Vulnerability-Lookup

FKIE_CVE-2026-64598

Vulnerability from fkie_nvd - Published: 2026-08-06 08:16 - Updated: 2026-08-08 15:16

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: smb/client: Fix error code in smb2_aead_req_alloc() The "*num_sgs" variable is a u32 so "ERR_PTR(*num_sgs)" doesn't work. We would have to do something similar to the previous line where it's cast to int and then long. However, it's simpler to store the return in an int ret variable. This bug would eventually result in a crash when dereference the invalid error pointer.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/aa37f5fef78dd11cbf983269da2031e12625c56d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa37f5fef78dd11cbf983269da2031e12625c56d",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "cad756733dc3985188983f3e2eb77e2927209099",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "a187883cc1dc784a4d32537f5d316f1b7b9ad76f",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "61f28012e5650c619223decdb7970e0d3162e949",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: Fix error code in smb2_aead_req_alloc()\n\nThe \"*num_sgs\" variable is a u32 so \"ERR_PTR(*num_sgs)\" doesn\u0027t work.\nWe would have to do something similar to the previous line where it\u0027s\ncast to int and then long.  However, it\u0027s simpler to store the return in\nan int ret variable.\n\nThis bug would eventually result in a crash when dereference the invalid\nerror pointer."
    }
  ],
  "id": "CVE-2026-64598",
  "lastModified": "2026-08-08T15:16:34.443",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-06T08:16:35.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aa37f5fef78dd11cbf983269da2031e12625c56d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-64598 (GCVE-0-2026-64598)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:13 – Updated: 2026-08-08 15:13

Title

smb/client: Fix error code in smb2_aead_req_alloc()

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/aa37f5fef78dd11cb…
https://git.kernel.org/stable/c/cad756733dc398518…
https://git.kernel.org/stable/c/a187883cc1dc784a4…
https://git.kernel.org/stable/c/a1cc432cb0b0a1f74…
https://git.kernel.org/stable/c/61f28012e5650c619…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < aa37f5fef78dd11cbf983269da2031e12625c56d (git) Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < cad756733dc3985188983f3e2eb77e2927209099 (git) Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < a187883cc1dc784a4d32537f5d316f1b7b9ad76f (git) Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac (git) Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 61f28012e5650c619223decdb7970e0d3162e949 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa37f5fef78dd11cbf983269da2031e12625c56d",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "cad756733dc3985188983f3e2eb77e2927209099",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "a187883cc1dc784a4d32537f5d316f1b7b9ad76f",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "61f28012e5650c619223decdb7970e0d3162e949",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: Fix error code in smb2_aead_req_alloc()\n\nThe \"*num_sgs\" variable is a u32 so \"ERR_PTR(*num_sgs)\" doesn\u0027t work.\nWe would have to do something similar to the previous line where it\u0027s\ncast to int and then long.  However, it\u0027s simpler to store the return in\nan int ret variable.\n\nThis bug would eventually result in a crash when dereference the invalid\nerror pointer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The buggy smb2_aead_req_alloc()/crypt_message() path runs in the in-kernel SMB3 client during encrypted transform processing over an SMB network session; the highest-severity scenario is a client mounting and using an untrusted or malicious SMB3 encrypted share.\nAC:L - When cifs_get_num_sgs() returns a negative errno, the u32 truncation makes ERR_PTR() bypass IS_ERR() deterministically on 64-bit, and the subsequent sg_init_marker()/pointer use crashes without requiring an attacker-uncontrollable race or memory layout.\nPR:N - The attacking SMB endpoint or network adversary needs no privileges or account on the victim client; client-side credentials used to mount the share are a victim condition, not attacker privileges.\nUI:R - A victim must mount or otherwise use an SMB3 share with encryption so the client encrypt/decrypt AEAD allocation path runs; per CVSS guidance, mounting a filesystem is user interaction.\nS:U - The invalid error-pointer dereference and resulting kernel memory access remain within the client kernel\u0027s security authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - IS_ERR() failure leads to wild pointer use (uninitialized AEAD/sg state and invalid creq), which under the required uncertainty rule is treated as a high-impact kernel memory disclosure primitive rather than a pure non-leaking crash.\nI:H - The same path performs a wild write via sg_mark_end() on a bogus scatterlist address and may later kfree_sensitive() an invalid pointer, yielding kernel memory corruption; under uncertainty this is scored as high integrity impact.\nA:H - The commit-documented result is a kernel crash from dereferencing the invalid error pointer; sg_init_marker() on a NULL sgl with a huge truncated nents count causes a reliable oops/panic DoS."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-08T15:13:28.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa37f5fef78dd11cbf983269da2031e12625c56d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099"
        },
        {
          "url": "https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949"
        }
      ],
      "title": "smb/client: Fix error code in smb2_aead_req_alloc()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64598",
    "datePublished": "2026-08-06T07:13:52.716Z",
    "dateReserved": "2026-07-19T15:36:31.799Z",
    "dateUpdated": "2026-08-08T15:13:28.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-64598

CVE-2026-64598 (GCVE-0-2026-64598)

Tags

Sightings

Nomenclature