Vulnerability-Lookup

GSD-2021-46960

Vulnerability from gsd - Updated: 2024-02-28 06:03

Details

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

Aliases

CVE-2021-46960

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-46960"
      ],
      "details": "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",
      "id": "GSD-2021-46960",
      "modified": "2024-02-28T06:03:57.860364Z",
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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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            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cifs: devuelve el c\u00f3digo de error correcto de smb2_get_enc_key Evite una advertencia si el error se repite: [440700.376476] CIFS VFS: \\\\otters.example.com crypt_message: no se pudo obtener la clave de cifrado [440700.386947] ------------[ cortar aqu\u00ed ]------------ [440700.386948] err = 1 [440700.386977] ADVERTENCIA: CPU: 11 PID: 2733 en / 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 Contaminado: G OE 5.4.0-70-generic #78~18.04.1-Ubuntu... [440700.397334] Seguimiento de llamadas: [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] [440700.39749 3] notify_change+0x358/0x4a0 [440700.397500] utimes_common+0xe9/0x1c0 [440700.397510] do_utimes+ 0xc5/0x150 [440700.397520] __x64_sys_utimensat+0x88/0xd0"
          }
        ],
        "id": "CVE-2021-46960",
        "lastModified": "2024-02-28T14:06:45.783",
        "metrics": {},
        "published": "2024-02-27T19:04:06.860",
        "references": [
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            "url": "https://git.kernel.org/stable/c/83728cbf366e334301091d5b808add468ab46b27"
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            "url": "https://git.kernel.org/stable/c/e486f8397f3f14a7cadc166138141fdb14379a54"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e94851629c49c65b4fbb29a5725ddfd7988f8f20"
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            "url": "https://git.kernel.org/stable/c/f59a9242942fef0de7b926e438ba4eae65d4b4dd"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
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  }
}

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

Vulnerability from cvelistv5 – Published: 2024-02-27 18:46 – Updated: 2026-08-05 08:45

Title

cifs: Return correct error code from smb2_get_enc_key

Summary

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

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/e94851629c49c65b4…
https://git.kernel.org/stable/c/e486f8397f3f14a7c…
https://git.kernel.org/stable/c/93f3339b22ba17e66…
https://git.kernel.org/stable/c/aaa0faa5c28a91c36…
https://git.kernel.org/stable/c/f59a9242942fef0de…
https://git.kernel.org/stable/c/b399c1a3ea0b9d100…
https://git.kernel.org/stable/c/83728cbf366e33430…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.233",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.118",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.233",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.191",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.118",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.36",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.20",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.3",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "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\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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:45:14.917Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46960",
    "datePublished": "2024-02-27T18:46:59.919Z",
    "dateReserved": "2024-02-27T18:42:55.941Z",
    "dateUpdated": "2026-08-05T08:45:14.917Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

GSD-2021-46960

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

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Sightings

Nomenclature

Related by attack behaviour