{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31693", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.131Z", "datePublished": "2026-04-30T11:47:01.230Z", "dateUpdated": "2026-10-16T15:20:24.344Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:31.188Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: some missing initializations on replay\n\nIn several places in the code, we have a label to signify\nthe start of the code where a request can be replayed if\nnecessary. However, some of these places were missing the\nnecessary reinitializations of certain local variables\nbefore replay.\n\nThis change makes sure that these variables get initialized\nafter the label." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable replay paths are reached through local CIFS filesystem operations such as ioctl(CIFS_QUERY_INFO), setxattr, and mkdir on an existing SMB/CIFS mount.\nAC:L - Replay is triggered by -EAGAIN/-ECONNABORTED reconnect conditions, which a controlled or malicious SMB server can force, and the local caller controls the ioctl/xattr/mkdir inputs across retries.\nPR:L - The strongest reachable path, PASSTHRU_QUERY_INFO in smb2_ioctl_query_info(), has no CAP_SYS_ADMIN check and can be invoked by an unprivileged user with access to a mounted CIFS file.\nUI:N - A local attacker can invoke the filesystem operation directly; no separate victim action is required once the CIFS mount is available.\nS:U - The vulnerability corrupts kernel memory in the same kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - Missing reinitialization can leave freed heap pointers live across replay, creating use-after-free/double-free style memory corruption that can be leveraged for kernel memory disclosure.\nI:H - Kernel heap double-free/use-after-free conditions are memory corruption primitives that can plausibly be shaped into arbitrary write or control-flow compromise.\nA:H - Even without full exploitation, stale pointer reuse or double-free in these replay paths can crash or oops the kernel." } ] } ], "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", "fs/smb/client/smb2pdu.c" ], "versions": [ { "version": "433042a91f9373241307725b52de573933ffedbf", "lessThan": "c854ab481ece4b3e5f4c2e8b22824f015ff874a5", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "1d731e512134495e0ef490ade0e4d91dc0d515ec", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "7c9ce68192eef14c777cb6ce17155d2eb2431aea", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "c99e160938b627f6f28edee930e8abc157e84386", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "14f66f44646333d2bfd7ece36585874fd72f8286", "status": "affected", "versionType": "git" }, { "version": "6.6.32", "lessThan": "6.6.128", "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/smb2ops.c", "fs/smb/client/smb2pdu.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "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": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "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": "6.6.32", "versionEndExcluding": "6.6.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c854ab481ece4b3e5f4c2e8b22824f015ff874a5" }, { "url": "https://git.kernel.org/stable/c/1d731e512134495e0ef490ade0e4d91dc0d515ec" }, { "url": "https://git.kernel.org/stable/c/7c9ce68192eef14c777cb6ce17155d2eb2431aea" }, { "url": "https://git.kernel.org/stable/c/c99e160938b627f6f28edee930e8abc157e84386" }, { "url": "https://git.kernel.org/stable/c/14f66f44646333d2bfd7ece36585874fd72f8286" } ], "title": "cifs: some missing initializations on replay", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-31693", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:12:31.622754Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:20:24.344Z" } } ] } }