SB20260527108 - Double free in Linux kernel block driver
Published: May 27, 2026
Security Bulletin ID
SB20260527108
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Double free (CVE-ID: CVE-2026-46079)
CWE-ID: CWE-415 - Double Free
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a double free in the rbd device add error-handling path when handling a failure after device_add() succeeds but device_add_disk() fails. A local user can trigger the vulnerable teardown sequence by writing to /sys/bus/rbd/add_single_major to cause a denial of service.
Exploitation was reproduced when fault injection was confined to the __add_disk() range.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/059fb7656723c1b77c2fc0e64b7aa99d6bb65e8e
- https://git.kernel.org/stable/c/2f4809a879f0750c7790bbeeae86c9505797a06f
- https://git.kernel.org/stable/c/564cd8f4aeb9a938e470c5c91922fd02e4d41acc
- https://git.kernel.org/stable/c/ad0126ffcba8777109852979eaaa6dca6703abdb
- https://git.kernel.org/stable/c/d1fef92e414433ca7b89abf85cb0df42b8d475eb