lib: cpu_rmap: Avoid use after free on rmap->obj array entries
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: 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: lib: cpu_rmap: Avoid use after free on rmap->obj array entries When calling irq_set_affinity_notifier() with NULL at the notify argument, it will cause freeing of the glue pointer in the corresponding array entry but will leave the pointer in the array. A subsequent call to free_irq_cpu_rmap() will try to free this entry again leading to possible use after free. Fix that by setting NULL to the array entry and checking that we have non-zero at the array entry when iterating over the array in free_irq_cpu_rmap(). The current code does not suffer from this since there are no cases where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the notify arg) is called, followed by a call to free_irq_cpu_rmap() so we don't hit and issue. Subsequent patches in this series excersize this flow, hence the required fix.
Why it matters now
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 | 3.8 and later | 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4, 6.4 | Patch available | CNA |
- Linux VendorLinux Affected 3.8 and later Fixed in 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4, 6.4 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.8.1 to before 4.14.316; 4.15 to before 4.19.284; 4.20 to before 5.4.244; 5.5 to before 5.10.181; 5.11 to before 5.15.113; 5.16 to before 6.1.30; 6.2 to before 6.3.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:-:*:*:*:*:*:* | 3.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc4:*:*:*:*:*:* | 3.8 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc5:*:*:*:*:*:* | 3.8 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc6:*:*:*:*:*:* | 3.8 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc7:*:*:*:*:*:* | 3.8 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.8.1 to before 4.14.316; 4.15 to before 4.19.284; 4.20 to before 5.4.244; 5.5 to before 5.10.181; 5.11 to before 5.15.113; 5.16 to before 6.1.30; 6.2 to before 6.3.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:-:*:*:*:*:*:* Versions 3.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc4:*:*:*:*:*:* Versions 3.8 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc5:*:*:*:*:*:* Versions 3.8 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc6:*:*:*:*:*:* Versions 3.8 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc7:*:*:*:*:*:* Versions 3.8 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4, 6.4
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2023-53484
- 2026-10-03 Alias added: GHSA-9598-2w9x-r9v4
- 2026-10-16 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/981f339d2905b6a92ef59358158b326493aecac5
- https://git.kernel.org/stable/c/d1308bd0b24cb1d78fa2747d5fa3e055cc628a48
- https://git.kernel.org/stable/c/cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000
- https://git.kernel.org/stable/c/f748e15253833b771acbede14ea98f50831ac289
- https://git.kernel.org/stable/c/c6ed54dd90698dc0744d669524cc1c122ded8a16
- https://git.kernel.org/stable/c/c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4
- https://git.kernel.org/stable/c/67bca5f1d644f4e79b694abd8052a177de81c37f
- https://git.kernel.org/stable/c/4e0473f1060aa49621d40a113afde24818101d37
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2023-53484 · CVE Program
- CVE-2023-53484 · NVD
- FIRST EPSS
- GHSA-9598-2w9x-r9v4 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-53484 · Red Hat security data · CC BY 4.0
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