subtree. Real root in the init namespace is not needed.\\nUI:N - The vulnerable path runs from the periodic load-balance softirq and the CFS bandwidth timer, with no victim action of any kind required. The attacker\u0027s own workload is sufficient to trigger it.\\nS:U - The bogus pointer arithmetic, out-of-bounds read, and any resulting fault all occur within the kernel\u0027s own security authority on the same host. No VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The type-confused `struct task_group *` is dereferenced at `offsetof(task_group, parent)` from a `list_head` address, which reads out of bounds past the end of the `cfs_rq` slab object into adjacent heap memory whose contents an attacker can influence via heap grooming. This is an unbounded kernel-memory read at an offset determined by struct layout rather than by any bounds check.\\nI:H - This is a genuine type confusion \\u2014 a `struct rq` list head reinterpreted as a member of `struct cfs_rq`, yielding a fabricated object pointer that is dereferenced \\u2014 which upstream explicitly characterizes as \\\"potential memory corruption.\\\" Under differing struct layouts the fabricated `tg` pointer is an arbitrary non-pointer value, so the corrupted access is not confined to a benign read.\\nA:H - The commit states the invalid conversion \\\"can cause a memory fault or access garbage data\\\"; dereferencing a wild `tg` pointer inside the scheduler with the rq lock held produces an oops or panic, and the slab-out-of-bounds read triggers a KASAN report that panics on hardened configurations. A fault in `__update_blocked_fair()` under the runqueue lock is unrecoverable for the affected CPU.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"5cb300dcdd27e6a351ac02541e0231261c775852\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"000c9ee43928f2ce68a156dd40bab7616256f4dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"9cc7f0018609f75a349e42e3aebc3b0e905ba775\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"b5741e4b9ef3567613b2351384f91d3f16e59986\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"e1dd09df30ba86716cb2ffab97dc35195c01eb8f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fdaba61ef8a268d4136d0a113d153f7a89eb9984\", \"lessThan\": \"3b4035ddbfc8e4521f85569998a7569668cccf51\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.179\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.131\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852\"}, {\"url\": \"https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd\"}, {\"url\": \"https://git.kernel.org/stable/c/9cc7f0018609f75a349e42e3aebc3b0e905ba775\"}, {\"url\": \"https://git.kernel.org/stable/c/b5741e4b9ef3567613b2351384f91d3f16e59986\"}, {\"url\": \"https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f\"}, {\"url\": \"https://git.kernel.org/stable/c/3b4035ddbfc8e4521f85569998a7569668cccf51\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/fair: Fix potential memory corruption in child_cfs_rq_on_list\\n\\nchild_cfs_rq_on_list attempts to convert a \u0027prev\u0027 pointer to a cfs_rq.\\nThis \u0027prev\u0027 pointer can originate from struct rq\u0027s leaf_cfs_rq_list,\\nmaking the conversion invalid and potentially leading to memory\\ncorruption. Depending on the relative positions of leaf_cfs_rq_list and\\nthe task group (tg) pointer within the struct, this can cause a memory\\nfault or access garbage data.\\n\\nThe issue arises in list_add_leaf_cfs_rq, where both\\ncfs_rq-\u003eleaf_cfs_rq_list and rq-\u003eleaf_cfs_rq_list are added to the same\\nleaf list. Also, rq-\u003etmp_alone_branch can be set to rq-\u003eleaf_cfs_rq_list.\\n\\nThis adds a check `if (prev == \u0026rq-\u003eleaf_cfs_rq_list)` after the main\\nconditional in child_cfs_rq_on_list. This ensures that the container_of\\noperation will convert a correct cfs_rq struct.\\n\\nThis check is sufficient because only cfs_rqs on the same CPU are added\\nto the list, so verifying the \u0027prev\u0027 pointer against the current rq\u0027s list\\nhead is enough.\\n\\nFixes a potential memory corruption issue that due to current struct\\nlayout might not be manifesting as a crash but could lead to unpredictable\\nbehavior when the layout changes.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.131\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.83\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.19\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.7\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"5.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:55:20.805Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21919\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:40:56.687Z\", \"dateReserved\": \"2024-12-29T08:45:45.787Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-01T15:40:54.075Z\", \"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.


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.