{"id":"CVE-2026-43447","state":"PUBLISHED","title":"iavf: fix PTP use-after-free during reset","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niavf: fix PTP use-after-free during reset\n\nCommit 7c01dbfc8a1c5f (\"iavf: periodically cache PHC time\") introduced a\nworker to cache PHC time, but failed to stop it during reset or disable.\n\nThis creates a race condition where `iavf_reset_task()` or\n`iavf_disable_vf()` free adapter resources (AQ) while the worker is still\nrunning. If the worker triggers `iavf_queue_ptp_cmd()` during teardown, it\naccesses freed memory/locks, leading to a crash.\n\nFix this by calling `iavf_ptp_release()` before tearing down the adapter.\nThis ensures `ptp_clock_unregister()` synchronously cancels the worker and\ncleans up the chardev before the backing resources are destroyed.","publishedAt":"2026-05-08T14:22:13.988Z","updatedAt":"2026-08-05T12:28:00.059Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"1b034f2429ce6b45ce74dc266175d277acafc5c4","versionType":"git"},{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"90cc8b2add29b57288025b51c70bc647e7cccb12","versionType":"git"},{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"efc54fb13d79117a825fef17364315a58682c7ec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/iavf/iavf_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/iavf/iavf_main.c"]}],"references":["https://git.kernel.org/stable/c/1b034f2429ce6b45ce74dc266175d277acafc5c4","https://git.kernel.org/stable/c/90cc8b2add29b57288025b51c70bc647e7cccb12","https://git.kernel.org/stable/c/efc54fb13d79117a825fef17364315a58682c7ec"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43447.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43447","state":"PUBLISHED","datePublished":"2026-05-08T14:22:13.988Z","dateUpdated":"2026-08-05T12:28:00.059Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:56.010Z"},"containers":{"cna":{"title":"iavf: fix PTP use-after-free during reset","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niavf: fix PTP use-after-free during reset\n\nCommit 7c01dbfc8a1c5f (\"iavf: periodically cache PHC time\") introduced a\nworker to cache PHC time, but failed to stop it during reset or disable.\n\nThis creates a race condition where `iavf_reset_task()` or\n`iavf_disable_vf()` free adapter resources (AQ) while the worker is still\nrunning. If the worker triggers `iavf_queue_ptp_cmd()` during teardown, it\naccesses freed memory/locks, leading to a crash.\n\nFix this by calling `iavf_ptp_release()` before tearing down the adapter.\nThis ensures `ptp_clock_unregister()` synchronously cancels the worker and\ncleans up the chardev before the backing resources are destroyed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"1b034f2429ce6b45ce74dc266175d277acafc5c4","versionType":"git"},{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"90cc8b2add29b57288025b51c70bc647e7cccb12","versionType":"git"},{"version":"7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0","status":"affected","lessThan":"efc54fb13d79117a825fef17364315a58682c7ec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/iavf/iavf_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/iavf/iavf_main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1b034f2429ce6b45ce74dc266175d277acafc5c4"},{"url":"https://git.kernel.org/stable/c/90cc8b2add29b57288025b51c70bc647e7cccb12"},{"url":"https://git.kernel.org/stable/c/efc54fb13d79117a825fef17364315a58682c7ec"}],"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 vulnerable reset/disable paths are reached through local netdevice/PTP control paths, not by processing remote packets. A local actor can trigger iavf reset via MTU/feature changes while the PTP worker or PTP clock access queues PHC reads.\nAC:L - The race can be driven repeatedly by triggering resets while the PTP aux worker runs periodically, and a privileged local actor can also issue concurrent PTP clock reads. Per kernel guidance, this use-after-free race is low complexity.\nPR:L - Reset-triggering netdevice operations require CAP_NET_ADMIN in the device's network namespace, enforced through namespace-capable checks. Since iavf devices are not netns-immutable and may be delegated to a user-owned netns/container, this is low privileges rather than init-namespace root only.\nUI:N - No victim action is required once the attacker has local access and the iavf VF with PTP support is present. The attacker can initiate the reset/clock activity directly.\nS:U - The corruption occurs within the same kernel security authority as the vulnerable iavf driver. This is standard local kernel compromise/DoS, not a guest-to-host or IOMMU boundary crossing.\nC:H - The bug is a use-after-free involving freed adapter/Admin Queue resources and locks. Following kernel guidance, UAF memory corruption can provide high confidentiality impact through exploitable kernel memory access.\nI:H - The UAF can corrupt or reuse kernel objects/resources during teardown and can plausibly be exploited for control-flow or arbitrary write primitives. Kernel guidance treats use-after-free as high integrity impact.\nA:H - The reported failure mode is a kernel crash in the PTP worker/iavf path during reset teardown. Any reproducible kernel oops/panic from this UAF is high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:28:00.059Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}