350 lines
18 KiB
JSON
350 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-54220",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-12-30T12:06:44.501Z",
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"datePublished": "2025-12-30T12:11:15.385Z",
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"dateUpdated": "2026-10-15T21:41:42.172Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:18:10.284Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/tty/serial/8250/8250_port.c"
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],
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},
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{
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"version": "4.14.316",
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"lessThan": "4.14.324",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.19.284",
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"lessThan": "4.19.293",
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"status": "affected",
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},
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{
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"version": "5.4.244",
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"lessThan": "5.4.255",
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"status": "affected",
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},
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{
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"version": "5.10.181",
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"status": "affected",
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},
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{
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"version": "5.15.113",
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"lessThan": "5.15.128",
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"status": "affected",
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},
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{
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"version": "6.1.30",
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"status": "affected",
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},
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}
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{
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"product": "Linux",
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"drivers/tty/serial/8250/8250_port.c"
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],
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"version": "0",
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{
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"version": "4.14.324",
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},
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{
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"version": "4.19.293",
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},
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"version": "5.10.192",
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},
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{
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},
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"version": "6.5",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/66f3e55960698c874b0598277913b478ecd29573"
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"url": "https://git.kernel.org/stable/c/0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c"
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"url": "https://git.kernel.org/stable/c/375806616f8c772c33d40e112530887b37c1a816"
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{
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"url": "https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534"
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}
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],
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"title": "serial: 8250: Fix oops for port->pm on uart_change_pm()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-54220",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:39:29.518449Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-10-15T21:41:42.172Z"
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}
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}
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]
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}
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} |