ftrace: Avoid potential division by zero in function_stat_show()
Priority LOW 24CWE-369Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-369.
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Avoid potential division by zero in function_stat_show() Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00233 14th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.291, 3.17, 4.5 +10Red Hat: 4 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 | 5.4.9 to before 5.4.291; 3.16.83 to before 3.17; 4.4.209 to before 4.5; 4.9.209 to before 4.10; 4.14.163 to before 4.15; 4.19.94 to before 4.20 | 5.4.291, 3.17, 4.5, 4.10, 4.15, 4.20 | Patch available | CNA |
| Linux | Linux | 5.5 and later | 5.4.291, 5.10.235, 5.15.179, 6.1.130, 6.6.81, 6.12.18, 6.13.6, 6.14 | Patch available | CNA |
- Linux VendorLinux Affected 5.4.9 to before 5.4.291; 3.16.83 to before 3.17; 4.4.209 to before 4.5; 4.9.209 to before 4.10; 4.14.163 to before 4.15; 4.19.94 to before 4.20 Fixed in 5.4.291, 3.17, 4.5, 4.10, 4.15, 4.20 Patch available CNA
- Linux VendorLinux Affected 5.5 and later Fixed in 5.4.291, 5.10.235, 5.15.179, 6.1.130, 6.6.81, 6.12.18, 6.13.6, 6.14 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.16.83 to before 3.17; 4.4.206 to before 4.5; 4.9.209 to before 4.10; 4.14.163 to before 4.15; 4.19.94 to before 4.20; 5.4.9 to before 5.4.291; 5.5 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.130; 6.2 to before 6.6.81; 6.7 to before 6.12.18; 6.13 to before 6.13.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* | 6.14 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* | 6.14 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* | 6.14 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* | 6.14 rc4 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.16.83 to before 3.17; 4.4.206 to before 4.5; 4.9.209 to before 4.10; 4.14.163 to before 4.15; 4.19.94 to before 4.20; 5.4.9 to before 5.4.291; 5.5 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.130; 6.2 to before 6.6.81; 6.7 to before 6.12.18; 6.13 to before 6.13.6 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
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.291, 3.17, 4.5, 4.10, 4.15, 4.20
- Fix · CNA Linux (Linux) Fixed in 5.4.291, 5.10.235, 5.15.179, 6.1.130, 6.6.81, 6.12.18, 6.13.6, 6.14
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2025-21898
- 2026-10-03 Alias added: GHSA-cjrr-3f69-p92j
References
Patch 8
- https://git.kernel.org/stable/c/5b3d32f607f0478b414b16516cf27f9170cf66c8
- https://git.kernel.org/stable/c/ca381f60a3bb7cfaa618d73ca411610bd7fc3149
- https://git.kernel.org/stable/c/3d738b53ed6cddb68e68c9874520a4bf846163b5
- https://git.kernel.org/stable/c/992775227843c9376773784b8b362add44592ad7
- https://git.kernel.org/stable/c/f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3
- https://git.kernel.org/stable/c/746cc474a95473591853927b3a9792a2d671155b
- https://git.kernel.org/stable/c/9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6
- https://git.kernel.org/stable/c/a1a7eb89ca0b89dc1c326eeee2596f263291aca3
More Linux Kernel vulnerabilities
- 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
Sources
- CVE-2025-21898 · CVE Program
- CVE-2025-21898 · NVD
- FIRST EPSS
- GHSA-cjrr-3f69-p92j · GitHub Advisory Database · CC BY 4.0
- CVE-2025-21898 · Red Hat security data · CC BY 4.0
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