CVE-2026-45972 (GCVE-0-2026-45972)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-10-19 19:26
VLAI
Title
smb: client: fix potential UAF and double free in smb2_open_file()
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:18 UTC
CWE
  • CWE-825 - Expired Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 743f70406264348c0830f38409eb6c40a42fb2db , < 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 (git)
Affected: 3a6d6b332f92990958602c1e35ce0173e2dd62e9 , < 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151 (git)
Affected: b64e3b5d8d759dd4333992e4ba4dadf9359952c8 , < 4d339b219004869e96c4ce56b8891f83a38da4c0 (git)
Affected: 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 , < e66dcf7bb9c4df5582c82bc3582725abcbfbea73 (git)
Affected: e3a43633023e3cacaca60d4b8972d084a2b06236 , < 639deb962986ef2f5e2a6d5a600c66f922471e81 (git)
Affected: e3a43633023e3cacaca60d4b8972d084a2b06236 , < ebbbc4bfad4cb355d17c671223d0814ee3ef4eda (git)
Affected: 6.1.163 , < 6.1.165 (semver)
Affected: 6.6.124 , < 6.6.128 (semver)
Affected: 6.12.70 , < 6.12.75 (semver)
Affected: 6.18.10 , < 6.18.14 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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                },
                {
                  "lessThanOrEqual": "6.19.*",
                  "status": "unaffected",
                  "version": "6.19.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.165",
                      "versionStartIncluding": "6.1.163",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.128",
                      "versionStartIncluding": "6.6.124",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.75",
                      "versionStartIncluding": "6.12.70",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.14",
                      "versionStartIncluding": "6.18.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19.4",
                      "versionStartIncluding": "6.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0",
                      "versionStartIncluding": "6.19",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF and double free in smb2_open_file()\n\nZero out @err_iov and @err_buftype before retrying SMB2_open() to\nprevent an UAF bug if @data != NULL, otherwise a double free."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The flaw is in the in-kernel SMB/CIFS client and is triggered entirely by SMB2 responses received over the network (TCP/445) from a malicious/compromised server or a network MITM; the attacker is a remote network peer.\nAC:L - The server fully controls both sides of the trigger \u2014 returning EACCES-with-buffer on the first open and success on the retry \u2014 and the vulnerable retry path is exercised by ordinary write-mode opens, so it is reliably triggerable with no attacker-uncontrolled condition or race.\nPR:N - The attacker is the remote SMB server (or MITM) and needs no authentication or privileges on the victim client; the malicious responses are delivered before/independent of any client-side credential check.\nUI:N - In the most severe reasonable deployment (a persistent/automounted share to a compromised or MITM\u0027d server), routine background file opens drive the vulnerable retry with no dedicated user action at exploit time.\nS:U - The corruption stays within the kernel\u0027s slab allocator and the kernel\u0027s own security authority; no crossing of a VM, sandbox, or IOMMU boundary occurs.\nC:H - The use-after-free reads attacker-influenceable freed/reallocated buffer contents (hdr-\u003eStatus and symlink parsing), and combined with heap grooming a UAF yields arbitrary kernel memory disclosure.\nI:H - A controlled double-free plus UAF are classic primitives for heap manipulation and arbitrary write, enabling control-flow hijacking and kernel code execution.\nA:H - The UAF/double-free corrupts slab state and reliably causes kernel oops/panic, fully compromising availability."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:28:59.625Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74"
            },
            {
              "url": "https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151"
            },
            {
              "url": "https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0"
            },
            {
              "url": "https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73"
            },
            {
              "url": "https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81"
            },
            {
              "url": "https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda"
            }
          ],
          "title": "smb: client: fix potential UAF and double free in smb2_open_file()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-45972",
        "datePublished": "2026-05-27T12:18:31.500Z",
        "dateReserved": "2026-05-13T15:03:33.090Z",
        "dateUpdated": "2026-10-19T19:26:40.861Z",
        "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.