SB20260727351 - NULL pointer dereference in Linux kernel tty serial driver
Published: July 27, 2026
Security Bulletin ID
SB20260727351
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) NULL pointer dereference (CVE-ID: CVE-2026-64234)
CWE-ID: CWE-476 - NULL Pointer Dereference
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 a denial of service.
The vulnerability exists due to a NULL pointer dereference in dma_handle_rx() in the pch_uart driver when handling DMA receive operations after coherent DMA buffer allocation fails. A local user can trigger allocation failure conditions to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf
- https://git.kernel.org/stable/c/66f8bfea055b23719b4fd6ce207c44de37d82a59
- https://git.kernel.org/stable/c/6dd5c0ea139b586ad5a091677056dafd405cfe82
- https://git.kernel.org/stable/c/6fe472c1bbbe238e91141f7cabc1226e96a60d43
- https://git.kernel.org/stable/c/760df81763b391bb5f0dcb0b7597b736da753ae4
- https://git.kernel.org/stable/c/d846df2dfbc2469a688833b4cc4f8aa80672bde8
- https://git.kernel.org/stable/c/d8d53a343ebe74274ca17b1e1993042e99f8c863
- https://git.kernel.org/stable/c/daea997bb244aeb50cbb2e5e075fb446a6cf068f