264 lines
13 KiB
JSON
264 lines
13 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-2024-35864",
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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": "2024-05-17T13:50:33.107Z",
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"datePublished": "2024-05-19T08:34:22.936Z",
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"dateUpdated": "2026-08-05T11:30:28.316Z"
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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": "2026-08-05T11:30:28.316Z"
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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\nsmb: client: fix potential UAF in smb2_is_valid_lease_break()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF."
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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:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - The vulnerable loop is entered only from `cifs_demultiplex_thread()` processing an unsolicited SMB2 lease-break frame received from the remote SMB server over TCP/445, which routinely traverses the internet (e.g. Azure Files and other cloud SMB shares). A malicious or compromised server, or an on-path attacker injecting into the stream, delivers the trigger entirely as network data.\nAC:L - The attacker controls both sides of the race — it forces session teardown (session-expired/user-session-deleted status codes, TCP reset driving reconnect, DFS IPC churn) and then floods lease-break notifications — and it can stall the SMB2 LOGOFF reply so the session lingers in SES_EXITING on `smb_ses_list` for the entire request timeout, making the window arbitrarily wide and repeatable.\nPR:N - Unsolicited oplock/lease-break frames bypass `smb2_verify_signature()` entirely and the handler ignores SessionId/TreeId, matching only on the attacker-supplied LeaseKey, so no credentials on the client and no authenticated SMB session are needed to reach the vulnerable traversal.\nUI:N - In the realistic deployment — a persistent cifs mount from fstab, autofs, or a container volume — the connection already exists, and the compromised server or on-path injector triggers the code path with no action from any local user.\nS:U - The use-after-free corrupts kernel heap memory belonging to the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Walking a torn-down session's `tcon_list` and `pending_opens` dereferences freed slab objects whose contents the attacker can groom via heap spraying, turning `tcon->cfids`, `open->tlink`, and `open->lease_key` into attacker-influenced pointers that yield a kernel memory read primitive.\nI:H - The path writes into the freed memory — `spin_lock(&tcon->open_file_lock)`, `cifs_stats_inc()` counter increments, and `cifs_get_tlink()` refcount bumps — and later frees/queues work (`queue_work(cifsiod_wq, &cfid->lease_break)`) through sprayed pointers, giving heap corruption and control-flow hijacking potential.\nA:H - Dereferencing freed `cifs_ses`/`cifs_tcon` state from the demultiplex kernel thread readily produces an oops or panic, and because the trigger is a repeatable unauthenticated network frame the attacker can crash the client at will."
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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/client/smb2misc.c"
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],
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"versions": [
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{
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"version": "7f48558e6489d032b1584b0cc9ac4bb11072c034",
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"lessThan": "c868cabdf6fdd61bea54532271f4708254e57fc5",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "f92739fdd4522c4291277136399353d7c341fae4",
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"status": "affected",
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"lessThan": "705c76fbf726c7a2f6ff9143d4013b18daaaebf1",
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"status": "affected",
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},
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{
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"version": "a67172a013953664b1dad03c648200c70b90506c",
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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": "3.12.48",
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"lessThan": "3.13",
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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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"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/client/smb2misc.c"
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],
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"versions": [
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{
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"version": "3.13",
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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": "3.13",
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"status": "unaffected",
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},
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{
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"version": "6.1.85",
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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": "6.6.26",
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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": "6.8.5",
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"lessThanOrEqual": "6.8.*",
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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": "6.9",
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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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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "6.1.85"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"url": "https://git.kernel.org/stable/c/c868cabdf6fdd61bea54532271f4708254e57fc5"
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"url": "https://git.kernel.org/stable/c/f92739fdd4522c4291277136399353d7c341fae4"
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"url": "https://git.kernel.org/stable/c/a8344e2b69bde63f713b0aa796d70dbeadffddfb"
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}
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"title": "smb: client: fix potential UAF in smb2_is_valid_lease_break()",
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