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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < 759ead98a39fb625be302f9aa66290985dcaa325 (git)
Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < e57f0aa5c35be37218ba0e4887b241584dd4b2d2 (git)
Affected: 2c1fd53af21b8cb13878b054894d33d3383eb1f3 , < 36672c8d7d14e9c43287528455d2c97b526ea6ad (git)
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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"
          ],
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      "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": [
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            "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"
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          "url": "https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325"
        },
        {
          "url": "https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad"
        }
      ],
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  "cveMetadata": {
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    "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"
  },
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  "dataVersion": "5.2",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:53:13+00:00",
      "cve": "CVE-2026-74652",
      "id": "CVE-2026-74652",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74652.json",
      "version": "3"
    }
  }
}



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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

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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.