CVE-2025-39763None▾ SunlitIn 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-b…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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 ]
Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 2fbc85da9ac9386bd89fcc94e0aadaea19d47784Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 082735fbcdb6cd0cf20fbec94516ab2996f1cdd5Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < af089e41811a1ad6a7b2b80e839a73ec4c3cecddLinux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 3cb4f18797247985b0f51d5300f8cb6c78f343eaLinux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060Linux af02933d59bd1621a48d8b0b331cca9e530ba14bLinux >= 5.4.69 < 5.5Linux 5.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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