net/sched: sch_qfq: Fix race condition on qfq_aggregate
Priority LOW 33CWE-362Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 13 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00141 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.297, 5.10.241, 5.15.190 +5Red Hat: 7 advisoriesRed Hat: 13 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.8 and later | 5.4.297, 5.10.241, 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.8, 6.16 | Patch available | CNA |
- Linux VendorLinux Affected 3.8 and later Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.8, 6.16 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.8 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.147; 6.2 to before 6.6.100; 6.7 to before 6.12.40; 6.13 to before 6.15.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:* | 6.16 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:* | 6.16 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:* | 6.16 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:* | 6.16 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:* | 6.16 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:* | 6.16 rc6 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.8 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.147; 6.2 to before 6.6.100; 6.7 to before 6.12.40; 6.13 to before 6.15.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:* Versions 6.16 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:* Versions 6.16 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:* Versions 6.16 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:* Versions 6.16 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:* Versions 6.16 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:* Versions 6.16 rc6 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.8, 6.16
Red Hat 7 advisories
- RHSA-2025:22752 Released 2025-12-04 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.179.1.el8_4, kernel-4.18.0-305.179.1.el8_4, kernel-abi-stablelists-4.18.0-305.179.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.179.1.el8_4, kernel-4.18.0-305.179.1.el8_4, kernel-abi-stablelists-4.18.0-305.179.1.el8_4 +14
- RHSA-2025:21667 Released 2025-11-18 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.173.1.el8_2, kernel-4.18.0-193.173.1.el8_2, kernel-abi-whitelists-4.18.0-193.173.1.el8_2 +14
- RHSA-2025:17161 Released 2025-10-01 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.141.1.el7, kernel-3.10.0-1160.141.1.el7, kernel-abi-whitelists-3.10.0-1160.141.1.el7 +11
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.141.1.el7, kernel-tools-libs-devel-3.10.0-1160.141.1.el7
Show 4 more Red Hat advisories
- RHSA-2025:17124 Released 2025-10-01 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.162.1.el8_6, kernel-4.18.0-372.162.1.el8_6, kernel-abi-stablelists-4.18.0-372.162.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.162.1.el8_6, kernel-4.18.0-372.162.1.el8_6, kernel-abi-stablelists-4.18.0-372.162.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.162.1.el8_6, kernel-4.18.0-372.162.1.el8_6, kernel-abi-stablelists-4.18.0-372.162.1.el8_6 +14
- RHSA-2025:17109 Released 2025-09-30 · Red Hat rating Moderatekernel-rt security update
- Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.140.1.rt56.1292.el7, kernel-rt-debug-3.10.0-1160.140.1.rt56.1292.el7, kernel-rt-debug-devel-3.10.0-1160.140.1.rt56.1292.el7 +4
- RHSA-2025:17009 Released 2025-09-30 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.112.1.el8_8, kernel-4.18.0-477.112.1.el8_8, kernel-abi-stablelists-4.18.0-477.112.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.112.1.el8_8, kernel-4.18.0-477.112.1.el8_8, kernel-abi-stablelists-4.18.0-477.112.1.el8_8 +14
- RHSA-2025:15008 Released 2025-09-02 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.72.1.el8_10, kernel-4.18.0-553.72.1.el8_10, kernel-abi-stablelists-4.18.0-553.72.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.72.1.el8_10
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:15008 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:21667 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:22752 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2025:17124 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2025:17124 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:17009 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:22752 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2025:17124 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:17009 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:15008 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2025:17161 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2025:17161 |
| Red Hat Enterprise Linux for Real Time (v. 7 ELS) | Fixed | RHSA-2025:17109 |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38477
- 2026-10-03 Alias added: GHSA-79vc-v8qm-8x53
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-23 CVSS score changed · Red Hat
- 2026-10-31 Affected versions changed · Red Hat
References
Patch 8
- https://git.kernel.org/stable/c/aa7a22c4d678bf649fd3a1d27debec583563414d
- https://git.kernel.org/stable/c/d841aa5518508ab195b6781ad0d73ee378d713dd
- https://git.kernel.org/stable/c/c6df794000147a3a02f79984aada4ce83f8d0a1e
- https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6
- https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527
- https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1
- https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79
- https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64
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Sources
- CVE-2025-38477 · CVE Program
- CVE-2025-38477 · NVD
- FIRST EPSS
- GHSA-79vc-v8qm-8x53 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38477 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences