net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too
Priority LOW 35CWE-416Published · 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
- Partial Red Hat: 26 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too Similarly to the previous patch, we need to safe guard hfsc_dequeue() too. But for this one, we don't have a reliable reproducer.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00229 13th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.293, 5.10.237, 5.15.181 +5Red Hat: 9 advisoriesRed Hat: 26 fixed, 3 without a fix
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.12 and later | 5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5, 6.15 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.12 and later Fixed in 5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5, 6.15 Patch available CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 2.6.13 to before 5.4.293; 5.5 to before 5.10.237; 5.11 to before 5.15.181; 5.16 to before 6.1.136; 6.2 to before 6.6.89; 6.7 to before 6.12.26; 6.13 to before 6.14.5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* | 2.6.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* | 2.6.12 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* | 2.6.12 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* | 2.6.12 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* | 2.6.12 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* | 6.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* | 6.15 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:* | 6.15 rc3 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.13 to before 5.4.293; 5.5 to before 5.10.237; 5.11 to before 5.15.181; 5.16 to before 6.1.136; 6.2 to before 6.6.89; 6.7 to before 6.12.26; 6.13 to before 6.14.5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* Versions 2.6.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* Versions 2.6.12 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* Versions 2.6.12 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* Versions 2.6.12 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* Versions 2.6.12 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* Versions 6.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* Versions 6.15 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:* Versions 6.15 rc3 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5, 6.15
Red Hat 9 advisories
- RHSA-2026:0755 Released 2026-01-19 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.145.1.el7, kernel-3.10.0-1160.145.1.el7, kernel-abi-whitelists-3.10.0-1160.145.1.el7 +11
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.145.1.el7, kernel-tools-libs-devel-3.10.0-1160.145.1.el7
- RHSA-2026:0754 Released 2026-01-19 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.145.1.rt56.1297.el7, kernel-rt-debug-3.10.0-1160.145.1.rt56.1297.el7, kernel-rt-debug-devel-3.10.0-1160.145.1.rt56.1297.el7 +4
- RHSA-2025:18098 Released 2025-10-15 · Red Hat rating Moderatekernel-rt security update
- Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-core-5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-5.14.0-70.149.1.rt21.221.el9_0 +9
- Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-core-5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-5.14.0-70.149.1.rt21.221.el9_0 +7
Show 6 more Red Hat advisories
- RHSA-2025:18054 Released 2025-10-15 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.149.1.el9_0, kernel-debug-devel-matched-5.14.0-70.149.1.el9_0, kernel-devel-5.14.0-70.149.1.el9_0 +5
- Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.149.1.el9_0, kernel-5.14.0-70.149.1.el9_0, kernel-abi-stablelists-5.14.0-70.149.1.el9_0 +14
- RHSA-2025:17734 Released 2025-10-13 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.142.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.142.1.el9_2, kernel-64k-devel-5.14.0-284.142.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.142.1.el9_2, kernel-5.14.0-284.142.1.el9_2, kernel-64k-5.14.0-284.142.1.el9_2 +29
- RHSA-2025:17241 Released 2025-10-02 · Red Hat rating Moderatekernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.92.1.el9_4, libperf-5.14.0-427.92.1.el9_4
- Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.92.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.92.1.el9_4, kernel-64k-devel-5.14.0-427.92.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.92.1.el9_4, kernel-5.14.0-427.92.1.el9_4, kernel-64k-5.14.0-427.92.1.el9_4 +29
- Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.92.1.el9_4, kernel-rt-core-5.14.0-427.92.1.el9_4, kernel-rt-debug-5.14.0-427.92.1.el9_4 +9
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.92.1.el9_4, kernel-rt-core-5.14.0-427.92.1.el9_4, kernel-rt-debug-5.14.0-427.92.1.el9_4 +11
- RHSA-2025:16919 Released 2025-09-29 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.77.1.el8_10, kernel-4.18.0-553.77.1.el8_10, kernel-abi-stablelists-4.18.0-553.77.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.77.1.el8_10
- RHSA-2025:15011 Released 2025-09-02 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.39.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.39.1.el9_6, kernel-64k-devel-5.14.0-570.39.1.el9_6 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.39.1.el9_6, kernel-64k-5.14.0-570.39.1.el9_6, kernel-64k-core-5.14.0-570.39.1.el9_6 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.39.1.el9_6, libperf-5.14.0-570.39.1.el9_6
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.39.1.el9_6, kernel-rt-64k-5.14.0-570.39.1.el9_6, kernel-rt-64k-core-5.14.0-570.39.1.el9_6 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.39.1.el9_6, kernel-rt-core-5.14.0-570.39.1.el9_6, kernel-rt-debug-5.14.0-570.39.1.el9_6 +11
- RHSA-2025:15005 Released 2025-09-02 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.30.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.30.1.el10_0, kernel-64k-devel-6.12.0-55.30.1.el10_0 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.30.1.el10_0, kernel-64k-6.12.0-55.30.1.el10_0, kernel-64k-core-6.12.0-55.30.1.el10_0 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.30.1.el10_0, libperf-6.12.0-55.30.1.el10_0
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.30.1.el10_0, kernel-rt-64k-6.12.0-55.30.1.el10_0, kernel-rt-64k-core-6.12.0-55.30.1.el10_0 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.30.1.el10_0, kernel-rt-core-6.12.0-55.30.1.el10_0, kernel-rt-debug-6.12.0-55.30.1.el10_0 +11
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 yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.4) | Fixed | RHSA-2025:17241 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:15005 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:15011 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:18054 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2025:17734 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:17241 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2025:15005 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:16919 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2025:15011 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:18054 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2025:17734 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:17241 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:16919 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2025:15005 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2025:15011 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2025:18098 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2025:15005 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2025:15011 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2025:18098 |
| Red Hat Enterprise Linux Real Time EUS (v.9.4) | Fixed | RHSA-2025:17241 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2025:15005 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2025:15011 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) | Fixed | RHSA-2025:17241 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:0755 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:0755 |
| Red Hat Enterprise Linux for Real Time (v. 7 ELS) | Fixed | RHSA-2026:0754 |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-37823
- 2026-10-03 Alias added: GHSA-gr82-7xxj-rqx8
- 2026-10-16 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/68f256305ceb426d545a0dc31f83c2ab1d211a1e
- https://git.kernel.org/stable/c/2f46d14919c39528c6e540ebc43f90055993eedc
- https://git.kernel.org/stable/c/da7936518996d290e2fcfcaf6cd7e15bfd87804a
- https://git.kernel.org/stable/c/11bccb054c1462fb069219f8e98e97a5a730758e
- https://git.kernel.org/stable/c/76c4c22c2437d3d3880efc0f62eca06ef078d290
- https://git.kernel.org/stable/c/c6f035044104c6ff656f4565cd22938dc892528c
- https://git.kernel.org/stable/c/c6936266f8bf98a53f28ef9a820e6a501e946d09
- https://git.kernel.org/stable/c/6ccbda44e2cc3d26fd22af54c650d6d5d801addf
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Sources
- CVE-2025-37823 · CVE Program
- CVE-2025-37823 · NVD
- FIRST EPSS
- GHSA-gr82-7xxj-rqx8 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-37823 · Red Hat security data · CC BY 4.0
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