CVE-2024-42084: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ftruncate: pass a signed offset The old ftruncate() syscall, using the 32-bit off_t misses a sign extension when called in compat mode on 64-bit architectures. As a result, passing a negative length accidentally succeeds in truncating to file size between 2GiB and 4GiB. Changing the type of the compat syscall to the signed compat_off_t changes the behavior so it instead returns -EINVAL. The native entry point, the truncate() syscall and the corresponding loff_t based variants are all correct already and do not suffer from this mistake.

Affected products

• Linux Linux Kernel: from 3.9, before 4.19.317 (fixed in 4.19.317); from 4.20, before 5.4.279 (fixed in 5.4.279); from 5.5, before 5.10.221 (fixed in 5.10.221); from 5.11, before 5.15.162 (fixed in 5.15.162); from 5.16, before 6.1.97 (fixed in 6.1.97); from 6.2, before 6.6.37 (fixed in 6.6.37); …

Published 2024-07-29. Last modified 2026-06-17.