CVE-2026-99181

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99181", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.399Z", "datePublished": "2026-10-28T10:35:34.443Z", "dateUpdated": "2026-10-30T12:42:44.732Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:44.732Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/autofs/waitq.c"], "versions": [{"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "95ba5de229c1875e836f10646c4e6c454d560060", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "d3477ebdce74dc3bae404048258e70d7046c208a", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "6d2b8ad36e09e07993addd4ce92b578d3b13c8f8", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "35c2c4f3cf1403b058237c44000199a6c9a59273", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "8c8386ffc582155451f074f25759f665e626a850", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "1a177064f501ed4b67873a43aae5d5bdb18b3704", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "fb296391f685d82dbb93621a970fb234cea45280", "status": "affected", "versionType": "git"}, {"version": "8d7b48e0bc5fa01a818eac713d4cb0763090cd0e", "lessThan": "65676cd4203c0e41a94caf54080a7f0a95434bda", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/autofs/waitq.c"], "versions": [{"version": "2.6.28", "status": "affected"}, {"version": "0", "lessThan": "2.6.28", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "7.3"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-99181", "lastModified": "2026-10-30T13:21:51.783", "metrics": {}, "published": "2026-10-28T11:17:38.883", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35c2c4f3cf1403b058237c44000199a6c9a59273"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6d2b8ad36e09e07993addd4ce92b578d3b13c8f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8c8386ffc582155451f074f25759f665e626a850"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/95ba5de229c1875e836f10646c4e6c454d560060"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3477ebdce74dc3bae404048258e70d7046c208a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via improper notification pipe error handling in autofs", "id": "2562731", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562731"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nautofs: ignore notification errors from a replaced pipe\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.\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.\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.\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.\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.\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.", "A flaw was found in the Linux kernel's autofs (automount file system) subsystem. A local attacker can cause a Denial of Service (DoS) by initiating file system lookups while the automount daemon is restarting. Due to mishandled errors from an obsolete communication pipe, the kernel incorrectly shuts down the newly replaced pipe, causing subsequent autofs lookups and mount requests to fail."], "name": "CVE-2026-99181", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T10:35:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99181\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99181\nhttps://git.kernel.org/stable/c/1a177064f501ed4b67873a43aae5d5bdb18b3704\nhttps://git.kernel.org/stable/c/65676cd4203c0e41a94caf54080a7f0a95434bda\nhttps://git.kernel.org/stable/c/fb296391f685d82dbb93621a970fb234cea45280"], "statement": "This vulnerability is rated as having Moderate severity for Red Hat enterprise environments because exploitation requires unprivileged local access and precise timing during an automounter restart, resulting strictly in the disruption of autofs requests without memory corruption or privilege escalation. Although the underlying autofs subsystem is present across Red Hat Enterprise Linux installations, active risk is limited to systems where automount services are deployed to handle dynamic mounts such as network file shares. Systems where automount daemons are inactive or not exposed to untrusted local users are not susceptible to this denial of service.", "threat_severity": "Moderate"}

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