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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-99181: autofs: ignore notification errors from a replaced pipe

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 1a177064f501ed4b67873a43aae5d5bdb18b3704, 35c2c4f3cf1403b058237c44000199a6c9a59273, 65676cd4203c0e41a94caf54080a7f0a95434bda; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1a177064f501ed4b67873a43aae5d5bdb18b3704, 35c2c4f3cf1403b058237c44000199a6c9a59273, 65676cd4203c0e41a94caf54080a7f0a95434bda; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 28, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.28affected
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 95ba5de229c1875e836f10646c4e6c454d560060affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before d3477ebdce74dc3bae404048258e70d7046c208aaffected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 6d2b8ad36e09e07993addd4ce92b578d3b13c8f8affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 35c2c4f3cf1403b058237c44000199a6c9a59273affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 8c8386ffc582155451f074f25759f665e626a850affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 1a177064f501ed4b67873a43aae5d5bdb18b3704affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before fb296391f685d82dbb93621a970fb234cea45280affected · git
    • 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e and later · before 65676cd4203c0e41a94caf54080a7f0a95434bdaaffected · git
    • before 2.6.28not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-26.12.115-2

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99179Oct 28, 2026 · watch_queue: Fix note pool publication race in watch_queue_set_size()
    0Monitor
  • ← EarlierCVE-2026-99180Oct 28, 2026 · unicode: free the map after a grace period
    31Monitor
  • Later →CVE-2026-99182Oct 28, 2026 · ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1a177064f501ed4b67873a43aae5d5bdb18b3704Vendor (CNA)
Linux Linux35c2c4f3cf1403b058237c44000199a6c9a59273Vendor (CNA)
Linux Linux65676cd4203c0e41a94caf54080a7f0a95434bdaVendor (CNA)
Linux Linux6d2b8ad36e09e07993addd4ce92b578d3b13c8f8Vendor (CNA)
Linux Linux8c8386ffc582155451f074f25759f665e626a850Vendor (CNA)
Linux Linux95ba5de229c1875e836f10646c4e6c454d560060Vendor (CNA)
Linux Linuxd3477ebdce74dc3bae404048258e70d7046c208aVendor (CNA)
Linux Linuxfb296391f685d82dbb93621a970fb234cea45280Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+8 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records