{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-45972", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.090Z", "datePublished": "2026-05-27T12:18:31.500Z", "dateUpdated": "2026-08-05T12:28:59.625Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:59.625Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF and double free in smb2_open_file()\n\nZero out @err_iov and @err_buftype before retrying SMB2_open() to\nprevent an UAF bug if @data != NULL, otherwise a double free." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The flaw is in the in-kernel SMB/CIFS client and is triggered entirely by SMB2 responses received over the network (TCP/445) from a malicious/compromised server or a network MITM; the attacker is a remote network peer.\nAC:L - The server fully controls both sides of the trigger — returning EACCES-with-buffer on the first open and success on the retry — and the vulnerable retry path is exercised by ordinary write-mode opens, so it is reliably triggerable with no attacker-uncontrolled condition or race.\nPR:N - The attacker is the remote SMB server (or MITM) and needs no authentication or privileges on the victim client; the malicious responses are delivered before/independent of any client-side credential check.\nUI:N - In the most severe reasonable deployment (a persistent/automounted share to a compromised or MITM'd server), routine background file opens drive the vulnerable retry with no dedicated user action at exploit time.\nS:U - The corruption stays within the kernel's slab allocator and the kernel's own security authority; no crossing of a VM, sandbox, or IOMMU boundary occurs.\nC:H - The use-after-free reads attacker-influenceable freed/reallocated buffer contents (hdr->Status and symlink parsing), and combined with heap grooming a UAF yields arbitrary kernel memory disclosure.\nI:H - A controlled double-free plus UAF are classic primitives for heap manipulation and arbitrary write, enabling control-flow hijacking and kernel code execution.\nA:H - The UAF/double-free corrupts slab state and reliably causes kernel oops/panic, fully compromising availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2file.c" ], "versions": [ { "version": "743f70406264348c0830f38409eb6c40a42fb2db", "lessThan": "96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74", "status": "affected", "versionType": "git" }, { "version": "3a6d6b332f92990958602c1e35ce0173e2dd62e9", "lessThan": "7425453ea16dbc3bbb0f6cac4d60b537e5e4d151", "status": "affected", "versionType": "git" }, { "version": "b64e3b5d8d759dd4333992e4ba4dadf9359952c8", "lessThan": "4d339b219004869e96c4ce56b8891f83a38da4c0", "status": "affected", "versionType": "git" }, { "version": "9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5", "lessThan": "e66dcf7bb9c4df5582c82bc3582725abcbfbea73", "status": "affected", "versionType": "git" }, { "version": "e3a43633023e3cacaca60d4b8972d084a2b06236", "lessThan": "639deb962986ef2f5e2a6d5a600c66f922471e81", "status": "affected", "versionType": "git" }, { "version": "e3a43633023e3cacaca60d4b8972d084a2b06236", "lessThan": "ebbbc4bfad4cb355d17c671223d0814ee3ef4eda", "status": "affected", "versionType": "git" }, { "version": "6.1.163", "lessThan": "6.1.165", "status": "affected", "versionType": "semver" }, { "version": "6.6.124", "lessThan": "6.6.128", "status": "affected", "versionType": "semver" }, { "version": "6.12.70", "lessThan": "6.12.75", "status": "affected", "versionType": "semver" }, { "version": "6.18.10", "lessThan": "6.18.14", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2file.c" ], "versions": [ { "version": "6.19", "status": "affected" }, { "version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.163", "versionEndExcluding": "6.1.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.124", "versionEndExcluding": "6.6.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.70", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.10", "versionEndExcluding": "6.18.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74" }, { "url": "https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151" }, { "url": "https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0" }, { "url": "https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73" }, { "url": "https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81" }, { "url": "https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda" } ], "title": "smb: client: fix potential UAF and double free in smb2_open_file()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "affected": [ { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:6" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" } ], "datePublic": "2026-05-27T00:00:00.000Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in the Linux kernel's Server Message Block (SMB) client. This vulnerability, within the `smb2_open_file()` function, could allow an attacker to cause memory corruption due to improper handling of memory during file open operations. This could lead to system instability or potentially enable an attacker to execute arbitrary code." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-825", "description": "Expired Pointer Dereference", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-45972" }, { "name": "RHBZ#2481973", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481973" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.json" } ], "timeline": [ { "lang": "en", "time": "2026-05-27T00:00:00.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-05-27T00:00:00.000Z", "value": "Made public." } ], "title": "kernel: smb: client: fix potential UAF and double free in smb2_open_file()", "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:51:59.819Z" } } ] } }