{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72066", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.903Z", "datePublished": "2026-08-15T05:52:19.527Z", "dateUpdated": "2026-08-19T16:35:55.630Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:35:55.630Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpu: hotplug: Bound hotplug states sysfs output\n\nstates_show() adds CPU hotplug state names into a single sysfs buffer\nusing sprintf(). With enough registered states, this can write past the\nend of the PAGE_SIZE buffer.\n\nUse sysfs_emit_at() so output is bounded." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in states_show() on the read path for /sys/devices/system/cpu/hotplug/states, reached only via a local sysfs/VFS read() syscall. No network packet handler, adjacent protocol, or physical attach path invokes this CPU hotplug sysfs callback.\nAC:L - Once enough CPU hotplug states are registered (plausible on cloud servers, KVM hosts, Android, and heavily configured distros with hundreds of cpuhp_setup_state() users), a single read deterministically executes unbounded sprintf() past the PAGE_SIZE buffer with no race or attacker-uncontrollable timing.\nPR:L - states is DEVICE_ATTR_RO (mode 0444), so any unprivileged local user can open and read /sys/devices/system/cpu/hotplug/states. states_show() performs no capability, namespace, or credential check before formatting output into the sysfs buffer.\nUI:N - Exploitation requires only the attacker reading the sysfs attribute; no victim mount, driver bind, module load, or other interactive action is needed beyond the attacker's own read once sufficient hotplug states exist at boot.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same OS/kernel security authority. This is standard kernel memory corruption, not a KVM guest-to-host escape, IOMMU boundary bypass, or other cross-scope boundary violation.\nC:H - Unbounded sprintf() writes past the fixed PAGE_SIZE buffer allocated by sysfs_kf_seq_show(), corrupting adjacent kmalloc heap memory. Per kernel guidance, this class of memory-corruption OOB write can be leveraged for arbitrary kernel memory disclosure.\nI:H - The vulnerable loop advances buf and repeatedly sprintf()s without bounds, producing a kernel heap out-of-bounds write that can corrupt adjacent objects and enable control-flow hijacking or arbitrary kernel writes per OOB-write scoring guidance.\nA:H - Writing past the PAGE_SIZE sysfs show buffer corrupts adjacent kernel heap objects and can cause immediate kernel oops/panic during the read path or when corrupted adjacent allocations are later used, satisfying High availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/cpu.c" ], "versions": [ { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "27481cf4365a6ff5c9be3590143e7ed434000266", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "2408be459c70ef4250da1a9e50f5478e6b250d61", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "998f66e9ce320f3433f60b948e3698b744754a46", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "61a73a123ac7a7fbc57382531f8cb7092d569aba", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "6cb15b81ff545840048fb0e1a6e827d560dbf367", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "631d53102da9f469c96b882b770336bec095b833", "status": "affected", "versionType": "git" }, { "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e", "lessThan": "86f436567f2516a0083b210bedc933544826a2c3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/cpu.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.6", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/27481cf4365a6ff5c9be3590143e7ed434000266" }, { "url": "https://git.kernel.org/stable/c/2408be459c70ef4250da1a9e50f5478e6b250d61" }, { "url": "https://git.kernel.org/stable/c/de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635" }, { "url": "https://git.kernel.org/stable/c/998f66e9ce320f3433f60b948e3698b744754a46" }, { "url": "https://git.kernel.org/stable/c/61a73a123ac7a7fbc57382531f8cb7092d569aba" }, { "url": "https://git.kernel.org/stable/c/6cb15b81ff545840048fb0e1a6e827d560dbf367" }, { "url": "https://git.kernel.org/stable/c/631d53102da9f469c96b882b770336bec095b833" }, { "url": "https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3" } ], "title": "cpu: hotplug: Bound hotplug states sysfs output", "x_generator": { "engine": "bippy-1.2.0" } } } }