CVE-2021-46960 (GCVE-0-2021-46960)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:46 – Updated: 2026-08-05 08:45
VLAI
Title
cifs: Return correct error code from smb2_get_enc_key
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: Return correct error code from smb2_get_enc_key Avoid a warning if the error percolates back up: [440700.376476] CIFS VFS: \\otters.example.com crypt_message: Could not get encryption key [440700.386947] ------------[ cut here ]------------ [440700.386948] err = 1 [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 ... [440700.397304] CPU: 11 PID: 2733 Comm: tar Tainted: G OE 5.4.0-70-generic #78~18.04.1-Ubuntu ... [440700.397334] Call Trace: [440700.397346] __filemap_set_wb_err+0x1a/0x70 [440700.397419] cifs_writepages+0x9c7/0xb30 [cifs] [440700.397426] do_writepages+0x4b/0xe0 [440700.397444] __filemap_fdatawrite_range+0xcb/0x100 [440700.397455] filemap_write_and_wait+0x42/0xa0 [440700.397486] cifs_setattr+0x68b/0xf30 [cifs] [440700.397493] notify_change+0x358/0x4a0 [440700.397500] utimes_common+0xe9/0x1c0 [440700.397510] do_utimes+0xc5/0x150 [440700.397520] __x64_sys_utimensat+0x88/0xd0
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:01 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < e94851629c49c65b4fbb29a5725ddfd7988f8f20 (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < e486f8397f3f14a7cadc166138141fdb14379a54 (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < 93f3339b22ba17e66f0808737467b70ba087eaec (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < aaa0faa5c28a91c362352d6b35dc3ed10df56fb0 (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < f59a9242942fef0de7b926e438ba4eae65d4b4dd (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < b399c1a3ea0b9d10047ff266d65533df7f15532f (git)
Affected: 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 , < 83728cbf366e334301091d5b808add468ab46b27 (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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                  "content": {
                    "id": "CVE-2021-46960",
                    "options": [
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              "versions": [
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                  "versionType": "original_commit_for_fix"
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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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                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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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\u2019s 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\u2019s 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\u2014only mis-handled error return leading to crash/WARN\u2014so integrity is unaffected.\nA:H - Returning 1 is treated as success by cifs_demultiplex_thread (which only rejects length \u003c 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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        "cveId": "CVE-2021-46960",
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}



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