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TI-2025-15869 Aliases CVE-2025-21919GHSA-c924-p67m-48hp

sched/fair: Fix potential memory corruption in child_cfs_rq_on_list

Priority LOW 36CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00237 14th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 5.15.179, 6.1.131, 6.6.83 +3Red Hat: 6 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.13 and later5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7, 6.14Patch availableCNA
  • Linux VendorLinux Affected 5.13 and later Fixed in 5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7, 6.14 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.13 to before 5.15.179; 5.16 to before 6.1.131; 6.2 to before 6.6.83; 6.7 to before 6.12.19; 6.13 to before 6.13.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*6.14 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*6.14 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*6.14 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*6.14 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*6.14 rc5VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.13 to before 5.15.179; 5.16 to before 6.1.131; 6.2 to before 6.6.83; 6.7 to before 6.12.19; 6.13 to before 6.13.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* Versions 6.14 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* Versions 6.14 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* Versions 6.14 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* Versions 6.14 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* Versions 6.14 rc5 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7, 6.14

Red Hat 6 advisories

  • RHSA-2025:14418 Released 2025-08-25 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.106.1.el8_8, kernel-4.18.0-477.106.1.el8_8, kernel-abi-stablelists-4.18.0-477.106.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.106.1.el8_8, kernel-4.18.0-477.106.1.el8_8, kernel-abi-stablelists-4.18.0-477.106.1.el8_8 +14
  • RHSA-2025:13776 Released 2025-08-13 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +14
  • RHSA-2025:11850 Released 2025-07-28 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.64.1.el8_10, kernel-4.18.0-553.64.1.el8_10, kernel-abi-stablelists-4.18.0-553.64.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.64.1.el8_10
Show 3 more Red Hat advisories
  • RHSA-2025:11851 Released 2025-07-28 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.64.1.rt7.405.el8_10, kernel-rt-core-4.18.0-553.64.1.rt7.405.el8_10, kernel-rt-debug-4.18.0-553.64.1.rt7.405.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.64.1.rt7.405.el8_10, kernel-rt-core-4.18.0-553.64.1.rt7.405.el8_10, kernel-rt-debug-4.18.0-553.64.1.rt7.405.el8_10 +7
  • RHSA-2025:9302 Released 2025-06-23 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.23.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.23.1.el9_6, kernel-64k-devel-5.14.0-570.23.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.23.1.el9_6, kernel-64k-5.14.0-570.23.1.el9_6, kernel-64k-core-5.14.0-570.23.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.23.1.el9_6, libperf-5.14.0-570.23.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.23.1.el9_6, kernel-rt-64k-5.14.0-570.23.1.el9_6, kernel-rt-64k-core-5.14.0-570.23.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.23.1.el9_6, kernel-rt-core-5.14.0-570.23.1.el9_6, kernel-rt-debug-5.14.0-570.23.1.el9_6 +11
  • RHSA-2025:8374 Released 2025-06-02 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.14.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.14.1.el10_0, kernel-64k-devel-6.12.0-55.14.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.14.1.el10_0, kernel-64k-6.12.0-55.14.1.el10_0, kernel-64k-core-6.12.0-55.14.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.14.1.el10_0, libperf-6.12.0-55.14.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.14.1.el10_0, kernel-rt-64k-6.12.0-55.14.1.el10_0, kernel-rt-64k-core-6.12.0-55.14.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.14.1.el10_0, kernel-rt-core-6.12.0-55.14.1.el10_0, kernel-rt-debug-6.12.0-55.14.1.el10_0 +11

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:8374
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:9302
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:8374
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2025:11850
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:9302
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2025:14418
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2025:14418
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:11850
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:8374
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:9302
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2025:11851
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2025:11851
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:8374
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:9302
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:8374
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:9302
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-21919
  2. 2026-10-03 Alias added: GHSA-c924-p67m-48hp
  3. 2026-10-29 Affected versions changed · Red Hat

References

Patch 6

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences