Stack-based buffer overflow in Linux kernel - CVE-2026-99098
Published: October 26, 2026
Vulnerability identifier: #VU157699
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99098
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a stack-based buffer overflow in dm_integrity_check and dm_integrity_inline_recheck when computing block checksums in inline mode. A local privileged user can configure a tag size larger than HASH_MAX_DIGESTSIZE and trigger a read to cause checksum padding to overflow the on-stack digest buffer and cause a denial of service.
With CONFIG_STACKPROTECTOR enabled, the kernel panics in dm_integrity_check on the first read.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99098
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