CVE-2026-43447

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/iavf/iavf_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1b034f2429ce6b45ce74dc266175d277acafc5c4", "status": "affected", "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "versionType": "git"}, {"lessThan": "90cc8b2add29b57288025b51c70bc647e7cccb12", "status": "affected", "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "versionType": "git"}, {"lessThan": "efc54fb13d79117a825fef17364315a58682c7ec", "status": "affected", "version": "7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/iavf/iavf_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.19", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6461E17-9936-4679-8F97-568871A6FBE4", "versionEndExcluding": "6.18.19", "versionStartIncluding": "6.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niavf: corrige uso despu\u00e9s de liberaci\u00f3n de PTP durante el reinicio\n\nEl commit 7c01dbfc8a1c5f (\u2019iavf: cachear peri\u00f3dicamente la hora PHC\u2019) introdujo un worker para cachear la hora PHC, pero no lo detuvo durante el reinicio o la deshabilitaci\u00f3n.\n\nEsto crea una condici\u00f3n de carrera donde \u2019iavf_reset_task()\u2019 o \u2019iavf_disable_vf()\u2019 liberan recursos del adaptador (AQ) mientras el worker sigue en ejecuci\u00f3n. Si el worker activa \u2019iavf_queue_ptp_cmd()\u2019 durante el desmontaje, accede a memoria/bloqueos liberados, lo que lleva a un fallo.\n\nSolucione esto llamando a \u2019iavf_ptp_release()\u2019 antes de desmontar el adaptador. Esto asegura que \u2019ptp_clock_unregister()\u2019 cancela sincr\u00f3nicamente el worker y limpia el chardev antes de que se destruyan los recursos de respaldo."}], "id": "CVE-2026-43447", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-08T15:16:57.217", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b034f2429ce6b45ce74dc266175d277acafc5c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90cc8b2add29b57288025b51c70bc647e7cccb12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efc54fb13d79117a825fef17364315a58682c7ec"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iavf: fix PTP use-after-free during reset", "id": "2468225", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468225"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's iavf driver. A race condition exists where the Precision Time Protocol (PTP) worker attempts to access adapter resources that have already been freed during a reset or disable operation. This use-after-free vulnerability can lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-43447", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43447\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43447\nhttps://lore.kernel.org/linux-cve-announce/2026050856-CVE-2026-43447-5a2b@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0,1b034f2429ce6b45ce74dc266175d277acafc5c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0,90cc8b2add29b57288025b51c70bc647e7cccb12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0,efc54fb13d79117a825fef17364315a58682c7ec)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T18:15:13.667560+00:00", "updated": "2026-05-21T18:45:17.085177+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}