Infinite loop in Linux kernel - CVE-2026-99135
Published: October 29, 2026
Vulnerability identifier: #VU158455
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99135
CWE-ID: CWE-835
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service by triggering an infinite loop during discard processing.
The vulnerability exists due to an incorrect fallback buffer size calculation in the dm-integrity integrity_metadata() function when processing discard requests after a memory allocation failure. A local user can trigger discard processing on a device configured with a tag size greater than HASH_MAX_DIGESTSIZE to cause max_blocks to become zero, preventing bi_size from decreasing and causing an infinite loop.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99135
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2