CVE-2026-89720Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's Unsorted Block Image File System (UBIFS). An incorrect bounds check in the ubifs_sb_verify_signature() function allows a crafted signed UBIFS image to declare a signature length larger than its actual…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · 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%
— → 4.7
none → medium
— → 4.7
none → medium
— → 7.7
none → high
7.7 → 4.7
high → medium
4.7 → 7.7
medium → high
Last analysed / modified upstream
7.7 → 5.5
high → medium
A flaw was found in the Linux kernel's Unsorted Block Image File System (UBIFS). An incorrect bounds check in the ubifs_sb_verify_signature() function allows a crafted signed UBIFS image to declare a signature length larger than its actual size. This can lead to an out-of-bounds read when processing the signature, potentially causing information disclosure or a system crash (Denial of Service).
kernel: ubifs: fix out-of-bounds read in signature length check — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
Not affected:
Refer to the advisory for fix availability.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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