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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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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{
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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      "cpeApplicability": [
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                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "2.6.12",
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                  "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"
        },
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        {
          "url": "https://git.kernel.org/stable/c/e25d47a526939ad44b75f778b8a7500562b84fc1"
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      ],
      "title": "vt: stabilize tty reference in kbd_keycode with tty_port_tty_get",
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  "cveMetadata": {
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    "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"
  },
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  "dataVersion": "5.2",
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      "cve": "CVE-2026-74675",
      "date": "2026-08-29",
      "epss": "0.00129",
      "percentile": "0.02876"
    },
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      "current_release_date": "2026-08-24T14:51:19.000Z",
      "cve": "CVE-2026-74675",
      "id": "msrc_CVE-2026-74675",
      "initial_release_date": "2026-08-24T01:08:33.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vt: stabilize tty reference in kbd_keycode with tty_port_tty_get",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74675.json",
      "version": "2"
    },
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Use tty_port_tty_get()/tty_kref_put() to hold a proper reference\\nfor the duration the tty pointer is needed.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/vt/keyboard.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b84fd400f80adf4d1c88fbce50ae1cf2f8119e65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"38400673c9bfb39cfc87539e1a072087e98f4e4f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"cab5a342f0589334046741006d8a280514f94235\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"38a0aa593ebc275aea6f79534d07f44e43768ce6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3f6b1d3fcfc26dc3fc85262f753439df93b055b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b664592e9ba8c47c9e23408db7ba52eb9f946c8a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"cc4a1a2ce0c58eafd477effb055863935260ddc1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e25d47a526939ad44b75f778b8a7500562b84fc1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/vt/keyboard.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/38400673c9bfb39cfc87539e1a072087e98f4e4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/38a0aa593ebc275aea6f79534d07f44e43768ce6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f6b1d3fcfc26dc3fc85262f753439df93b055b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b664592e9ba8c47c9e23408db7ba52eb9f946c8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b84fd400f80adf4d1c88fbce50ae1cf2f8119e65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cab5a342f0589334046741006d8a280514f94235\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc4a1a2ce0c58eafd477effb055863935260ddc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e25d47a526939ad44b75f778b8a7500562b84fc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:54:07+00:00",
      "cve": "CVE-2026-74675",
      "id": "CVE-2026-74675",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vt: stabilize tty reference in kbd_keycode with tty_port_tty_get",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74675.json",
      "version": "3"
    }
  }
}



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