SB2026072107 - Out-of-bounds write in Linux kernel keys
Published: July 21, 2026
Security Bulletin ID
SB2026072107
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) Out-of-bounds write (CVE-ID: CVE-2026-63824)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to a buffer overflow in keyctl_pkey_params_get_2() when processing crafted keyctl public-key operation parameters. A local user can provide a too small buffer length to cause memory corruption.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3
- https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d
- https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c
- https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a
- https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78
- https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c
- https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a
- https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b