CVE-2025-40200
Squashfs: reject negative file sizes in squashfs_read_inode()
Vexday Risk Score
3Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
12 Nov 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
In the Linux kernel, the following vulnerability has been resolved:
Squashfs: reject negative file sizes in squashfs_read_inode()
Syskaller reports a "WARNING in ovl_copy_up_file" in overlayfs.
This warning is ultimately caused because the underlying Squashfs file
system returns a file with a negative file size.
This commit checks for a negative file size and returns EINVAL.
[phillip@squashfs.org.uk: only need to check 64 bit quantity]
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/2871c74caa3f4f05b429e6bfefebac62dbf1b408https://git.kernel.org/stable/c/54170057a5fadd24a37b70de41e61d39284d9bd7https://git.kernel.org/stable/c/8118f66124895829443d09c207e654adcb2f9321https://git.kernel.org/stable/c/875fb3f87ae0225b881319ba016a1a8c4ffd5812https://git.kernel.org/stable/c/8c7aad76751816207fee556d44aa88a710824810https://git.kernel.org/stable/c/9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2bhttps://git.kernel.org/stable/c/f271155ff31aca8ef82c61c8df23ca97e9a77dd4https://git.kernel.org/stable/c/fbfc745db628de31f5c089147deeb87e95b89e66