CVE-2026-31710

smb: client: fix dir separator in SMB1 UNIX mounts

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-31710

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-31710

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/connect.c",
                        "fs/smb/client/smb1ops.c"
                    ],
                    "versions": [
                        {
                            "version": "4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880",
                            "lessThan": "fbbfcf35e1ee3396631f3dc6214cb626aa9814c3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880",
                            "lessThan": "c4d3fc5844d685441befd0caaab648321013cdfd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9d9f6e06123001208cd8ae6332c7e814ab709169",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.18.53",
                            "lessThan": "6.19",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/connect.c",
                        "fs/smb/client/smb1ops.c"
                    ],
                    "versions": [
                        {
                            "version": "7.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.2",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON