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GHSA-9CCW-6G9X-96R5

Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2025-11-04 18:31
VLAI
Details

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

watch_queue: fix pipe accounting mismatch

Currently, watch_queue_set_size() modifies the pipe buffers charged to user->pipe_bufs without updating the pipe->nr_accounted on the pipe itself, due to the if (!pipe_has_watch_queue()) test in pipe_resize_ring(). This means that when the pipe is ultimately freed, we decrement user->pipe_bufs by something other than what than we had charged to it, potentially leading to an underflow. This in turn can cause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM.

To remedy this, explicitly account for the pipe usage in watch_queue_set_size() to match the number set via account_pipe_buffers()

(It's unclear why watch_queue_set_size() does not update nr_accounted; it may be due to intentional overprovisioning in watch_queue_set_size()?)

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-23138"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:16:08Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: fix pipe accounting mismatch\n\nCurrently, watch_queue_set_size() modifies the pipe buffers charged to\nuser-\u003epipe_bufs without updating the pipe-\u003enr_accounted on the pipe\nitself, due to the if (!pipe_has_watch_queue()) test in\npipe_resize_ring(). This means that when the pipe is ultimately freed,\nwe decrement user-\u003epipe_bufs by something other than what than we had\ncharged to it, potentially leading to an underflow. This in turn can\ncause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM.\n\nTo remedy this, explicitly account for the pipe usage in\nwatch_queue_set_size() to match the number set via account_pipe_buffers()\n\n(It\u0027s unclear why watch_queue_set_size() does not update nr_accounted;\nit may be due to intentional overprovisioning in watch_queue_set_size()?)",
  "id": "GHSA-9ccw-6g9x-96r5",
  "modified": "2025-11-04T18:31:31Z",
  "published": "2025-04-16T15:34:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/205028ebba838938d3b264dda1d0708fa7fe1ade"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d680b988656bb556c863d8b46d9b9096842bf3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/471c89b7d4f58bd6082f7c1fe14d4ca15c7f1284"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ec918e6c86c1536870e4373e91eddd0c44245f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dafa27764183738dc5368b669b71e3d0d154f12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8658c75343ed00e5e154ebbe24335f51ba8db547"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d40e3537265dea9e3c33021874437ff26dc18787"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f13abc1e8e1a3b7455511c4e122750127f6bc9b0"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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