269 lines
14 KiB
JSON
269 lines
14 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-2025-21967",
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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": "2024-12-29T08:45:45.796Z",
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"datePublished": "2025-04-01T15:47:02.364Z",
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"dateUpdated": "2026-10-30T12:21:05.006Z"
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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": "2026-10-30T12:21:05.006Z"
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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: fix use-after-free in ksmbd_free_work_struct\n\n->interim_entry of ksmbd_work could be deleted after oplock is freed.\nWe don't need to manage it with linked list. The interim request could be\nimmediately sent whenever a oplock break wait is needed."
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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 listening on TCP/445, and the entire trigger sequence (a CREATE requesting a batch oplock/write lease on one connection, a conflicting overwrite CREATE plus a close/disconnect on a second) is driven purely by remote SMB2 protocol traffic. No local access to the target is required.\nAC:L - The double `list_add` of the same `work->interim_entry` in `smb2_open()` is deterministic, not racy, and the attacker owns both connections so it chooses exactly when the peer's `oplock_info` is released relative to `ksmbd_free_work_struct()`, and can loop the sequence indefinitely. Per guidance, an attacker-created ordering and a use-after-free are Low.\nPR:L - Reaching `smb_grant_oplock()`/`smb_break_all_oplock()` requires a completed SESSION_SETUP, TREE_CONNECT and SMB2 CREATE, so an authenticated but otherwise unprivileged share account (including a mapped guest) is needed. This matches the scoring of the sibling post-authentication ksmbd oplock UAFs.\nUI:N - The attacker drives every step from its own two SMB sessions — take the oplock, issue the conflicting overwrite CREATE, then close or drop the first connection. No administrator or other client has to do anything.\nS:U - The list corruption and its consequences stay entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `interim_list` head lets `smb2_lease_break_noti()` treat reclaimed heap memory as a `struct ksmbd_work`, dereferencing its `conn`, `sess`, and `request_buf` fields, and `smb2_send_interim_resp()` then transmits data derived from that object back to the attacker — an arbitrary kernel memory disclosure primitive after a heap spray.\nI:H - `list_del()` in `ksmbd_free_work_struct()` writes two attacker-influenced kernel heap pointers at a fixed offset into a freed kmalloc-256 slot that the attacker can reclaim with a chosen object, and the fake-`ksmbd_work` path yields further controlled pointer writes and indirect calls, giving control-flow hijack.\nA:H - Even unweaponized, the `list_del` on freed memory trips `CONFIG_DEBUG_LIST`/`BUG()` or silently corrupts the slab, and walking the dangling `interim_list` oopses the ksmbd worker; the attacker can repeat it at will to keep the file server down."
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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/ksmbd_work.c",
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"fs/smb/server/ksmbd_work.h",
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"fs/smb/server/oplock.c",
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"fs/smb/server/oplock.h"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "ffe0909010b21df8f948d624ad00cf14dd856721",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "62746ae3f5414244a96293e3b017be637b641280",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "eb51f6f59d19b92f6fe84d3873f958495ab32f0a",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "bb39ed47065455604729404729d9116868638d31",
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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": "affected",
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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/ksmbd_work.c",
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"fs/smb/server/ksmbd_work.h",
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"fs/smb/server/oplock.c",
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"fs/smb/server/oplock.h"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.84",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.20",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13.8",
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"lessThanOrEqual": "6.13.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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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": "5.15",
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"versionEndExcluding": "6.1.191"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.13.8"
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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": "5.15",
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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/ffe0909010b21df8f948d624ad00cf14dd856721"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3"
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},
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{
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"url": "https://git.kernel.org/stable/c/62746ae3f5414244a96293e3b017be637b641280"
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},
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{
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"url": "https://git.kernel.org/stable/c/eb51f6f59d19b92f6fe84d3873f958495ab32f0a"
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},
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{
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"url": "https://git.kernel.org/stable/c/bb39ed47065455604729404729d9116868638d31"
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}
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],
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"title": "ksmbd: fix use-after-free in ksmbd_free_work_struct",
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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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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21967",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-04-16T13:14:51.011092Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-04-16T13:19:52.457Z"
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}
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}
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]
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}
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} |