CVE-2026-99181 (GCVE-0-2026-99181)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-30 12:42
VLAI
Title
autofs: ignore notification errors from a replaced pipe
Summary
In the Linux kernel, the following vulnerability has been resolved: autofs: ignore notification errors from a replaced pipe autofs_notify_daemon() takes a reference to the current notification pipe under wq_mutex, then drops the mutex before writing the request. The write can block while the daemon enters catatonic mode and installs a replacement pipe. If the old pipe's reader is then closed, the delayed write returns -EPIPE and the generic error path enters catatonic mode again. That transition acts on the current superblock state, closes the replacement pipe, and releases the new daemon generation's wait queues. Only enter catatonic mode when the pipe which failed is still the current pipe. Factor the already-locked transition so the identity check and state change are atomic with respect to another replacement. This was reproduced on v7.3-rc5-337-gff47652a4b66c in a local QEMU guest. An unprivileged UID 65534 lookup filled the old packet pipe before a normal CATATONIC/SETPIPEFD restart. On the unmodified kernel, the new pipe received HUP and both a pending victim lookup and a later lookup failed with ENOENT in two out of two fresh-mount runs. With this change, the new pipe remained active, received an intact 304-byte request, and both victim lookups completed in two out of two runs. Normal lookup and restart-without-a-blocked-writer controls passed. No KASAN, oops, refcount, or lock diagnostic was observed. A source reproducer and complete local logs are available privately on request. The demonstrated impact is limited to denial of a shared autofs service during a legitimate daemon restart. No memory corruption, information leak, privilege escalation, or code execution primitive was observed.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6650 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 95ba5de229c1875e836f10646c4e6c454d560060 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < d3477ebdce74dc3bae404048258e70d7046c208a (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 6d2b8ad36e09e07993addd4ce92b578d3b13c8f8 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 35c2c4f3cf1403b058237c44000199a6c9a59273 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 8c8386ffc582155451f074f25759f665e626a850 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 1a177064f501ed4b67873a43aae5d5bdb18b3704 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < fb296391f685d82dbb93621a970fb234cea45280 (git)
Affected: 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e , < 65676cd4203c0e41a94caf54080a7f0a95434bda (git)
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Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nautofs: ignore notification errors from a replaced pipe\n\nautofs_notify_daemon() takes a reference to the current notification\npipe under wq_mutex, then drops the mutex before writing the request. The\nwrite can block while the daemon enters catatonic mode and installs a\nreplacement pipe.\n\nIf the old pipe\u0027s reader is then closed, the delayed write returns -EPIPE\nand the generic error path enters catatonic mode again. That transition\nacts on the current superblock state, closes the replacement pipe, and\nreleases the new daemon generation\u0027s wait queues.\n\nOnly enter catatonic mode when the pipe which failed is still the current\npipe. Factor the already-locked transition so the identity check and state\nchange are atomic with respect to another replacement.\n\nThis was reproduced on v7.3-rc5-337-gff47652a4b66c in a local QEMU guest.\nAn unprivileged UID 65534 lookup filled the old packet pipe before a\nnormal CATATONIC/SETPIPEFD restart. On the unmodified kernel, the new pipe\nreceived HUP and both a pending victim lookup and a later lookup failed\nwith ENOENT in two out of two fresh-mount runs.\n\nWith this change, the new pipe remained active, received an intact\n304-byte request, and both victim lookups completed in two out of two\nruns. Normal lookup and restart-without-a-blocked-writer controls passed.\nNo KASAN, oops, refcount, or lock diagnostic was observed. A source\nreproducer and complete local logs are available privately on request.\n\nThe demonstrated impact is limited to denial of a shared autofs service\nduring a legitimate daemon restart. No memory corruption, information leak,\nprivilege escalation, or code execution primitive was observed."
        }
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        {
          "url": "https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda"
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      "title": "autofs: ignore notification errors from a replaced pipe",
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    "dateReserved": "2026-09-25T10:25:14.399Z",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nautofs: ignore notification errors from a replaced pipe\n\nautofs_notify_daemon() takes a reference to the current notification\npipe under wq_mutex, then drops the mutex before writing the request. The\nwrite can block while the daemon enters catatonic mode and installs a\nreplacement pipe.\n\nIf the old pipe\u0027s reader is then closed, the delayed write returns -EPIPE\nand the generic error path enters catatonic mode again. That transition\nacts on the current superblock state, closes the replacement pipe, and\nreleases the new daemon generation\u0027s wait queues.\n\nOnly enter catatonic mode when the pipe which failed is still the current\npipe. Factor the already-locked transition so the identity check and state\nchange are atomic with respect to another replacement.\n\nThis was reproduced on v7.3-rc5-337-gff47652a4b66c in a local QEMU guest.\nAn unprivileged UID 65534 lookup filled the old packet pipe before a\nnormal CATATONIC/SETPIPEFD restart. On the unmodified kernel, the new pipe\nreceived HUP and both a pending victim lookup and a later lookup failed\nwith ENOENT in two out of two fresh-mount runs.\n\nWith this change, the new pipe remained active, received an intact\n304-byte request, and both victim lookups completed in two out of two\nruns. Normal lookup and restart-without-a-blocked-writer controls passed.\nNo KASAN, oops, refcount, or lock diagnostic was observed. A source\nreproducer and complete local logs are available privately on request.\n\nThe demonstrated impact is limited to denial of a shared autofs service\nduring a legitimate daemon restart. No memory corruption, information leak,\nprivilege escalation, or code execution primitive was observed."
          }
        ],
        "id": "CVE-2026-99181",
        "lastModified": "2026-10-30T13:21:51.783",
        "metrics": {},
        "published": "2026-10-28T11:17:38.883",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-11-03T03:39:26+00:00",
      "cve": "CVE-2026-99181",
      "id": "CVE-2026-99181",
      "initial_release_date": "2026-10-28T10:35:34.443000+00:00",
      "product_status:known_affected": "251",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via improper notification pipe error handling in autofs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99181.json",
      "version": "3"
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      "current_release_date": "2026-11-03T17:34:17Z",
      "cve": "CVE-2026-99181",
      "id": "CVE-2026-99181",
      "initial_release_date": "2026-10-28T17:32:20Z",
      "product_status:known_affected": "214",
      "product_status:known_not_affected": "134",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99181",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99181.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.