{"id":"CVE-2026-98754","title":"tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: vcc: hold port lock when clearing tty pointer in vcc_cleanup\n\nvcc_cleanup() sets port->tty to NULL without holding port->lock, racing\nwith vcc_event() LDC callback…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 57753441ef84bee3bf0e9ee1e3778d119c44aa32","Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 88f6ecb058801e9ce7b9aabc966530118d7cd53c","Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 821050631750e982007c0856c119346edba51cae","Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4","Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 03b49c991abb8d021ca6fe51cd173447236b0552","Linux 4.14"],"published":"2026-10-18","updated":"2026-10-26","sourceUpdated":"2026-10-26T06:55:48.861Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98754","references":[{"url":"https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32"},{"url":"https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c"},{"url":"https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae"},{"url":"https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4"},{"url":"https://git.kernel.org/stable/c/03b49c991abb8d021ca6fe51cd173447236b0552"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98754.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98754"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555120"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98754"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98754"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98754.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00168,"epssPercentile":0.05988,"ingestedAt":"2026-10-18T16:47:32.499Z","slug":"CVE-2026-98754","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntty: vcc: hold port lock when clearing tty pointer in vcc_cleanup\n\nvcc_cleanup() sets port->tty to NULL without holding port->lock, racing\nwith vcc_event() LDC callbacks that read port->tty under port->lock and\nthen use tty->port. This can cause a use-after-free when the callback\ndereferences tty->port after cleanup has already destroyed and freed it.\n\n## Affected\n\n- `Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 57753441ef84bee3bf0e9ee1e3778d119c44aa32`\n- `Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 88f6ecb058801e9ce7b9aabc966530118d7cd53c`\n- `Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 821050631750e982007c0856c119346edba51cae`\n- `Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4`\n- `Linux >= 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb < 03b49c991abb8d021ca6fe51cd173447236b0552`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98754.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228188,"id":"CVE-2026-98754","ts":1792758175383,"field":"cvss","old":null,"new":"7"},{"seq":228187,"id":"CVE-2026-98754","ts":1792758175383,"field":"severity","old":"none","new":"high"}]}