{"id":"CVE-2026-80991","state":"PUBLISHED","title":"net: ravb: serialize PTP clock teardown","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: serialize PTP clock teardown\n\nravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to\nptp_clock_event() while ptp_clock_unregister() is freeing it. This can\nlead to a use-after-free.\n\nUse READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.\nAtomically detach it with xchg() before disabling PTP interrupts, then\nsynchronize all IRQs which can invoke ravb_ptp_interrupt() before\nunregistering the detached clock.\n\nA handler which read the old pointer completes before the clock is\nunregistered, while later handlers read NULL and skip the event.","publishedAt":"2026-09-11T19:42:48.187Z","updatedAt":"2026-10-30T12:31:37.536Z","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":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"0400b9c5608933289bcacc3886dd3e4f6b7695f1","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"b917f37bfcce919a969d66a044580a95b11df31c","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"695acb5534a9e366efb47b40c7487fc56488b09b","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"67a82e6f886beed0de8f8da08bb767e68fba952d","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"66b50c31419e7946e9aa325a468ad9b64c961a25","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"1cb9663789c5b7a12fcd419fcca6d6254c398252","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/renesas/ravb.h","drivers/net/ethernet/renesas/ravb_main.c","drivers/net/ethernet/renesas/ravb_ptp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","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/renesas/ravb.h","drivers/net/ethernet/renesas/ravb_main.c","drivers/net/ethernet/renesas/ravb_ptp.c"]}],"references":["https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1","https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c","https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b","https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d","https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25","https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80991.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80991","state":"PUBLISHED","datePublished":"2026-09-11T19:42:48.187Z","dateUpdated":"2026-10-30T12:31:37.536Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.811Z"},"containers":{"cna":{"title":"net: ravb: serialize PTP clock teardown","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: serialize PTP clock teardown\n\nravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to\nptp_clock_event() while ptp_clock_unregister() is freeing it. This can\nlead to a use-after-free.\n\nUse READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.\nAtomically detach it with xchg() before disabling PTP interrupts, then\nsynchronize all IRQs which can invoke ravb_ptp_interrupt() before\nunregistering the detached clock.\n\nA handler which read the old pointer completes before the clock is\nunregistered, while later handlers read NULL and skip the event."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"0400b9c5608933289bcacc3886dd3e4f6b7695f1","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"b917f37bfcce919a969d66a044580a95b11df31c","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"695acb5534a9e366efb47b40c7487fc56488b09b","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"67a82e6f886beed0de8f8da08bb767e68fba952d","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"66b50c31419e7946e9aa325a468ad9b64c961a25","versionType":"git"},{"version":"a0d2f20650e81407d8e51ad2cbdc492861c74e9c","status":"affected","lessThan":"1cb9663789c5b7a12fcd419fcca6d6254c398252","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/renesas/ravb.h","drivers/net/ethernet/renesas/ravb_main.c","drivers/net/ethernet/renesas/ravb_ptp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","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/renesas/ravb.h","drivers/net/ethernet/renesas/ravb_main.c","drivers/net/ethernet/renesas/ravb_ptp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1"},{"url":"https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c"},{"url":"https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"},{"url":"https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d"},{"url":"https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"},{"url":"https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"}],"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 UAF is reached from the ravb gPTP IRQ handler (ravb_interrupt/ravb_multi_interrupt → ravb_ptp_interrupt → ptp_clock_event) racing local ravb_ptp_stop teardown (close, suspend, TX-timeout work, ethtool ringparam). GIS_PTCF capture IRQs come from the on-chip AVB timer, not from parsing received Ethernet frames.\nAC:L - The attacker drives both sides: ordinary sockets or automotive idle autosuspend trigger ravb_ptp_stop, and PTP_EXTTS_REQUEST on /dev/ptpX (write fd, no CAP_SYS_TIME) enables capture IRQs. Pre-fix stop cleared GIC then called ptp_clock_unregister without synchronize_irq, so an in-flight handler can be raced repeatedly.\nPR:L - On Renesas R-Car/RZ automotive and industrial systems, unprivileged traffic arms ravb_tx_timeout_work and platform autosleep calls ravb_close without CAP_NET_ADMIN; EXTTS enable needs only a writable PTP chardev, not host root. This matches CVE-2025-21801 and CVE-2023-52509 ravb scoring.\nUI:N - Interface teardown runs from the TX watchdog or from automatic suspend/idle power management on the affected platforms, with no separate victim user action required.\nS:U - The use-after-free corrupts the host kernel's struct ptp_clock heap object within a single kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ptp_clock_event takes ptp->tsevqs_lock and walks the timestamp queue list after ptp_clock_release has kfree'd the clock, so reclaiming that slab provides an arbitrary kernel-memory read primitive.\nI:H - The same IRQ-context UAF writes via enqueue_external_timestamp into list-queue objects the attacker can reclaim, yielding a kernel heap write primitive suitable for control-flow hijacking.\nA:H - Use-after-free of struct ptp_clock in hardirq context causes a kernel oops or panic and takes down the system's primary Ethernet interface."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:37.536Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}