SB20260727210 - Integer overflow in Linux kernel xfs libxfs

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-64357)

CWE-ID: CWE-190 - Integer overflow

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 an integer overflow in xfs_exchmaps_estimate_overhead() when calculating block reservation overhead for exchange mappings. A local user can trigger the vulnerable calculation to cause a denial of service.

The issue occurs because the limit check is applied to the pre-overhead reservation value instead of the computed reservation value that is later passed to xfs_trans_alloc().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45
• https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1
• https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112
• https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3