CVE-2026-100082

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-100082", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.456Z", "datePublished": "2026-11-06T18:23:02.627Z", "dateUpdated": "2026-11-06T19:08:45.432Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-06T18:23:02.627Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen-blkback: Avoid UAF when reading I/O statistics\n\nReading I/O statistics via sysfs concurrently with tearing down a\nfrontend device might result in UAF or a NULL dereference, as the\nreading of the statistics data is not synchronized with freeing the\ndata.\n\nUse a rwlock for synchronizing.\n\nThis is XSA-528 / CVE-2026-100082"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/xen-blkback/common.h", "drivers/block/xen-blkback/xenbus.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "253cff0526781e28b1b0f9fdacd74ecdc23d3ab7", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2c9ccbe0ffcff3615c7ad917c49b67571a41f21c", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "58ba056991dbcec8a75e6861cb4479ac947b69e6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b764e17313534794aeb99c901869f213e36a16ef", "status": "affected", "versionType": "git"}, 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"https://git.kernel.org/stable/c/2c9ccbe0ffcff3615c7ad917c49b67571a41f21c"}, {"url": "https://git.kernel.org/stable/c/58ba056991dbcec8a75e6861cb4479ac947b69e6"}, {"url": "https://git.kernel.org/stable/c/fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b"}, {"url": "https://git.kernel.org/stable/c/b764e17313534794aeb99c901869f213e36a16ef"}, {"url": "https://git.kernel.org/stable/c/c49934da934cf495faf782aa5d84f413221c9be6"}, {"url": "https://git.kernel.org/stable/c/b0378161c28e77e4d0e2eda3c9433ab4394d2a2f"}], "title": "xen-blkback: Avoid UAF when reading I/O statistics", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/11/06/11"}, {"url": "http://xenbits.xen.org/xsa/advisory-528.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-11-06T19:08:45.432Z"}}]}}

{}

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{"bugzilla": {"description": "kernel: kernel: xen-blkback: Denial of Service via race condition reading I/O statistics", "id": "2568424", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2568424"}, "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": ["A flaw was found in the Linux kernel's Xen block backend (xen-blkback) driver. A race condition occurs when input/output (I/O) statistics are read through the sysfs interface while a frontend device is being disconnected. Because reading the statistics is not synchronized with freeing device memory, a local user could trigger a use-after-free (UAF) or null-pointer dereference. This flaw primarily leads to a system crash resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, prevent the xen-blkback kernel module from loading:\n1. Create a configuration file to disable the module:\n# echo \"install xen-blkback /bin/false\" > /etc/modprobe.d/xen-blkback.conf\n2. Blacklist the module:\n# echo \"blacklist xen-blkback\" >> /etc/modprobe.d/xen-blkback.conf\nCaveats:\nApplying this mitigation prevents the system from functioning as a Xen storage backend host or driver domain. If the xen-blkback module is already loaded into kernel memory, a system reboot is required for these settings to take effect."}, "name": "CVE-2026-100082", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-10", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-06T18:23:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-100082\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-100082\nhttps://git.kernel.org/stable/c/253cff0526781e28b1b0f9fdacd74ecdc23d3ab7\nhttps://git.kernel.org/stable/c/2c9ccbe0ffcff3615c7ad917c49b67571a41f21c\nhttps://git.kernel.org/stable/c/58ba056991dbcec8a75e6861cb4479ac947b69e6\nhttps://git.kernel.org/stable/c/b0378161c28e77e4d0e2eda3c9433ab4394d2a2f\nhttps://git.kernel.org/stable/c/b764e17313534794aeb99c901869f213e36a16ef\nhttps://git.kernel.org/stable/c/c49934da934cf495faf782aa5d84f413221c9be6\nhttps://git.kernel.org/stable/c/fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b"], "statement": "This vulnerability is rated as Moderate severity because exploitation requires local access and precise timing during block device teardown, limiting the blast radius to a system crash without remote exposure or data compromise. Red Hat Enterprise Linux systems are typically not configured as Xen backend storage providers, meaning the xen-blkback driver is rarely loaded or active in standard deployments. In environments operating as Xen driver domains or hosts, unprivileged local users querying performance counters in sysfs while a virtual disk disconnects can trigger an unsynchronized memory access, causing a denial of service.", "threat_severity": "Moderate"}

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