autofs: ignore notification errors from a replaced pipe

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99181
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:38 UTC
Updated2026-10-30 13:21:51 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001970000 probability, percentile 0.094940000 (date 2026-11-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 95ba5de229c1875e836f10646c4e6c454d560060 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e d3477ebdce74dc3bae404048258e70d7046c208a git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 6d2b8ad36e09e07993addd4ce92b578d3b13c8f8 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 35c2c4f3cf1403b058237c44000199a6c9a59273 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 8c8386ffc582155451f074f25759f665e626a850 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 1a177064f501ed4b67873a43aae5d5bdb18b3704 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e fb296391f685d82dbb93621a970fb234cea45280 git Not specified
CNA Linux Linux affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 65676cd4203c0e41a94caf54080a7f0a95434bda git Not specified
CNA Linux Linux affected 2.6.28 Not specified
CNA Linux Linux unaffected 2.6.28 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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