Vulnerability-Lookup

GHSA-9X5X-PXV9-G7VG

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ

The RS485 trigger hrtimers are embedded in the devm-managed port and can fire after it is freed. The IRQ handler can arm a timer, so free the IRQ first and then cancel both timers.

Complete the RS485 stop without arming a timer, and cancel the timers in remove() for the suspend-then-unbind path, where shutdown is not called.

This issue was found by an in-house static analysis tool.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74652"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:38Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: amba-pl011: cancel RS485 hrtimers after freeing IRQ\n\nThe RS485 trigger hrtimers are embedded in the devm-managed port and can\nfire after it is freed. The IRQ handler can arm a timer, so free the IRQ\nfirst and then cancel both timers.\n\nComplete the RS485 stop without arming a timer, and cancel the timers\nin remove() for the suspend-then-unbind path, where shutdown is not\ncalled.\n\nThis issue was found by an in-house static analysis tool.",
  "id": "GHSA-9x5x-pxv9-g7vg",
  "modified": "2026-08-25T06:31:25Z",
  "published": "2026-08-22T18:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74652"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74652 (GCVE-0-2026-74652)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41

Title

serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ

Summary

In the Linux kernel, the following vulnerability has been resolved: serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ The RS485 trigger hrtimers are embedded in the devm-managed port and can fire after it is freed. The IRQ handler can arm a timer, so free the IRQ first and then cancel both timers. Complete the RS485 stop without arming a timer, and cancel the timers in remove() for the suspend-then-unbind path, where shutdown is not called. This issue was found by an in-house static analysis tool.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/759ead98a39fb625b…
https://git.kernel.org/stable/c/e57f0aa5c35be3721…
https://git.kernel.org/stable/c/36672c8d7d14e9c43…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < 759ead98a39fb625be302f9aa66290985dcaa325 (git) Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < e57f0aa5c35be37218ba0e4887b241584dd4b2d2 (git) Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < 36672c8d7d14e9c43287528455d2c97b526ea6ad (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/amba-pl011.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "759ead98a39fb625be302f9aa66290985dcaa325",
              "status": "affected",
              "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3",
              "versionType": "git"
            },
            {
              "lessThan": "e57f0aa5c35be37218ba0e4887b241584dd4b2d2",
              "status": "affected",
              "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3",
              "versionType": "git"
            },
            {
              "lessThan": "36672c8d7d14e9c43287528455d2c97b526ea6ad",
              "status": "affected",
              "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/amba-pl011.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: amba-pl011: cancel RS485 hrtimers after freeing IRQ\n\nThe RS485 trigger hrtimers are embedded in the devm-managed port and can\nfire after it is freed. The IRQ handler can arm a timer, so free the IRQ\nfirst and then cancel both timers.\n\nComplete the RS485 stop without arming a timer, and cancel the timers\nin remove() for the suspend-then-unbind path, where shutdown is not\ncalled.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
      "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": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the PL011 UART/RS485 driver and is reached only via local tty access (open/ioctl TIOCSRS485, write, close) on /dev/ttyAMA* or similar nodes; it is not reachable from the network or from RS485 bus traffic alone without local device control.\nAC:L - An attacker with tty access can enable RS485, queue TX with RTS delay timers, and close or race teardown to arm hrtimers during shutdown/remove; they control both the TX state machine and teardown timing, making the race reliably triggerable.\nPR:L - Exploitation requires write access to the UART tty device (typically dialout group membership), not root; ioctl/write/close drive the RS485 timers and buggy shutdown path, while the suspend-then-unbind heap UAF needs admin but is not the minimum privilege bar.\nUI:N - No victim interaction is required; the attacker who holds the tty fd performs TIOCSRS485, transmission, and port close or coordinates teardown themselves without needing another user to act.\nS:U - Impact is confined to kernel memory and hardware on the same host (crash, corruption, potential privilege escalation); it does not cross VM, container, or IOMMU security boundaries.\nC:H - RS485 hrtimers embedded in the devm uart_amba_port can fire after the port is freed during remove or buggy shutdown, causing a use-after-free that exposes freed kernel heap contents and enables arbitrary memory read primitives.\nI:H - UAF timer callbacks (pl011_trigger_start_tx/pl011_trigger_stop_tx) continue operating on freed uart_amba_port memory, performing MMIO reads/writes and state updates that enable heap grooming and kernel data corruption or control-flow hijacking.\nA:H - Use-after-free and concurrent hrtimer callbacks during/after port teardown can cause kernel oops, panic, or hang; RS485 timers may also fire on a partially shut down UART, destabilizing the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:10.525Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325"
        },
        {
          "url": "https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad"
        }
      ],
      "title": "serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74652",
    "datePublished": "2026-08-22T15:32:27.799Z",
    "dateReserved": "2026-08-15T05:44:03.923Z",
    "dateUpdated": "2026-08-25T05:41:10.525Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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