CVE-2026-89745High· 7.0▾ TwilightA flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the `mmap_prepare` operation. This oversight could allow an attacker to bypass…
▾ 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%
— → 4.4
none → medium
— → 4.4
none → medium
— → 4.4
none → medium
Last analysed / modified upstream
4.4 → 7
medium → high
A flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the mmap_prepare operation. This oversight could allow an attacker to bypass kernel lockdown restrictions when the system is operating in integrity mode, potentially compromising system integrity.
kernel: debugfs: Fix lockdown check for mmap_prepare — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.
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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