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CVE-2022-49058 (GCVE-0-2022-49058)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-08-05 08:53
VLAI
Title
cifs: potential buffer overflow in handling symlinks
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: potential buffer overflow in handling symlinks Smatch printed a warning: arch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error: __memcpy() 'dctx->buf' too small (16 vs u32max) It's caused because Smatch marks 'link_len' as untrusted since it comes from sscanf(). Add a check to ensure that 'link_len' is not larger than the size of the 'link_str' buffer.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:50 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 3e582749e742e662a8e9bb37cffac62dccaaa1e2 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 1316c28569a80ab3596eeab05bf5e01991e7e739 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < eb5f51756944735ac70cd8bb38637cc202e29c91 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 22d658c6c5affed10c8907e67160cef0b6c92186 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 4e166a41180be2f1e66bbb6d46448e80a9a5ec05 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 9901b07ba42b39266b34a888e48d7306fd707bee (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 515e7ba11ef043d6febe69389949c8ef5f25e9d0 (git)
Affected: c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 , < 64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 4.9.311 , ≤ 4.9.* (semver)
Unaffected: 4.14.276 , ≤ 4.14.* (semver)
Unaffected: 4.19.239 , ≤ 4.19.* (semver)
Unaffected: 5.4.190 , ≤ 5.4.* (semver)
Unaffected: 5.10.112 , ≤ 5.10.* (semver)
Unaffected: 5.15.35 , ≤ 5.15.* (semver)
Unaffected: 5.17.4 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: potential buffer overflow in handling symlinks\n\nSmatch printed a warning:\n\tarch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error:\n\t__memcpy() \u0027dctx-\u003ebuf\u0027 too small (16 vs u32max)\n\nIt\u0027s caused because Smatch marks \u0027link_len\u0027 as untrusted since it comes\nfrom sscanf(). Add a check to ensure that \u0027link_len\u0027 is not larger than\nthe size of the \u0027link_str\u0027 buffer."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cifs: desbordamiento de b\u00fafer potencial al manejar enlaces simb\u00f3licos Smatch imprimi\u00f3 una advertencia: arch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error: __memcpy() \u0027dctx-\u0026gt;buf\u0027 demasiado peque\u00f1o (16 vs u32max) Esto se debe a que Smatch marca \u0027link_len\u0027 como no confiable ya que proviene de sscanf(). Agregue una verificaci\u00f3n para asegurarse de que \u0027link_len\u0027 no sea m\u00e1s grande que el tama\u00f1o del b\u00fafer \u0027link_str\u0027."
          }
        ],
        "id": "CVE-2022-49058",
        "lastModified": "2026-08-04T10:17:32.710",
        "metrics": {
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              "cvssData": {
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                "confidentialityImpact": "HIGH",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-08-04T19:44:51+00:00",
      "cve": "CVE-2022-49058",
      "id": "CVE-2022-49058",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "808",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cifs: potential buffer overflow in handling symlinks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49058.json",
      "version": "3"
    },
    "vulnrichment": {
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                  "confidentialityImpact": "HIGH",
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                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
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                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
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                  "content": {
                    "id": "CVE-2022-49058",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:50:01.997451Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-120",
                    "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T16:03:29.276Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
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              "vendor": "Linux",
              "versions": [
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                  "version": "2.6.37"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "4.9.311",
                  "versionType": "semver"
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                  "version": "4.14.276",
                  "versionType": "semver"
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                  "version": "5.4.190",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "5.18",
                  "versionType": "original_commit_for_fix"
                }
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          ],
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: potential buffer overflow in handling symlinks\n\nSmatch printed a warning:\n\tarch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error:\n\t__memcpy() \u0027dctx-\u003ebuf\u0027 too small (16 vs u32max)\n\nIt\u0027s caused because Smatch marks \u0027link_len\u0027 as untrusted since it comes\nfrom sscanf(). Add a check to ensure that \u0027link_len\u0027 is not larger than\nthe size of the \u0027link_str\u0027 buffer."
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              "scenarios": [
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                  "value": "AV:N - The attacker-controlled MF symlink payload is delivered over SMB as remote file contents and parsed in the CIFS client (query_mf_symlink/check_mf_symlink \u2192 parse_mf_symlink), so a malicious or compromised file server triggers the bug across the network.\nAC:L - A crafted 1067-byte MF symlink with an sscanf-derived link_len above 1024 (up to 9999 via %04u) deterministically drives crypto_shash_update/kstrndup past the in-buffer link_str; no race or layout luck is required.\nPR:N - The attacker only needs to operate or impersonate the SMB endpoint; no credentials or privileges on the victim client are required for the server to return the malicious object.\nUI:N - In the worst reasonable deployment (cifsroot defaults include mfsymlinks; fstab/autofs/container shares), ordinary client lookup/revalidate/get_link activity on an already-mounted share parses the planted object with no exploit-time victim action.\nS:U - The heap over-read and any resulting oops stay within the host kernel CIFS client authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - parse_mf_symlink feeds an attacker-chosen link_len into hashing/string duplication over link_str, over-reading up to ~9KB past the kmalloc object; that is a large OOB read and can surface heap bytes via kstrndup if the MD5 check is satisfied.\nI:N - The defect is an out-of-bounds read of server-supplied symlink bytes into MD5/kstrndup paths, not an out-of-bounds write or control-flow corruption primitive, matching other SMB client OOB-read symlink parses.\nA:H - Reading thousands of bytes past a 1067-byte allocation can fault unmapped heap and oops the kernel, and a malicious server can trigger the malformed object repeatedly on path access."
                }
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            "dateUpdated": "2026-08-05T08:53:40.101Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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        "datePublished": "2025-02-26T01:54:29.195Z",
        "dateReserved": "2025-02-26T01:49:39.243Z",
        "dateUpdated": "2026-08-05T08:53:40.101Z",
        "state": "PUBLISHED"
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  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.