{"api_version":"1","generated_at":"2026-11-06T21:28:30+00:00","cve":"CVE-2026-99181","urls":{"html":"https://cve.report/CVE-2026-99181","api":"https://cve.report/api/cve/CVE-2026-99181.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99181","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99181"},"summary":{"title":"autofs: ignore notification errors from a replaced pipe","description":"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's 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's 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:38","updated_at":"2026-10-30 13:21:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060","name":"https://git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda","name":"https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704","name":"https://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850","name":"https://git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273","name":"https://git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8","name":"https://git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a","name":"https://git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280","name":"https://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99181","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99181","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 95ba5de229c1875e836f10646c4e6c454d560060 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e d3477ebdce74dc3bae404048258e70d7046c208a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 6d2b8ad36e09e07993addd4ce92b578d3b13c8f8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d7b48e0bc5fa01a818eac713d4cb0763090cd0e 35c2c4f3cf1403b058237c44000199a6c9a59273 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.224 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.191 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.161 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.115 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99181","cve":"CVE-2026-99181","epss":"0.001970000","percentile":"0.094940000","score_date":"2026-11-01","updated_at":"2026-11-02 00:05:55"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/autofs/waitq.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"95ba5de229c1875e836f10646c4e6c454d560060","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"d3477ebdce74dc3bae404048258e70d7046c208a","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"6d2b8ad36e09e07993addd4ce92b578d3b13c8f8","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"35c2c4f3cf1403b058237c44000199a6c9a59273","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"8c8386ffc582155451f074f25759f665e626a850","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"1a177064f501ed4b67873a43aae5d5bdb18b3704","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"fb296391f685d82dbb93621a970fb234cea45280","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"},{"lessThan":"65676cd4203c0e41a94caf54080a7f0a95434bda","status":"affected","version":"8d7b48e0bc5fa01a818eac713d4cb0763090cd0e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/autofs/waitq.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.28"},{"lessThan":"2.6.28","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.273","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.224","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.191","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.161","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.273","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.224","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.191","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.161","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.115","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"2.6.28","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.28","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"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's 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's 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."}],"providerMetadata":{"dateUpdated":"2026-10-30T12:42:44.732Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060"},{"url":"https://git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a"},{"url":"https://git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8"},{"url":"https://git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273"},{"url":"https://git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850"},{"url":"https://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704"},{"url":"https://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280"},{"url":"https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda"}],"title":"autofs: ignore notification errors from a replaced pipe","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99181","datePublished":"2026-10-28T10:35:34.443Z","dateReserved":"2026-09-25T10:25:14.399Z","dateUpdated":"2026-10-30T12:42:44.732Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:38","lastModifiedDate":"2026-10-30 13:21:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99181","Ordinal":"1","Title":"autofs: ignore notification errors from a replaced pipe","CVE":"CVE-2026-99181","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99181","Ordinal":"1","NoteData":"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's 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's 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.","Type":"Description","Title":"autofs: ignore notification errors from a replaced pipe"}]}}}