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serial: 8250: fix panic due to PSLVERR

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: serial: 8250: fix panic due to PSLVERR When the PSLVERR_RESP_EN parameter is set to 1, the device generates an error response if an attempt is made to read an empty RBR (Receive Buffer Register) while the FIFO is enabled. In serial8250_do_startup(), calling serial_port_out(port, UART_LCR, UART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes dw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter function enables the FIFO via serial_out(p, UART_FCR, p->fcr). Execution proceeds to the serial_port_in(port, UART_RX). This satisfies the PSLVERR trigger condition. When another CPU (e.g., using printk()) is accessing the UART (UART is busy), the current CPU fails the check (value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter dw8250_force_idle(). Put serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port->lock to fix this issue. Panic backtrace: [ 0.442336] Oops - unknown exception [#1] [ 0.442343] epc : dw8250_serial_in32+0x1e/0x4a [ 0.442351] ra : serial8250_do_startup+0x2c8/0x88e ... [ 0.442416] console_on_rootfs+0x26/0x70

Announced Source revision 1
Original source ↗

CVE-2025-39724

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-39724

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "0b882f00655afefbc7729c6b5aec86f7a5473a3d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "b8ca8e3f75ede308b4d49a6ca5081460be01bdb5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "68c4613e89f000e8198f9ace643082c697921c9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "c826943abf473a3f7260fbadfad65e44db475460",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "8e2739478c164147d0774802008528d9e03fb802",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d",
        "lessThan": "38c0ea484dedb58cb3a4391229933e16be0d1031",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "7f8fdd4dbffc05982b96caf586f77a014b2a9353",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d5e79331417886196cb3a733bdb6645ba85bc42",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2401577586898b3590db80f8b97a26f81f0f6d4e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3.10.48",
        "lessThan": "3.11",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "3.12.24",
        "lessThan": "3.13",
        "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": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.297",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.241",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.149",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/tty/serial/8250/8250_port.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39724

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27059 · Revision 1
Added to Heist Feed
Publisher date
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