CVE-2025-40200
Published Nov 12, 2025
Modified Apr 15, 2026
Description
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. [[email protected]: only need to check 64 bit quantity]
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References
Other References
https://git.kernel.org/stable/c/2871c74caa3f4f05b429e6bfefebac62dbf1b408
https://git.kernel.org/stable/c/54170057a5fadd24a37b70de41e61d39284d9bd7
https://git.kernel.org/stable/c/8118f66124895829443d09c207e654adcb2f9321
https://git.kernel.org/stable/c/875fb3f87ae0225b881319ba016a1a8c4ffd5812
https://git.kernel.org/stable/c/8c7aad76751816207fee556d44aa88a710824810
https://git.kernel.org/stable/c/9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2b
https://git.kernel.org/stable/c/f271155ff31aca8ef82c61c8df23ca97e9a77dd4
https://git.kernel.org/stable/c/fbfc745db628de31f5c089147deeb87e95b89e66
Frequently Asked Questions
What is CVE-2025-40200? +
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.
[[email protected]: only need to check 64 bit quantity]
How do I check if I'm vulnerable to CVE-2025-40200? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.