CVE-2026-99181autofs: ignore notification errors from a replaced pipe
- —Not scoredno CVSS score yet
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 95ba5de229c1875e836f10646c4e6c454d560060
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < d3477ebdce74dc3bae404048258e70d7046c208a
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 6d2b8ad36e09e07993addd4ce92b578d3b13c8f8
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 35c2c4f3cf1403b058237c44000199a6c9a59273
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 8c8386ffc582155451f074f25759f665e626a850
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 1a177064f501ed4b67873a43aae5d5bdb18b3704
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < fb296391f685d82dbb93621a970fb234cea45280
- affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e – < 65676cd4203c0e41a94caf54080a7f0a95434bda
- affected 2.6.28
- unaffected < 2.6.28
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060 (opens in a new tab)
- https://git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a (opens in a new tab)
- https://git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8 (opens in a new tab)
- https://git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273 (opens in a new tab)
- https://git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850 (opens in a new tab)
- https://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704 (opens in a new tab)
- https://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280 (opens in a new tab)
- https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-111933 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-99181)Record last updated .