Skip to content
Heist/ feed
High

sched/fair: Fix potential memory corruption in child_cfs_rq_on_list

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-21919

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-21919

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2025-21919

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26969 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement