CVE-2023-54220 (GCVE-0-2023-54220)
Vulnerability from cvelistv5
Published
2025-12-30 12:11
Modified
2026-10-15 21:41
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix oops for port->pm on uart_change_pm() Unloading a hardware specific 8250 driver can produce error "Unable to handle kernel paging request at virtual address" about ten seconds after unloading the driver. This happens on uart_hangup() calling uart_change_pm(). Turns out commit 04e82793f068 ("serial: 8250: Reinit port->pm on port specific driver unbind") was only a partial fix. If the hardware specific driver has initialized port->pm function, we need to clear port->pm too. Just reinitializing port->ops does not do this. Otherwise serial8250_pm() will call port->pm() instead of serial8250_do_pm().
References
Impacted products
Vendor Product Version
Linux Linux Version: 490bf37eaabb0a857ed1ae8e75d8854e41662f1c
Version: c9e080c3005fd183c56ff8f4d75edb5da0765d2c
Version: d5cd2928d31042a7c0a01464f9a8d95be736421d
Version: 2c86a1305c1406f45ea780d06953c484ea1d9e6e
Version: 1ba5594739d858e524ff0f398ee1ebfe0a8b9d41
Version: af4d6dbb1a92ea424ad1ba1d0c88c7fa2345d872
Version: 04e82793f068d2f0ffe62fcea03d007a8cdc16a7
Version: 04e82793f068d2f0ffe62fcea03d007a8cdc16a7
Version: 8e596aed5f2f98cf3e6e98d6fe1d689f4a319308
Version: 4.14.316   ≤
Version: 4.19.284   ≤
Version: 5.4.244   ≤
Version: 5.10.181   ≤
Version: 5.15.113   ≤
Version: 6.1.30   ≤
Version: 6.3.4   ≤
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix oops for port-\u003epm 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-\u003epm on port\nspecific driver unbind\") was only a partial fix. If the hardware specific\ndriver has initialized port-\u003epm function, we need to clear port-\u003epm too.\nJust reinitializing port-\u003eops does not do this. Otherwise serial8250_pm()\nwill call port-\u003epm() instead of serial8250_do_pm()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The stale `port-\u003epm` 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 \u2014 once the hardware-specific 8250 driver is unbound or unloaded, `port-\u003epm` 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 \u2014 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()` \u2192 `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\u0027s 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 \u2014 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 \u2014 \"Unable to handle kernel paging request at virtual address\" / \"Internal error: imprecise external abort\" \u2014 a kernel oops that kills the affected task and can panic the system."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/66f3e55960698c874b0598277913b478ecd29573"
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        {
          "url": "https://git.kernel.org/stable/c/720a297b334e85d34099e83d1f375b92c3efedd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/b653289ca6460a6552c8590b75dfa84a0140a46b"
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        {
          "url": "https://git.kernel.org/stable/c/bd70d0b28010d560a8be96b44fea86fe2ba016ae"
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          "url": "https://git.kernel.org/stable/c/18e27df4f2b4e257c317ba8076f31a888f6cc64b"
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          "url": "https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534"
        }
      ],
      "title": "serial: 8250: Fix oops for port-\u003epm on uart_change_pm()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54220",
    "datePublished": "2025-12-30T12:11:15.385Z",
    "dateReserved": "2025-12-30T12:06:44.501Z",
    "dateUpdated": "2026-10-15T21:41:42.172Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
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module unload; there is no network- or physically-mediated path to the code.\\nAC:L - There is no race and no memory-layout dependency \\u2014 once the hardware-specific 8250 driver is unbound or unloaded, `port-\u003epm` 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 \\u2014 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()` \\u2192 `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 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\"affected\", \"version\": \"5.15.113\", \"lessThan\": \"5.15.128\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.30\", \"lessThan\": \"6.1.47\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.3.4\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/tty/serial/8250/8250_port.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.324\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.293\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.255\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.192\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.47\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/serial/8250/8250_port.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nserial: 8250: Fix oops for port-\u003epm 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-\u003epm on port\\nspecific driver unbind\\\") was only a partial fix. If the hardware specific\\ndriver has initialized port-\u003epm function, we need to clear port-\u003epm too.\\nJust reinitializing port-\u003eops does not do this. Otherwise serial8250_pm()\\nwill call port-\u003epm() instead of serial8250_do_pm().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.324\", \"versionStartIncluding\": \"4.14.316\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.293\", \"versionStartIncluding\": \"4.19.284\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.255\", \"versionStartIncluding\": \"5.4.244\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.192\", \"versionStartIncluding\": \"5.10.181\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.128\", \"versionStartIncluding\": \"5.15.113\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.47\", \"versionStartIncluding\": \"6.1.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.12\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.3.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:18:10.284Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-54220\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:41:42.172Z\", \"dateReserved\": \"2025-12-30T12:06:44.501Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-30T12:11:15.385Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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