CVE-2025-39724 (GCVE-0-2025-39724)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-05-12 12:06
VLAI?
Title
serial: 8250: fix panic due to PSLVERR
Summary
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 0b882f00655afefbc7729c6b5aec86f7a5473a3d (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 68c4613e89f000e8198f9ace643082c697921c9f (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < c826943abf473a3f7260fbadfad65e44db475460 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < cb7b3633ed749db8e56f475f43c960652cbd6882 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 8e2739478c164147d0774802008528d9e03fb802 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 38c0ea484dedb58cb3a4391229933e16be0d1031 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 7f8fdd4dbffc05982b96caf586f77a014b2a9353 (git)
Affected: 6d5e79331417886196cb3a733bdb6645ba85bc42 (git)
Affected: 2401577586898b3590db80f8b97a26f81f0f6d4e (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39724\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:50.177\",\"lastModified\":\"2026-05-12T13:17:08.053\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nserial: 8250: fix panic due to PSLVERR\\n\\nWhen the PSLVERR_RESP_EN parameter is set to 1, the device generates\\nan error response if an attempt is made to read an empty RBR (Receive\\nBuffer Register) while the FIFO is enabled.\\n\\nIn serial8250_do_startup(), calling serial_port_out(port, UART_LCR,\\nUART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes\\ndw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter\\nfunction enables the FIFO via serial_out(p, UART_FCR, p-\u003efcr).\\nExecution proceeds to the serial_port_in(port, UART_RX).\\nThis satisfies the PSLVERR trigger condition.\\n\\nWhen another CPU (e.g., using printk()) is accessing the UART (UART\\nis busy), the current CPU fails the check (value \u0026 ~UART_LCR_SPAR) ==\\n(lcr \u0026 ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter\\ndw8250_force_idle().\\n\\nPut serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port-\u003elock\\nto fix this issue.\\n\\nPanic backtrace:\\n[    0.442336] Oops - unknown exception [#1]\\n[    0.442343] epc : dw8250_serial_in32+0x1e/0x4a\\n[    0.442351]  ra : serial8250_do_startup+0x2c8/0x88e\\n...\\n[    0.442416] console_on_rootfs+0x26/0x70\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.10.48\",\"versionEndExcluding\":\"3.11\",\"matchCriteriaId\":\"AEFBF6E4-EDFE-4B47-83FA-927218F54577\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.12.24\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"075FE4E0-B619-42CF-9277-44F7A260215B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-976C-463D0611F13F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.149\",\"matchCriteriaId\":\"FDBE8280-8983-4D2D-943D-2E6D0104E2D8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.103\",\"matchCriteriaId\":\"F2293654-7169-49B5-8D0D-EE51EF8B8E48\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.44\",\"matchCriteriaId\":\"12351F24-1133-4775-960C-F2B47E81298B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.4\",\"matchCriteriaId\":\"AFC28995-B8C3-4B68-8CB6-78E792B6629D\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b882f00655afefbc7729c6b5aec86f7a5473a3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/38c0ea484dedb58cb3a4391229933e16be0d1031\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/68c4613e89f000e8198f9ace643082c697921c9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7f8fdd4dbffc05982b96caf586f77a014b2a9353\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8e2739478c164147d0774802008528d9e03fb802\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b8ca8e3f75ede308b4d49a6ca5081460be01bdb5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c826943abf473a3f7260fbadfad65e44db475460\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb7b3633ed749db8e56f475f43c960652cbd6882\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.