{"id":"CVE-2026-64357","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix exchmaps reservation limit check\n\nxfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt\noverhead to a local resblks variable, but the final UINT_MAX\ncheck …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix exchmaps reservation limit check\n\nxfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt\noverhead to a local resblks variable, but the final UINT_MAX\ncheck …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.10, < 6.12.96","linux_kernel >= 6.13, < 6.18.39","linux_kernel >= 6.19, < 7.1.4"],"patched":["linux_kernel 7.1.4"],"published":"2026-07-25","updated":"2026-09-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64357","references":[{"url":"https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00122,"epssPercentile":0.02268,"ingestedAt":"2026-09-05T13:39:56.757Z","slug":"CVE-2026-64357","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix exchmaps reservation limit check\n\nxfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt\noverhead to a local resblks variable, but the final UINT_MAX\ncheck still tests req->resblks.  That is the reservation value\nfrom before the overhead was added.\n\nThe computed value is stored back in req->resblks and later passed\nto xfs_trans_alloc(), whose block reservation argument is unsigned\nint.  Check the computed reservation so the existing limit applies\nto the value that will be used.\n\n## Affected\n\n- `linux_kernel >= 6.10, < 6.12.96`\n- `linux_kernel >= 6.13, < 6.18.39`\n- `linux_kernel >= 6.19, < 7.1.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.4`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}