Vulnerability-Lookup

GHSA-PV3W-35GF-CP37

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

vt: stabilize tty reference in kbd_keycode with tty_port_tty_get

kbd_keycode() reads vc->port.tty without acquiring a tty reference, racing against con_shutdown() which clears port.tty under a different lock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference for the duration the tty pointer is needed.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74675"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:41Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvt: stabilize tty reference in kbd_keycode with tty_port_tty_get\n\nkbd_keycode() reads vc-\u003eport.tty without acquiring a tty reference,\nracing against con_shutdown() which clears port.tty under a different\nlock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference\nfor the duration the tty pointer is needed.",
  "id": "GHSA-pv3w-35gf-cp37",
  "modified": "2026-08-25T06:31:27Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74675"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38400673c9bfb39cfc87539e1a072087e98f4e4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38a0aa593ebc275aea6f79534d07f44e43768ce6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f6b1d3fcfc26dc3fc85262f753439df93b055b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b664592e9ba8c47c9e23408db7ba52eb9f946c8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b84fd400f80adf4d1c88fbce50ae1cf2f8119e65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cab5a342f0589334046741006d8a280514f94235"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc4a1a2ce0c58eafd477effb055863935260ddc1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e25d47a526939ad44b75f778b8a7500562b84fc1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74675 (GCVE-0-2026-74675)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41

Title

vt: stabilize tty reference in kbd_keycode with tty_port_tty_get

Summary

In the Linux kernel, the following vulnerability has been resolved: vt: stabilize tty reference in kbd_keycode with tty_port_tty_get kbd_keycode() reads vc->port.tty without acquiring a tty reference, racing against con_shutdown() which clears port.tty under a different lock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference for the duration the tty pointer is needed.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b84fd400f80adf4d1…
https://git.kernel.org/stable/c/38400673c9bfb39cf…
https://git.kernel.org/stable/c/cab5a342f05893340…
https://git.kernel.org/stable/c/38a0aa593ebc275ae…
https://git.kernel.org/stable/c/3f6b1d3fcfc26dc3f…
https://git.kernel.org/stable/c/b664592e9ba8c47c9…
https://git.kernel.org/stable/c/cc4a1a2ce0c58eafd…
https://git.kernel.org/stable/c/e25d47a526939ad44…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b84fd400f80adf4d1c88fbce50ae1cf2f8119e65 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 38400673c9bfb39cfc87539e1a072087e98f4e4f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cab5a342f0589334046741006d8a280514f94235 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 38a0aa593ebc275aea6f79534d07f44e43768ce6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3f6b1d3fcfc26dc3fc85262f753439df93b055b4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b664592e9ba8c47c9e23408db7ba52eb9f946c8a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cc4a1a2ce0c58eafd477effb055863935260ddc1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e25d47a526939ad44b75f778b8a7500562b84fc1 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/vt/keyboard.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b84fd400f80adf4d1c88fbce50ae1cf2f8119e65",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "38400673c9bfb39cfc87539e1a072087e98f4e4f",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "cab5a342f0589334046741006d8a280514f94235",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "38a0aa593ebc275aea6f79534d07f44e43768ce6",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "3f6b1d3fcfc26dc3fc85262f753439df93b055b4",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b664592e9ba8c47c9e23408db7ba52eb9f946c8a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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            {
              "lessThan": "e25d47a526939ad44b75f778b8a7500562b84fc1",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
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        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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": "5.10.265",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvt: stabilize tty reference in kbd_keycode with tty_port_tty_get\n\nkbd_keycode() reads vc-\u003eport.tty without acquiring a tty reference,\nracing against con_shutdown() which clears port.tty under a different\nlock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference\nfor the duration the tty pointer is needed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through local virtual-console and input paths: kbd_keycode runs from the VT keyboard input handler on key/key-repeat events while con_shutdown runs during final close(2) on /dev/ttyN; there is no network, Bluetooth-only, or remote-protocol reachability to both sides of the race.\nAC:L - The attacker controls both race participants: one thread can loop open/close a console tty to drive release_tty/con_shutdown while another holds a key for repeat events (down==2) or injects EV_KEY via uinput, retrying until kbd_keycode uses a freed tty_struct.\nPR:L - No real-root capability is required; a console-logged-in user with normal DAC access to /dev/ttyN (typical tty-group membership) can close their VT tty and generate foreground key events, and vt_ioctl grants perm to the controlling-tty owner without CAP_SYS_TTY_CONFIG.\nUI:N - The attacker performs every step from its own console session\u2014opening/closing the VT tty and generating key or key-repeat input\u2014so no separate victim or administrator action is required.\nS:U - The slab use-after-free corrupts kernel heap memory within the same kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After the tty is freed, kbd_keycode reads freed tty_struct fields (termios for L_ECHO and optionally tty-\u003eops via tty_chars_in_buffer), giving a use-after-free read primitive and enabling disclosure of kernel memory once the slab object is reclaimed.\nI:H - The path writes tty-\u003edriver_data on a freed tty_struct and may indirect-call through tty-\u003eops in tty_chars_in_buffer, enabling heap spray and control-flow hijack for arbitrary kernel modification or privilege escalation.\nA:H - Use-after-free on tty_struct reliably produces kernel oops or panic on illegal dereference through freed memory, and the open/close versus key-repeat race can be retriggered at will for repeatable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:27.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b84fd400f80adf4d1c88fbce50ae1cf2f8119e65"
        },
        {
          "url": "https://git.kernel.org/stable/c/38400673c9bfb39cfc87539e1a072087e98f4e4f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cab5a342f0589334046741006d8a280514f94235"
        },
        {
          "url": "https://git.kernel.org/stable/c/38a0aa593ebc275aea6f79534d07f44e43768ce6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f6b1d3fcfc26dc3fc85262f753439df93b055b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b664592e9ba8c47c9e23408db7ba52eb9f946c8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc4a1a2ce0c58eafd477effb055863935260ddc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/e25d47a526939ad44b75f778b8a7500562b84fc1"
        }
      ],
      "title": "vt: stabilize tty reference in kbd_keycode with tty_port_tty_get",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74675",
    "datePublished": "2026-08-22T15:32:44.493Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
    "dateUpdated": "2026-08-25T05:41:27.811Z",
    "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.

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.

Related by attack behaviour

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