CVE-2026-89587High· 7.0▾ TwilightA flaw was found in the Linux kernel's ACPI Platform Firmware Runtime Update (pfr_update) component. The `query_capability()` function, responsible for handling ACPI buffer objects from firmware, performs an unchecked memory copy operation…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 5.7
none → medium
— → 5.7
none → medium
— → 7.8
none → high
7.8 → 5.7
high → medium
5.7 → 7.8
medium → high
Last analysed / modified upstream
7.8 → 7
A flaw was found in the Linux kernel's ACPI Platform Firmware Runtime Update (pfr_update) component. The query_capability() function, responsible for handling ACPI buffer objects from firmware, performs an unchecked memory copy operation. If the firmware provides an oversized buffer, a stack buffer overflow occurs, leading to memory corruption. This could allow a local attacker to cause a denial of service or potentially execute arbitrary code.
kernel: ACPI: pfr_update: fix stack buffer overflow in query_capability() — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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