{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-46960", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.941Z", "datePublished": "2024-02-27T18:46:59.919Z", "dateUpdated": "2026-08-05T08:45:14.917Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:14.917Z" }, "descriptions": [ { "lang": "en", "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" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/smb2ops.c" ], "versions": [ { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "e94851629c49c65b4fbb29a5725ddfd7988f8f20", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "e486f8397f3f14a7cadc166138141fdb14379a54", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "93f3339b22ba17e66f0808737467b70ba087eaec", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "aaa0faa5c28a91c362352d6b35dc3ed10df56fb0", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "f59a9242942fef0de7b926e438ba4eae65d4b4dd", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "b399c1a3ea0b9d10047ff266d65533df7f15532f", "status": "affected", "versionType": "git" }, { "version": "61cfac6f267dabcf2740a7ec8a0295833b28b5f5", "lessThan": "83728cbf366e334301091d5b808add468ab46b27", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/smb2ops.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.233", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.191", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.118", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.36", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.11.20", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.12.3", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": 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"versionEndExcluding": "5.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e94851629c49c65b4fbb29a5725ddfd7988f8f20" }, { "url": "https://git.kernel.org/stable/c/e486f8397f3f14a7cadc166138141fdb14379a54" }, { "url": "https://git.kernel.org/stable/c/93f3339b22ba17e66f0808737467b70ba087eaec" }, { "url": "https://git.kernel.org/stable/c/aaa0faa5c28a91c362352d6b35dc3ed10df56fb0" }, { "url": "https://git.kernel.org/stable/c/f59a9242942fef0de7b926e438ba4eae65d4b4dd" }, { "url": "https://git.kernel.org/stable/c/b399c1a3ea0b9d10047ff266d65533df7f15532f" }, { "url": "https://git.kernel.org/stable/c/83728cbf366e334301091d5b808add468ab46b27" } ], "title": "cifs: Return correct error code from smb2_get_enc_key", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.896Z" }, "title": "CVE Program Container", "references": [ { "url": 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