CVE-2026-97610

Summary

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix uninitialized return value in netfs_unbuffered_write()

If preparation of the first subrequest fails, netfs_unbuffered_write() exits its loop before ret is initialized. The empty-iterator check can do the same.

For synchronous writes, netfs_unbuffered_write_iter_locked() may then return an unrelated error instead of wreq->error. This is reachable through CIFS if cifs_prepare_write() fails to reopen the file or obtain credits.

Initialize ret to 0 so the caller returns wreq->error if no data was written, or the number of bytes already written otherwise.

Found with Clang's -Wconditional-uninitialized.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux72d08d2839649d1c5efbe375751f4473fa4486af < 3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26affected
LinuxLinuxa0b4c7a49137ed21279f354eb59f49ddae8dffc2 < 2e38d500471d097cda87d7d374bbc1b13493075daffected
LinuxLinuxa0b4c7a49137ed21279f354eb59f49ddae8dffc2 < f18e8774f4d3137fa0a5fb8ffa83d59a719666d8affected
LinuxLinux0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0affected
LinuxLinux6.18.17 < 6.18.53affected
LinuxLinux6.19.7 < 6.20affected
LinuxLinux7.0affected
LinuxLinux0 < 7.0unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References