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CVE-2026-90176

HIGHCVSS 8.1/10

Last modified

CVE-2026-90176 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not skip lock checks for single-byte ranges check_lock_range() uses inclusive ranges. Its callers pass the end offset as start + length - 1, so start == end represents a valid single-byte range rather than an empty range. The start == end shortcut therefore skips mandatory byte-range lock checks for one-byte reads, writes, copychunk operations and one-byte truncate ranges.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not skip lock checks for single-byte ranges check_lock_range() uses inclusive ranges. Its callers pass the end offset as start + length - 1, so start == end represents a valid single-byte range rather than an empty range. The start == end shortcut therefore skips mandatory byte-range lock checks for one-byte reads, writes, copychunk operations and one-byte truncate ranges. A conflicting lock covering that byte is not checked and the operation is allowed to proceed. Remove the shortcut. The truncate size == inode->i_size case is already handled by only calling check_lock_range() when the new size differs from the current file size.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 52fcbb92e0d3acfd1448b2a43b6595d540da5295, < a89cc145832e81c32199d4ca2e1ea8bd51ed601d; >= da29cd197246c85c0473259f1cad897d9d28faea, < 993e0158331d37c04da18efe551b5e1e35fb3078; >= a6f4cfa3783804336491e0edcb250c25f9b59d33, < f751d6e39d4c937c45f8fedc66699aa7d2d52288; >= 571204e4758a528fbd67330bd4b0dfbdafb33dd8, < 84c2d8e807ac489f5c91769293fb15dfdae8bae8; >= 5d510ac31626ed157d2182149559430350cf2104, < 07a9e289ff7edcc004f58952405f8a65c4e37512; >= 5d510ac31626ed157d2182149559430350cf2104, < d40c24634fe077a0dc91fd11fccf44ce12b454d5; >= 6.1.160, < 6.1.188; >= 6.6.120, < 6.6.157; >= 6.12.64, < 6.12.110; >= 6.18.3, < 6.18.52
LinuxLinux6.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90176?
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not skip lock checks for single-byte ranges check_lock_range() uses inclusive ranges. Its callers pass the end offset as start + length - 1, so start == end represents a valid single-byte range rather than an empty range. The start == end shortcut therefore skips mandatory byte-range lock checks for one-byte reads, writes, copychunk operations and one-byte truncate ranges. A conflicting lock covering that byte is not checked and the operation is allowed to proceed. Remove the shortcut. The truncate size == inode->i_size case is already handled by only calling check_lock_range() when the new size differs from the current file size.
How severe is CVE-2026-90176?
CVE-2026-90176 has a CVSS score of 8.1/10 (HIGH severity).
How do I fix CVE-2026-90176?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST