{"id":"CVE-2023-54220","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix oops for port->pm on uart_change_pm()\n\nUnloading a hardware specific 8250 driver can produce error \"Unable to\nhandle kernel paging request at virtual …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix oops for port->pm on uart_change_pm()\n\nUnloading a hardware specific 8250 driver can produce error \"Unable to\nhandle kernel paging request at virtual …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-772"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 9"],"published":"2025-12-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:55.603","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-54220","references":[{"url":"https://git.kernel.org/stable/c/0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/18e27df4f2b4e257c317ba8076f31a888f6cc64b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/375806616f8c772c33d40e112530887b37c1a816","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/66f3e55960698c874b0598277913b478ecd29573","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/720a297b334e85d34099e83d1f375b92c3efedd6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b653289ca6460a6552c8590b75dfa84a0140a46b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bd70d0b28010d560a8be96b44fea86fe2ba016ae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54220.json"},{"url":"https://access.redhat.com/security/cve/CVE-2023-54220"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2426078"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-54220"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54220"},{"url":"https://lore.kernel.org/linux-cve-announce/2025123027-CVE-2023-54220-2951@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00155,"epssPercentile":0.04547,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:39:29.518449Z"},"scores":{"nvd":7.8,"vendor":3.3,"cna":7.8},"ingestedAt":"2026-10-15T22:48:25.434Z","slug":"CVE-2023-54220","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix oops for port->pm on uart_change_pm()\n\nUnloading a hardware specific 8250 driver can produce error \"Unable to\nhandle kernel paging request at virtual address\" about ten seconds after\nunloading the driver. This happens on uart_hangup() calling\nuart_change_pm().\n\nTurns out commit 04e82793f068 (\"serial: 8250: Reinit port->pm on port\nspecific driver unbind\") was only a partial fix. If the hardware specific\ndriver has initialized port->pm function, we need to clear port->pm too.\nJust reinitializing port->ops does not do this. Otherwise serial8250_pm()\nwill call port->pm() instead of serial8250_do_pm().\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** · Low · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54220.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":230103,"id":"CVE-2023-54220","ts":1793124790087,"field":"cvss","old":"3.3","new":"7.8"},{"seq":230102,"id":"CVE-2023-54220","ts":1793124790087,"field":"severity","old":"low","new":"high"},{"seq":223785,"id":"CVE-2023-54220","ts":1792238425646,"field":"cvss","old":"7.8","new":"3.3"},{"seq":223784,"id":"CVE-2023-54220","ts":1792238425646,"field":"severity","old":"high","new":"low"}]}