CVE-2022-48627: vt: fix memory overlapping when deleting chars in the buffer

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-06-17
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: vt: fix memory overlapping when deleting chars in the buffer A memory overlapping copy occurs when deleting a long line. This memory overlapping copy can cause data corruption when scr_memcpyw is optimized to memcpy because memcpy does not ensure its behavior if the destination buffer overlaps with the source buffer. The line buffer is not always broken, because the memcpy utilizes the hardware acceleration, whose result is not deterministic. Fix this problem by using replacing the scr_memcpyw with scr_memmovew.

Affected products

Debian Linux: 10.0
Linux kernel: from 3.7 through 4.19.312; from 4.20 before 5.4.274; from 5.5 before 5.10.132; from 5.11 before 5.15.56; from 5.16 before 5.18.13; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5, 5.19-rc6 — fixed in 5.10.132, 5.15.56, 5.18.13, 5.4.274

How to fix

Upgrade to a fixed version: Linux kernel 5.10.132, 5.15.56, 5.18.13, 5.4.274. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-48627 or the next vulnerability affects your stack