ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered If a synchronous error is detected as a result of user-space process triggering a 2-bit uncorrected error, the CPU will take a synchronous error exception such as Synchronous External Abort (SEA) on Arm64. The kernel will queue a memory_failure() work which poisons the related page, unmaps the page, and then sends a SIGBUS to the process, so that a system wide panic can be avoided. However, no memory_failure() work will be queued when abnormal synchronous errors occur. These errors can include situations like invalid PA, unexpected severity, no memory failure config support, invalid GUID section, etc. In such a case, the user-space process will trigger SEA again. This loop can potentially exceed the platform firmware threshold or even trigger a kernel hard lockup, leading to a system reboot. Fix it by performing a force kill if no memory_failure() work is queued for synchronous errors. [ rjw: Changelog edits ]
Why it matters now
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 | 5.4.69 to before 5.5 | 5.5 | Patch available | CNA |
| Linux | Linux | 5.8 and later | 6.1.164, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 | Patch available | CNA |
- Linux VendorLinux Affected 5.4.69 to before 5.5 Fixed in 5.5 Patch available CNA
- Linux VendorLinux Affected 5.8 and later Fixed in 6.1.164, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.5
- Fix · CNA Linux (Linux) Fixed in 6.1.164, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17
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 |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| 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 |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-39763
- 2026-10-03 Alias added: GHSA-g7f2-49vp-j5f7
- 2026-11-05 CISA SSVC decision points changed
References
Patch 6
- https://git.kernel.org/stable/c/2fbc85da9ac9386bd89fcc94e0aadaea19d47784
- https://git.kernel.org/stable/c/082735fbcdb6cd0cf20fbec94516ab2996f1cdd5
- https://git.kernel.org/stable/c/cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1
- https://git.kernel.org/stable/c/af089e41811a1ad6a7b2b80e839a73ec4c3cecdd
- https://git.kernel.org/stable/c/3cb4f18797247985b0f51d5300f8cb6c78f343ea
- https://git.kernel.org/stable/c/79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060
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Sources
- CVE-2025-39763 · CVE Program
- CVE-2025-39763 · NVD
- FIRST EPSS
- GHSA-g7f2-49vp-j5f7 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-39763 · 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