CVE-2026-64016

ksmbd: fix durable reconnect error path file lifetime

CVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-64016

Published

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix durable reconnect error path file lifetime After a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes the same ksmbd_file into the session volatile-id table. If smb2_open() then takes a later error path, cleanup first calls ksmbd_fd_put(work, fp) and then unconditionally calls ksmbd_put_durable_fd(dh_info.fp). In this case fp and dh_info.fp are the same object. The first put drops the reconnect lookup reference, but the final durable put can run __ksmbd_close_fd(NULL, fp). Because the final close is not session-aware, it can free the file object without removing the volatile-id entry that was just published into the session table. Use the session-aware put for the final reconnect drop when the reconnect had already succeeded and the error path is cleaning up the republished file. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep using the durable-only put path.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-64016

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/server/smb2pdu.c"
                    ],
                    "versions": [
                        {
                            "version": "f0ff7f12398e85b3a11745ff7feab6246f3d75c2",
                            "lessThan": "5e641e4ee0bc1937408d41051a908ad4151be63b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4db3dcac84c2f14a45ae201efb38de1fb1bfc009",
                            "lessThan": "478bfaa036bd0c7e179acff8b8484bccdee3b8c7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ce2e164c1c51c3f7813b80f8c926836e896bcbb3",
                            "lessThan": "a1a39f227c80cbf369767badc32cba2b225147d1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "97a0cd55283b4e63fd92804da91c8d9896adcad9",
                            "lessThan": "6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1baff47b81f94f9231c91236aa511420d0e266b9",
                            "lessThan": "3515503322f4819277091839eed46b695096aca5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

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/server/smb2pdu.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18.33",
                            "lessThan": "6.18.34",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "lessThan": "7.0.11",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

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