273 lines
16 KiB
JSON
273 lines
16 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-2024-35870",
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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": "2024-05-17T13:50:33.108Z",
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"datePublished": "2024-05-19T08:34:28.419Z",
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"dateUpdated": "2026-08-05T11:30:32.619Z"
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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": "2026-08-05T11:30:32.619Z"
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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 UAF in smb2_reconnect_server()\n\nThe UAF bug is due to smb2_reconnect_server() accessing a session that\nis already being teared down by another thread that is executing\n__cifs_put_smb_ses(). This can happen when (a) the client has\nconnection to the server but no session or (b) another thread ends up\nsetting @ses->ses_status again to something different than\nSES_EXITING.\n\nTo fix this, we need to make sure to unconditionally set\n@ses->ses_status to SES_EXITING and prevent any other threads from\nsetting a new status while we're still tearing it down.\n\nThe following can be reproduced by adding some delay to right after\nthe ipc is freed in __cifs_put_smb_ses() - which will give\nsmb2_reconnect_server() worker a chance to run and then accessing\n@ses->ipc:\n\nkinit ...\nmount.cifs //srv/share /mnt/1 -o sec=krb5,nohandlecache,echo_interval=10\n[disconnect srv]\nls /mnt/1 &>/dev/null\nsleep 30\nkdestroy\n[reconnect srv]\nsleep 10\numount /mnt/1\n...\nCIFS: VFS: Verify user has a krb5 ticket and keyutils is installed\nCIFS: VFS: \\\\srv Send error in SessSetup = -126\nCIFS: VFS: Verify user has a krb5 ticket and keyutils is installed\nCIFS: VFS: \\\\srv Send error in SessSetup = -126\ngeneral protection fault, probably for non-canonical address\n0x6b6b6b6b6b6b6b6b: 0000 [#1] PREEMPT SMP NOPTI\nCPU: 3 PID: 50 Comm: kworker/3:1 Not tainted 6.9.0-rc2 #1\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39\n04/01/2014\nWorkqueue: cifsiod smb2_reconnect_server [cifs]\nRIP: 0010:__list_del_entry_valid_or_report+0x33/0xf0\nCode: 4f 08 48 85 d2 74 42 48 85 c9 74 59 48 b8 00 01 00 00 00 00 ad\nde 48 39 c2 74 61 48 b8 22 01 00 00 00 00 74 69 <48> 8b 01 48 39 f8 75\n7b 48 8b 72 08 48 39 c6 0f 85 88 00 00 00 b8\nRSP: 0018:ffffc900001bfd70 EFLAGS: 00010a83\nRAX: dead000000000122 RBX: ffff88810da53838 RCX: 6b6b6b6b6b6b6b6b\nRDX: 6b6b6b6b6b6b6b6b RSI: ffffffffc02f6878 RDI: ffff88810da53800\nRBP: ffff88810da53800 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: ffff88810c064000\nR13: 0000000000000001 R14: ffff88810c064000 R15: ffff8881039cc000\nFS: 0000000000000000(0000) GS:ffff888157c00000(0000)\nknlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fe3728b1000 CR3: 000000010caa4000 CR4: 0000000000750ef0\nPKRU: 55555554\nCall Trace:\n <TASK>\n ? die_addr+0x36/0x90\n ? exc_general_protection+0x1c1/0x3f0\n ? asm_exc_general_protection+0x26/0x30\n ? __list_del_entry_valid_or_report+0x33/0xf0\n __cifs_put_smb_ses+0x1ae/0x500 [cifs]\n smb2_reconnect_server+0x4ed/0x710 [cifs]\n process_one_work+0x205/0x6b0\n worker_thread+0x191/0x360\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xe2/0x110\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>"
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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 race is driven entirely by remote SMB server behavior — TCP disconnects, malformed/short responses, decryption failures, or withheld replies all reach `cifs_reconnect()` → `cifs_mark_tcp_ses_conns_for_reconnect()` from the demultiplex thread, and the freed tcon's contents are transmitted back over the network. A malicious/compromised SMB server or an on-path attacker against an existing CIFS mount exploits this remotely.\nAC:L - The attacker controls both sides: it triggers reconnect at will (RST/close/malformed frame) and observes the SMB2 LOGOFF request that `__cifs_put_smb_ses()` sends before blocking, giving an explicit on-wire marker for the teardown window, and the reconnect worker self-requeues every 2 s so the race can be retried indefinitely. In scenario (a) — server accepts TCP but fails SESSION_SETUP — `SES_EXITING` is never set at all, so no timing win is even required.\nPR:N - The attacker is the remote peer and needs no privileges or account on the victim client; valid SMB credentials are not required, since failed session setup is precisely what drives the vulnerable state.\nUI:N - The attack targets an already-established CIFS mount (fstab/autofs/Kubernetes-mounted shares on servers, NAS-backed embedded and industrial systems); reconnect and session teardown are triggered by the attacker and by background workers with no user action at attack time.\nS:U - Corruption is confined to kernel heap objects within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed IPC `cifs_tcon` is re-read and `tcon->tree_name` is sent to the attacker-controlled server in the TREE_CONNECT, leaking reclaimed kernel heap contents directly to the attacker, and the freed `cifs_ses` holds session keys and `auth_key.response`; the UAF read primitive is unbounded.\nI:H - `cifs_smb_ses_inc_refcount()` writes to freed memory and `list_del_init(&ses->smb_ses_list)` performs a `prev->next = next` write through pointers read from a freed, sprayable kmalloc object — a write-what-where primitive suitable for control-flow hijack.\nA:H - The bug reproducibly causes a general protection fault in the cifsiod kworker (`__list_del_entry_valid_or_report` on 0x6b6b6b6b poison), killing the worker and panicking the system on `panic_on_oops` configurations."
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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/connect.c"
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],
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"versions": [
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{
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"version": "b327a717e506980399464e304e363f94f95eb7a1",
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"lessThan": "755fe68cd4b59e1d2a2dd3286177fd4404f57fed",
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"status": "affected",
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"versionType": "git"
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{
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"fs/smb/client/connect.c"
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],
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"version": "4.16",
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"status": "affected"
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"version": "0",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.1.121",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.29",
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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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},
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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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"title": "smb: client: fix UAF in smb2_reconnect_server()",
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"type": "CWE",
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}
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"attackVector": "LOCAL",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
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"type": "ssvc",
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"content": {
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"timestamp": "2024-06-17T17:38:54.896093Z",
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"id": "CVE-2024-35870",
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"options": [
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"dateUpdated": "2024-10-27T14:02:11.836Z"
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}
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{
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"title": "CVE Program Container",
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"references": [
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} |