CVE-2023-54220 (GCVE-0-2023-54220)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-10-15 21:41
VLAI
Title
serial: 8250: Fix oops for port->pm on uart_change_pm()
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:39 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 490bf37eaabb0a857ed1ae8e75d8854e41662f1c , < 66f3e55960698c874b0598277913b478ecd29573 (git)
Affected: c9e080c3005fd183c56ff8f4d75edb5da0765d2c , < 720a297b334e85d34099e83d1f375b92c3efedd6 (git)
Affected: d5cd2928d31042a7c0a01464f9a8d95be736421d , < b653289ca6460a6552c8590b75dfa84a0140a46b (git)
Affected: 2c86a1305c1406f45ea780d06953c484ea1d9e6e , < bd70d0b28010d560a8be96b44fea86fe2ba016ae (git)
Affected: 1ba5594739d858e524ff0f398ee1ebfe0a8b9d41 , < 18e27df4f2b4e257c317ba8076f31a888f6cc64b (git)
Affected: af4d6dbb1a92ea424ad1ba1d0c88c7fa2345d872 , < 0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c (git)
Affected: 04e82793f068d2f0ffe62fcea03d007a8cdc16a7 , < 375806616f8c772c33d40e112530887b37c1a816 (git)
Affected: 04e82793f068d2f0ffe62fcea03d007a8cdc16a7 , < dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534 (git)
Affected: 8e596aed5f2f98cf3e6e98d6fe1d689f4a319308 (git)
Affected: 4.14.316 , < 4.14.324 (semver)
Affected: 4.19.284 , < 4.19.293 (semver)
Affected: 5.4.244 , < 5.4.255 (semver)
Affected: 5.10.181 , < 5.10.192 (semver)
Affected: 5.15.113 , < 5.15.128 (semver)
Affected: 6.1.30 , < 6.1.47 (semver)
Affected: 6.3.4 , < 6.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 4.14.324 , ≤ 4.14.* (semver)
Unaffected: 4.19.293 , ≤ 4.19.* (semver)
Unaffected: 5.4.255 , ≤ 5.4.* (semver)
Unaffected: 5.10.192 , ≤ 5.10.* (semver)
Unaffected: 5.15.128 , ≤ 5.15.* (semver)
Unaffected: 6.1.47 , ≤ 6.1.* (semver)
Unaffected: 6.4.12 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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()."
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              "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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      "title": "serial: 8250: Fix oops for port-\u003epm on uart_change_pm()",
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        "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()."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nserial: 8250: Correcci\u00f3n de oops para port  -\u003e  pm en uart_change_pm()\n\nLa descarga de un controlador 8250 espec\u00edfico de hardware puede producir el error \u2019Unable to handle kernel paging request at virtual address\u2019 aproximadamente diez segundos despu\u00e9s de descargar el controlador. Esto ocurre cuando uart_hangup() llama a uart_change_pm().\n\nResulta que el commit 04e82793f068 (\u2019serial: 8250: Reiniciar port  -\u003e  pm al desvincular el controlador espec\u00edfico del puerto\u2019) fue solo una soluci\u00f3n parcial. Si el controlador espec\u00edfico de hardware ha inicializado la funci\u00f3n port  -\u003e  pm, tambi\u00e9n necesitamos limpiar port  -\u003e  pm. Solo reinicializar port  -\u003e  ops no hace esto. De lo contrario, serial8250_pm() llamar\u00e1 a port  -\u003e  pm() en lugar de serial8250_do_pm()."
          }
        ],
        "id": "CVE-2023-54220",
        "lastModified": "2026-10-28T19:10:00.193",
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                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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      "current_release_date": "2026-10-16T18:21:35+00:00",
      "cve": "CVE-2023-54220",
      "id": "CVE-2023-54220",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "167",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: 8250: Fix oops for port-\u003epm on uart_change_pm()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54220.json",
      "version": "3"
    },
    "vulnrichment": {
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                    "version": "2.0.3"
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "programFiles": [
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                  "version": "6.4.12",
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                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.5",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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              "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()."
            }
          ],
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                "baseScore": 7.8,
                "baseSeverity": "HIGH",
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              },
              "scenarios": [
                {
                  "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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              "url": "https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534"
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          "title": "serial: 8250: Fix oops for port-\u003epm on uart_change_pm()",
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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"
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  }
}



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