SB20260918171 - Double free in Linux kernel mtd driver
Published: September 18, 2026
Security Bulletin ID
SB20260918171
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-2026-93049)
CWE-ID: CWE-415 - Double Free
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a double free in mtdswap_add_mtd() cleanup handling when debugfs setup fails after blktrans device registration. A local user can trigger the debugfs failure sequence to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
- https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9
- https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777
- https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87
- https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901
- https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4
- https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1
- https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726