{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-22042", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.809Z", "datePublished": "2025-04-16T14:12:03.896Z", "dateUpdated": "2026-08-05T11:56:15.350Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:56:15.350Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: add bounds check for create lease context\n\nAdd missing bounds check for create lease context." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in ksmbd, the in-kernel SMB server, and is triggered purely by a malformed SMB2 CREATE request with a crafted \"RqLs\" create context arriving over TCP/445. No local access is needed.\nAC:L - A single deterministically crafted request (DataOffset=0, DataLength=0, CreateContextsLength=20) passes smb2_find_context_vals() and reaches the fixed-offset read every time; there is no race, no timing window, and no dependence on memory layout for the disclosure.\nPR:L - SMB2_CREATE is dispatched only after a valid SessionId (ksmbd_session_lookup) and tree connect, so the attacker needs SMB credentials — though a guest-mapped share reduces this to effectively none.\nUI:N - The attacker triggers the flaw entirely by sending packets to the listening ksmbd service; no action by any local user or administrator is required.\nS:U - The out-of-bounds read stays within the kernel's own heap and the impact is confined to the kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 36 bytes of adjacent kernel heap memory are read, and the first 16 (the lease key) are echoed verbatim to the remote attacker in the CREATE response via create_lease_buf(), giving a repeatable heap-disclosure oracle with attacker-controlled allocation sizing for grooming — sufficient to defeat KASLR and leak neighbouring object contents.\nI:N - The flaw is a read-only over-read; the memcpy destinations are correctly sized kzalloc'd objects and no attacker-controlled out-of-bounds write or control-flow corruption occurs.\nA:H - Because the attacker sizes the kvmalloc'd request buffer, the read can be positioned to run off the end of a vmalloc-backed allocation into a guard page, and on KASAN/hardened kernels it triggers an oops/panic, taking down the SMB server and potentially the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/oplock.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "629dd37acc336ad778979361c351e782053ea284", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "60b7207893a8a06c78441934931a08fdad63f18e", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "800c482c9ef5910f05e3a713943c67cc6c1d4939", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a41cd52f00907a040ca22c73d4805bb79b0d0972", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "9a1b6ea955e6c7b29939a6d98701202f9d9644ec", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "bab703ed8472aa9d109c5f8c1863921533363dae", "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/server/oplock.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.134", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.87", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.23", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.11", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.2", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "5.15", "versionEndExcluding": "6.1.134" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/629dd37acc336ad778979361c351e782053ea284" }, { "url": "https://git.kernel.org/stable/c/60b7207893a8a06c78441934931a08fdad63f18e" }, { "url": "https://git.kernel.org/stable/c/800c482c9ef5910f05e3a713943c67cc6c1d4939" }, { "url": "https://git.kernel.org/stable/c/a41cd52f00907a040ca22c73d4805bb79b0d0972" }, { "url": "https://git.kernel.org/stable/c/9a1b6ea955e6c7b29939a6d98701202f9d9644ec" }, { "url": "https://git.kernel.org/stable/c/bab703ed8472aa9d109c5f8c1863921533363dae" } ], "title": "ksmbd: add bounds check for create lease context", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:41:24.487Z" } } ] } }