CVE-2026-53010

ksmbd: fix use-after-free in smb2_open during durable reconnect

CVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-53010

Published

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_open during durable reconnect In smb2_open, the call to ksmbd_put_durable_fd(fp) drops the reference to the durable file descriptor early during the durable reconnect process. If an error occurs subsequently (eg, ksmbd_iov_pin_rsp fails) or a scavenger accesses the file, it leads to a use-after-free when accessing fp properties (eg fp->create_time). Move the single put to the end of the function below err_out2 so fp stays valid until smb2_open returns.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-53010

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": "8df4bcdb0a4232192b2445256c39b787d58ef14d",
                            "lessThan": "f0ff7f12398e85b3a11745ff7feab6246f3d75c2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "4db3dcac84c2f14a45ae201efb38de1fb1bfc009",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "ce2e164c1c51c3f7813b80f8c926836e896bcbb3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "97a0cd55283b4e63fd92804da91c8d9896adcad9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
                            "lessThan": "1baff47b81f94f9231c91236aa511420d0e266b9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.6.32",
                            "lessThan": "6.6.157",
                            "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/server/smb2pdu.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "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