{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72012", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.899Z", "datePublished": "2026-08-15T05:51:41.222Z", "dateUpdated": "2026-08-23T12:46:24.402Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:24.402Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/osnoise: Call synchronize_rcu() when unregistering\n\nThis ensures that any RCU readers traversing the instance list\nhave finished, before releasing the reference on the tracer that\nthe instance points to." } ], "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 - Exploitation requires writing tracefs (e.g. enabling osnoise/timerlat via current_tracer and deleting a tracing instance); there is no network, adjacent, or physical entry path to osnoise_unregister_instance().\nAC:L - An attacker who can configure tracing controls both teardown and sampling; deleting a trace instance while osnoise/timerlat is active races RCU readers that still dereference inst->tr, and this race is reliably attacker-driven.\nPR:L - Triggering requires tracefs write access to configure/destroy tracing instances; this is not init-namespace root on every system (tracing group/remounted tracefs or CAP_SYS_ADMIN in a container with tracefs mounted suffices).\nUI:N - No victim interaction is required; exploitation is achieved entirely by the attacker's tracing configuration and concurrent instance teardown.\nS:U - The use-after-free corrupts kernel memory within the same kernel security domain; it does not cross VM, IOMMU, or sandbox boundaries by itself.\nC:H - Deferred kvfree_rcu_mightsleep() lets __remove_instance() free the trace_array while RCU readers in IRQ/NMI/timerlat paths still dereference inst->tr, a classic UAF enabling arbitrary kernel memory disclosure.\nI:H - The dangling trace_array pointer can be leveraged for heap corruption and control-flow hijack; UAF of kernel heap objects is scored as high integrity impact even when the immediate failure mode is a crash.\nA:H - Concurrent access to a freed trace_array causes kernel oops/panic from RCU list walkers and buffer operations; UAF in interrupt context can crash or hang the system even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/trace_osnoise.c" ], "versions": [ { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "428cedade9b2cc8e48f00742df0cfd770e77a803", "status": "affected", "versionType": "git" }, { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "3c693635bb7b3a9b6645831a84fed2af46cdf249", "status": "affected", "versionType": "git" }, { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "38366140dc8ee3568c7f0191d517e117963bd580", "status": "affected", "versionType": "git" }, { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "fad36954b29592ce463254179c3043697678481f", "status": "affected", "versionType": "git" }, { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "dd0160a0842337f12e7694d68b184050afc6d3a4", "status": "affected", "versionType": "git" }, { "version": "a6ed2aee54644cfa2d04ca86308767f5c3a087e8", "lessThan": "fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a", "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/trace/trace_osnoise.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "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": "5.17", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/428cedade9b2cc8e48f00742df0cfd770e77a803" }, { "url": "https://git.kernel.org/stable/c/3c693635bb7b3a9b6645831a84fed2af46cdf249" }, { "url": "https://git.kernel.org/stable/c/38366140dc8ee3568c7f0191d517e117963bd580" }, { "url": "https://git.kernel.org/stable/c/fad36954b29592ce463254179c3043697678481f" }, { "url": "https://git.kernel.org/stable/c/dd0160a0842337f12e7694d68b184050afc6d3a4" }, { "url": "https://git.kernel.org/stable/c/fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a" } ], "title": "tracing/osnoise: Call synchronize_rcu() when unregistering", "x_generator": { "engine": "bippy-1.2.0" } } } }