{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43447", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.010Z", "datePublished": "2026-05-08T14:22:13.988Z", "dateUpdated": "2026-08-05T12:28:00.059Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:00.059Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/intel/iavf/iavf_main.c" ], "versions": [ { "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "lessThan": "1b034f2429ce6b45ce74dc266175d277acafc5c4", "status": "affected", "versionType": "git" }, { "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "lessThan": "90cc8b2add29b57288025b51c70bc647e7cccb12", "status": "affected", "versionType": "git" }, { "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "lessThan": "efc54fb13d79117a825fef17364315a58682c7ec", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/intel/iavf/iavf_main.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "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" } ] } ] } ], "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" } ], "title": "iavf: fix PTP use-after-free during reset", "x_generator": { "engine": "bippy-1.2.0" } } } }