{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54220", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.501Z", "datePublished": "2025-12-30T12:11:15.385Z", "dateUpdated": "2026-08-05T09:18:10.284Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:18:10.284Z" }, "descriptions": [ { "lang": "en", "value": "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 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()." } ], "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 stale `port->pm` call is reached through local tty operations (open/close/hangup on /dev/ttyS*) and the state is created via local sysfs unbind or module unload; there is no network- or physically-mediated path to the code.\nAC:L - There is no race and no memory-layout dependency — once the hardware-specific 8250 driver is unbound or unloaded, `port->pm` is unconditionally stale and every subsequent `uart_change_pm()` transition dereferences it deterministically (the reporter saw it reliably ~10s later on the automatic hangup).\nPR:L - The dangling call is executed by unprivileged tty operations — an ordinary user with serial-device access (commonly granted via the dialout group on the embedded/industrial systems running 8250_omap/mtk/pxa/exar) opening or closing the port, or simply exiting a process holding it as controlling tty, is enough.\nUI:N - No victim action is needed; the kernel itself invokes `uart_hangup()` → `uart_change_pm()` on process exit and `uart_shutdown()` on close, so the stale pointer fires automatically.\nS:U - The stale function-pointer call and the resulting corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a dangling function pointer into freed module text plus MMIO access through a released ioremap mapping — the same class as a use-after-free, which allows an attacker who reclaims the freed region to obtain arbitrary kernel-memory read.\nI:H - An indirect call through a freed code pointer is a direct control-flow hijack primitive, and `omap_8250_pm()`/`exar_pm()` additionally perform `serial_out()` writes through a dangling ioremap cookie, giving an uncontrolled kernel write.\nA:H - The commit documents the concrete result — \"Unable to handle kernel paging request at virtual address\" / \"Internal error: imprecise external abort\" — a kernel oops that kills the affected task and can panic the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/serial/8250/8250_port.c" ], "versions": [ { "version": "490bf37eaabb0a857ed1ae8e75d8854e41662f1c", "lessThan": "66f3e55960698c874b0598277913b478ecd29573", "status": "affected", "versionType": "git" }, { "version": "c9e080c3005fd183c56ff8f4d75edb5da0765d2c", "lessThan": "720a297b334e85d34099e83d1f375b92c3efedd6", "status": "affected", "versionType": "git" }, { "version": "d5cd2928d31042a7c0a01464f9a8d95be736421d", "lessThan": "b653289ca6460a6552c8590b75dfa84a0140a46b", "status": "affected", "versionType": "git" }, { "version": "2c86a1305c1406f45ea780d06953c484ea1d9e6e", "lessThan": "bd70d0b28010d560a8be96b44fea86fe2ba016ae", "status": "affected", "versionType": "git" }, { "version": "1ba5594739d858e524ff0f398ee1ebfe0a8b9d41", "lessThan": "18e27df4f2b4e257c317ba8076f31a888f6cc64b", "status": "affected", "versionType": "git" }, { "version": "af4d6dbb1a92ea424ad1ba1d0c88c7fa2345d872", "lessThan": "0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c", "status": "affected", "versionType": "git" }, { "version": "04e82793f068d2f0ffe62fcea03d007a8cdc16a7", "lessThan": "375806616f8c772c33d40e112530887b37c1a816", "status": "affected", "versionType": "git" }, { "version": "04e82793f068d2f0ffe62fcea03d007a8cdc16a7", "lessThan": "dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534", "status": "affected", "versionType": "git" }, { "version": "8e596aed5f2f98cf3e6e98d6fe1d689f4a319308", "status": "affected", "versionType": "git" }, { "version": "4.14.316", "lessThan": "4.14.324", "status": "affected", "versionType": "semver" }, { "version": "4.19.284", "lessThan": "4.19.293", "status": "affected", "versionType": "semver" }, { "version": "5.4.244", "lessThan": "5.4.255", "status": "affected", "versionType": "semver" }, { "version": "5.10.181", "lessThan": "5.10.192", "status": "affected", "versionType": "semver" }, { "version": "5.15.113", "lessThan": "5.15.128", "status": "affected", "versionType": "semver" }, { "version": "6.1.30", "lessThan": "6.1.47", "status": "affected", "versionType": "semver" }, { "version": "6.3.4", "lessThan": "6.4", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/serial/8250/8250_port.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.324", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.293", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.255", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.192", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.128", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.47", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.12", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "4.14.316", "versionEndExcluding": "4.14.324" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.284", "versionEndExcluding": "4.19.293" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.244", "versionEndExcluding": "5.4.255" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.181", "versionEndExcluding": "5.10.192" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.113", "versionEndExcluding": "5.15.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.30", "versionEndExcluding": "6.1.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.4.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/66f3e55960698c874b0598277913b478ecd29573" }, { "url": "https://git.kernel.org/stable/c/720a297b334e85d34099e83d1f375b92c3efedd6" }, { "url": "https://git.kernel.org/stable/c/b653289ca6460a6552c8590b75dfa84a0140a46b" }, { "url": "https://git.kernel.org/stable/c/bd70d0b28010d560a8be96b44fea86fe2ba016ae" }, { "url": "https://git.kernel.org/stable/c/18e27df4f2b4e257c317ba8076f31a888f6cc64b" }, { "url": "https://git.kernel.org/stable/c/0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c" }, { "url": "https://git.kernel.org/stable/c/375806616f8c772c33d40e112530887b37c1a816" }, { "url": "https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534" } ], "title": "serial: 8250: Fix oops for port->pm on uart_change_pm()", "x_generator": { "engine": "bippy-1.2.0" } } } }