Bug 2464394 (CVE-2026-31710) - CVE-2026-31710 kernel: smb: client: fix dir separator in SMB1 UNIX mounts
Summary: CVE-2026-31710 kernel: smb: client: fix dir separator in SMB1 UNIX mounts
Keywords:
Status: NEW
Alias: CVE-2026-31710
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-01 15:04 UTC by OSIDB Bzimport
Modified: 2026-05-01 20:17 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-01 15:04:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix dir separator in SMB1 UNIX mounts

When calling cifs_mount_get_tcon() with SMB1 UNIX mounts,
@cifs_sb->mnt_cifs_flags needs to be read or updated only after
calling reset_cifs_unix_caps(), otherwise it might end up with missing
CIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits.

This fixes the wrong dir separator used in paths caused by the missing
CIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags.
Comment 1 Keith Grant 2026-05-01 20:15:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050122-CVE-2026-31710-511c@gregkh/T
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