{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64381", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.784Z", "datePublished": "2026-07-25T08:50:31.209Z", "dateUpdated": "2026-07-25T08:50:31.209Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:50:31.209Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server->smallbuf/server->bigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "94e4f672db029414b9888b5137a7559f1febf2d8", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "68fc0b6cc03ca58060c0f36454e169f5fe258974", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "07e0ab81df1790afa35732a4e8e07ff831b29008", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "9136a08dc29328edd9867f2545e73906ac9df93b", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "67097772df7791c53d608f04bd31c676ccf79b83", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "297243e365fc9fe2f8e9b7dd535a65d922cd108b", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "927d4805aea0a287d36dd4f826ee24d69a2afee3", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "1c6267a1d5cf4c73b656f8181b310cbbb3e4767b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "4.19", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8"}, {"url": "https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974"}, {"url": "https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008"}, {"url": "https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b"}, {"url": "https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83"}, {"url": "https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b"}, {"url": "https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3"}, {"url": "https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"}], "title": "smb: client: Fix next buffer leak in receive_encrypted_standard()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: smb: client: Fix next buffer leak in receive_encrypted_standard()", "id": "2507108", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507108"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["A flaw was found in the SMB client of the Linux kernel. A remote attacker could exploit a memory leak in the `receive_encrypted_standard()` function by sending specially crafted compound Protocol Data Units (PDUs). This vulnerability occurs because a buffer is allocated before a necessary size check, leading to the buffer not being freed if the check fails. Repeated exploitation of this flaw could lead to a Denial of Service (DoS) due to memory exhaustion."], "name": "CVE-2026-64381", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64381\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64381\nhttps://lore.kernel.org/linux-cve-announce/2026072525-CVE-2026-64381-5b4a@gregkh/T"], "threat_severity": "Moderate"}

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