329 lines
18 KiB
JSON
329 lines
18 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-2026-98175",
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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": "2026-09-25T10:25:14.322Z",
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"datePublished": "2026-10-06T08:44:19.155Z",
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"dateUpdated": "2026-10-19T09:15:06.742Z"
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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": "2026-10-19T09:15:06.742Z"
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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: cancel reconnect work in clean_demultiplex_info()\n\nclean_demultiplex_info() cancels server->echo delayed work but not\nserver->reconnect, which can cause a use-after-free when the\ndemultiplex thread exits while a reconnect work is still queued:\n\n cifs_demultiplex_thread()\n cifs_readv_from_socket()\n cifs_reconnect()\n __cifs_reconnect()\n cifs_queue_server_reconn()\n mod_delayed_work(cifsiod_wq, &server->reconnect, 0)\n clean_demultiplex_info()\n cancel_delayed_work_sync(&server->echo) // echo canceled\n // reconnect NOT canceled\n kfree_sensitive(server) // server freed\n\n ...later, on cifsiod_wq:\n\n smb2_reconnect_server()\n server->srv_count // UAF read of freed server\n\nFix this by canceling server->reconnect delayed work in\nclean_demultiplex_info() before the server is freed, the same way\ncifs_put_tcp_session() already does."
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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:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.5,
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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 - The SMB server at the other end of the client's TCP connection triggers the bug. When it resets the connection or sends an oversized SMB response, cifs_demultiplex_thread() calls cifs_reconnect() and then __cifs_reconnect(), which queues server->reconnect via cifs_queue_server_reconn(). clean_demultiplex_info() then frees the server without cancelling that work.\nAC:H - The malicious server can force reconnects whenever it likes. The free, though, only happens when the client drops its last TCP session reference (umount or a session put, via cifs_put_tcp_session) inside the window where __cifs_reconnect has re-queued the reconnect work. Then smb2_reconnect_server must run after kfree(server). The server cannot produce that client-side timing on demand.\nPR:N - A remote SMB server needs no credentials on the client host to drop its own connection or send a malformed response that drives the client into __cifs_reconnect. Mounting locally is not a lower-privilege route: cifs_fs_type has no FS_USERNS_MOUNT, so a local attacker would need real CAP_SYS_ADMIN.\nUI:R - The client has to mount a share from the attacker's SMB server, and a demultiplex thread only exists after that mount. The free also needs the client to unmount or otherwise drop the session at the wrong moment.\nS:U - The freed struct TCP_Server_Info and the cifsiod_wq worker that uses it after free are both in the client kernel. No VM, IOMMU or sandbox boundary is crossed.\nC:H - smb2_reconnect_server() reads server->srv_count from the freed TCP_Server_Info. If a reallocated object puts a nonzero value there, the worker carries on and dereferences primary_server, the reconnect_mutex and the session lists, all of which a heap spray would control.\nI:H - With a nonzero srv_count in reclaimed memory, the worker increments it, takes reconnect_mutex, manipulates the ses and tcon lists and calls cifs_put_tcp_session on the stale pointer. Those are writes through attacker-shaped memory, so they can corrupt kernel data.\nA:H - syzbot reproduced this use-after-free of TCP_Server_Info in smb2_reconnect_server. A stale worker running on the shared cifsiod_wq workqueue can oops or panic the client kernel."
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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": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
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"lessThan": "180380272f116dbd2b0354c5c7872e112e519149",
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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": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
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"lessThan": "e3f6a779433d13aafb5edab59e4f9313051e8a52",
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"status": "affected",
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},
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{
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"version": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
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"lessThan": "7ab9ceedd860216fb97f2d8574cbe58b8906f42a",
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"status": "affected",
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},
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{
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"version": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
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"lessThan": "2e5103e11a17c274715dd56cf185eeedccf686b8",
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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": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
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"lessThan": "c65eae6f61d1778ff7a82e4aae4080e26f486af1",
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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": "e008a962311a875a828cbae54b43285858aaa6c8",
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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": "123b228a09b90b50b0a9d6eb8294cf0c42efc029",
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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": "0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9",
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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": "d0d2a4c82942e2f51e4984beea1f7e5a994bd06c",
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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": "15a12fbbf365a483b1c19f9caeb707b3bea77e10",
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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": "f0b715409cb9cf7e21e690f9b163047739761962",
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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": "ff04da387c10b6bf7b510392742c8cd46c130fd6",
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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": "48f9526f4dcb4b132fe0dc2450835311e3b013a6",
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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": "3.10.107",
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"lessThan": "3.11",
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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": "3.12.70",
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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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"version": "3.16.42",
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"lessThan": "3.17",
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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": "3.18.47",
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"lessThan": "3.19",
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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": "4.1.38",
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"lessThan": "4.2",
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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": "4.4.40",
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"lessThan": "4.5",
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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": "4.8.16",
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"lessThan": "4.9",
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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": "4.9.1",
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"lessThan": "4.10",
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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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"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/connect.c"
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],
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"versions": [
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{
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"version": "4.10",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "4.10",
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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": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.112",
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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": "6.18.54",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52"
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},
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{
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"url": "https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a"
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},
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{
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"url": "https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8"
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},
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{
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"url": "https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1"
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}
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],
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"title": "smb: client: cancel reconnect work in clean_demultiplex_info()",
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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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} |