158 lines
8.6 KiB
JSON
158 lines
8.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38092",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.983Z",
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"datePublished": "2025-07-02T14:43:30.776Z",
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"dateUpdated": "2026-08-05T11:59:27.724Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:59:27.724Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use list_first_entry_or_null for opinfo_get_list()\n\nThe list_first_entry() macro never returns NULL. If the list is\nempty then it returns an invalid pointer. Use list_first_entry_or_null()\nto check if the list is empty."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - ksmbd is the in-kernel SMB server; the vulnerable path is driven entirely by remote SMB2 CREATE, LOCK and CLOSE requests arriving on TCP/445 from a remote client. No local access is required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2 CREATE/LOCK and CLOSE requests on multiple connections against the same file, and the window is actively widened because down_read() in opinfo_get_list() blocks behind the racing opinfo_del() down_write() that empties the list.\nPR:L - Reaching smb_grant_oplock()/smb_break_all_oplock() requires an established SMB2 session, a tree connect and open file handles, so a valid (even low-privilege or guest-mapped) SMB account is needed; this is not a pre-authentication code path.\nUI:N - The attacker drives every step from its own SMB connections — opening handles with oplocks/leases and closing them concurrently. No action by any other user or administrator is needed.\nS:U - The type confusion corrupts kernel heap memory belonging to the ksmbd subsystem within the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The fake oplock_info causes reads through attacker-timed wild pointers — opinfo->conn resolves to an rwsem waiter on another task's kernel stack and o_lease to an arbitrary kernel pointer — and such heap type confusion is leverageable into arbitrary kernel memory disclosure.\nI:H - atomic_inc_not_zero() performs a real RMW write onto the upper half of ksmbd_inode->m_hash.pprev, corrupting a kernel pointer that hlist_del_init() later writes through, and follow-on oplock_break()/opinfo_put() paths add out-of-bounds wait-queue list writes and kfree() of interior pointers — classic type confusion promotable to a write primitive.\nA:H - Dereferencing and atomically modifying a bogus pointer derived from the list head, plus spinlock/wait-queue operations past the end of the kmalloc'd ksmbd_inode, reliably produce slab corruption, oops or panic, taking down the file server host."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/oplock.c"
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],
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"versions": [
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{
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"version": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6",
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"lessThan": "c78abb646ff823e7d22faad4cc0703d4484da9e8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d54ab1520d43e95f9b2e22d7a05fc9614192e5a5",
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"lessThan": "334da674b25fdb7a1a4d4b89dcd7795144fc7e11",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d73686367ad68534257cd88a36ca3c52cb8b81d8",
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"lessThan": "cb7e06e9736d73007dc8dab7b353733bb37df86b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7",
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"lessThan": "10379171f346e6f61d30d9949500a8de4336444a",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/oplock.c"
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],
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"versions": [
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{
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"version": "6.6.88",
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"lessThan": "6.6.93",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.25",
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"lessThan": "6.12.32",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.14.4",
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"lessThan": "6.14.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.88",
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"versionEndExcluding": "6.6.93"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.25",
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"versionEndExcluding": "6.12.32"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14.4",
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"versionEndExcluding": "6.14.10"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c78abb646ff823e7d22faad4cc0703d4484da9e8"
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},
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{
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"url": "https://git.kernel.org/stable/c/334da674b25fdb7a1a4d4b89dcd7795144fc7e11"
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},
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{
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"url": "https://git.kernel.org/stable/c/cb7e06e9736d73007dc8dab7b353733bb37df86b"
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},
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{
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"url": "https://git.kernel.org/stable/c/10379171f346e6f61d30d9949500a8de4336444a"
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}
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],
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"title": "ksmbd: use list_first_entry_or_null for opinfo_get_list()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |