Out-of-bounds write in Linux kernel - CVE-2026-89607
Published: September 12, 2026
Vulnerability identifier: #VU149200
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89607
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to out-of-bounds writes in parse_tag_3_packet() and decrypt_passphrase_encrypted_session_key() when processing a crafted Tag 3 packet through the passphrase decryption path. A local user can supply a crafted Tag 3 packet with an oversized encrypted key size to cause memory corruption.
Only the AES-192 cipher configuration enables exploitation because its key size is set independently of the encrypted key size.
Affected software
Linux kernel
How to mitigate CVE-2026-89607
Install security update from vendor's repository.