329 lines
16 KiB
JSON
329 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveId": "CVE-2021-46960",
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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": "2024-02-27T18:42:55.941Z",
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"datePublished": "2024-02-27T18:46:59.919Z",
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"dateUpdated": "2026-08-05T08:45:14.917Z"
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Return correct error code from smb2_get_enc_key\n\nAvoid a warning if the error percolates back up:\n\n[440700.376476] CIFS VFS: \\\\otters.example.com crypt_message: Could not get encryption key\n[440700.386947] ------------[ cut here ]------------\n[440700.386948] err = 1\n[440700.386977] WARNING: CPU: 11 PID: 2733 at /build/linux-hwe-5.4-p6lk6L/linux-hwe-5.4-5.4.0/lib/errseq.c:74 errseq_set+0x5c/0x70\n...\n[440700.397304] CPU: 11 PID: 2733 Comm: tar Tainted: G OE 5.4.0-70-generic #78~18.04.1-Ubuntu\n...\n[440700.397334] Call Trace:\n[440700.397346] __filemap_set_wb_err+0x1a/0x70\n[440700.397419] cifs_writepages+0x9c7/0xb30 [cifs]\n[440700.397426] do_writepages+0x4b/0xe0\n[440700.397444] __filemap_fdatawrite_range+0xcb/0x100\n[440700.397455] filemap_write_and_wait+0x42/0xa0\n[440700.397486] cifs_setattr+0x68b/0xf30 [cifs]\n[440700.397493] notify_change+0x358/0x4a0\n[440700.397500] utimes_common+0xe9/0x1c0\n[440700.397510] do_utimes+0xc5/0x150\n[440700.397520] __x64_sys_utimensat+0x88/0xd0"
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"value": "AV:N - smb2_get_enc_key runs in the CIFS/SMB3 client demultiplex path on transform PDUs from a remote TCP peer; a malicious or compromised SMB server can send a large encrypted PDU with an unknown SessionId and drive the buggy positive return over the network.\nAC:L - The server fully controls SessionId and PDU size, so key lookup failure and the subsequent positive error return are deterministic with no race or other condition outside the attacker’s control.\nPR:N - The remote SMB peer needs no credentials or privileges on the client; transform receive and smb2_get_enc_key perform no capability checks before the bad return.\nUI:N - Once an SMB3 mount exists (common fstab/automount deployment), the server triggers the bug solely by sending crafted transform responses with no further victim action.\nS:U - Impact is confined to the client kernel’s SMB stack and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The flaw is a wrong positive errno that leads to a NULL dereference / WARN path; it does not provide a memory-disclosure primitive.\nI:N - There is no attacker-controlled write or memory corruption—only mis-handled error return leading to crash/WARN—so integrity is unaffected.\nA:H - Returning 1 is treated as success by cifs_demultiplex_thread (which only rejects length < 0), so receive_encrypted_read failure leaves num_mids=1 with NULL mid/buf and hits smb2_add_credits_from_hdr/cifs_dump_mem NULL derefs (kernel oops); the encrypt/writeback path also WARNs in errseq_set and panics under panic_on_warn."
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