{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80991", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:48.187Z", "dateUpdated": "2026-10-21T12:47:22.150Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:22.150Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "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" ], "versions": [ { "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "b917f37bfcce919a969d66a044580a95b11df31c", "status": "affected", "versionType": "git" }, { "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "695acb5534a9e366efb47b40c7487fc56488b09b", "status": "affected", "versionType": "git" }, { "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "67a82e6f886beed0de8f8da08bb767e68fba952d", "status": "affected", "versionType": "git" }, { "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "66b50c31419e7946e9aa325a468ad9b64c961a25", "status": "affected", "versionType": "git" }, { "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "1cb9663789c5b7a12fcd419fcca6d6254c398252", "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/renesas/ravb.h", "drivers/net/ethernet/renesas/ravb_main.c", "drivers/net/ethernet/renesas/ravb_ptp.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "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" } ] } ] } ], "references": [ { "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" } ], "title": "net: ravb: serialize PTP clock teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }