CVE-2026-89754High· 7.0▾ TwilightA flaw was found in the Linux kernel's memory management (mm/pagewalk) component. An issue in the `walk_pmd_range()` function, where a stale `walk->action` state is not properly reset, can lead to duplicate walk callbacks. A local attacker…
▾ 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%
— → 6.3
none → medium
— → 6.3
none → medium
— → 7.8
none → high
7.8 → 6.3
high → medium
6.3 → 7.8
medium → high
Last analysed / modified upstream
7.8 → 7
A flaw was found in the Linux kernel's memory management (mm/pagewalk) component. An issue in the walk_pmd_range() function, where a stale walk->action state is not properly reset, can lead to duplicate walk callbacks. A local attacker could exploit this to trigger an out-of-bounds write, potentially causing memory corruption and system instability.
kernel: mm/pagewalk: fix stale walk->action escaping walk_pmd_range() — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.
Affected:
No fix planned:
Not affected:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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