{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74675", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.925Z", "datePublished": "2026-08-22T15:32:44.493Z", "dateUpdated": "2026-10-16T19:16:08.728Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:27.811Z" }, "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->port.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": { "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" }, "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—opening/closing the VT tty and generating key or key-repeat input—so 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->ops 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->driver_data on a freed tty_struct and may indirect-call through tty->ops 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/keyboard.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b84fd400f80adf4d1c88fbce50ae1cf2f8119e65", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "38400673c9bfb39cfc87539e1a072087e98f4e4f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cab5a342f0589334046741006d8a280514f94235", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "38a0aa593ebc275aea6f79534d07f44e43768ce6", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3f6b1d3fcfc26dc3fc85262f753439df93b055b4", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b664592e9ba8c47c9e23408db7ba52eb9f946c8a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc4a1a2ce0c58eafd477effb055863935260ddc1", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e25d47a526939ad44b75f778b8a7500562b84fc1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/keyboard.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74675", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:14:25.197026Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:16:08.728Z" } } ] } }