bus: fsl-mc: fix use-after-free in driver_override_show()
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: 1 without a fix
Attack profile from CVSS 3.1 · NVD. 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: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10 and later | 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.11, 6.19.1, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 5.10 and later Fixed in 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.11, 6.19.1, 7.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.10 to before 5.15.201; 5.16 to before 6.1.164; 6.2 to before 6.6.127; 6.7 to before 6.12.74; 6.13 to before 6.18.11; 6.19 to before 6.19.1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.10 to before 5.15.201; 5.16 to before 6.1.164; 6.2 to before 6.6.127; 6.7 to before 6.12.74; 6.13 to before 6.18.11; 6.19 to before 6.19.1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.11, 6.19.1, 7.0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23221
- 2026-10-03 Alias added: GHSA-jp99-8xc8-367m
References
Patch 7
- https://git.kernel.org/stable/c/c71dfb7833db7af652ee8f65011f14c97c47405d
- https://git.kernel.org/stable/c/c424e72cfa67e7e1477035058a8a659f2c0ea637
- https://git.kernel.org/stable/c/b1983840287303e0dfb401b1b6cecc5ea7471e90
- https://git.kernel.org/stable/c/dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227
- https://git.kernel.org/stable/c/1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0
- https://git.kernel.org/stable/c/a2ae33e1c6361e960a4d00f7cf75d880b54f9528
- https://git.kernel.org/stable/c/148891e95014b5dc5878acefa57f1940c281c431
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Sources
- CVE-2026-23221 · CVE Program
- CVE-2026-23221 · NVD
- FIRST EPSS
- GHSA-jp99-8xc8-367m · GitHub Advisory Database · CC BY 4.0
- CVE-2026-23221 · 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