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

Vulnerability from cvelistv5 – Published: 2026-08-06 07:13 – Updated: 2026-10-19 20:48
VLAI
Title
smb/client: Fix error code in smb2_aead_req_alloc()
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.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 2026-10-16 15:43 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6643 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < aa37f5fef78dd11cbf983269da2031e12625c56d (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < cad756733dc3985188983f3e2eb77e2927209099 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < a187883cc1dc784a4d32537f5d316f1b7b9ad76f (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 61f28012e5650c619223decdb7970e0d3162e949 (git)
guessed Create a notification for this product.
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 , ≤ * (original_commit_for_fix)
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                  "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",
                  "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",
                      "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": "2026-08-17T04:58:20.851Z",
            "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": "2026-10-19T20:48:43.611Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.