CVE-2026-52971

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Previously, phc->active was checked without\nholding the lock, and resp was cached from ena_dev->phc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it."}], "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 ENA PHC timestamp path is reached through local PTP clock access such as opening `/dev/ptpN` and invoking `clock_gettime()`/PTP ioctls, not by remote network packets.\nAC:L - The bug is a retryable race between timestamp retrieval and ENA PHC destroy during reset/reinit, and repeated local timestamp calls can exercise the vulnerable window without special memory layout assumptions.\nPR:L - The generic PTP gettime path has no capability check; the attacker only needs local access to the PTP character device/file descriptor, which is a low-privilege local access condition.\nUI:N - No victim action is required once the attacker can access the local PTP clock interface and race it with reset/destruction activity.\nS:U - The vulnerability affects kernel memory within the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free of a coherent DMA response buffer whose contents are read back through timestamp retrieval, and under the required higher-severity rule UAF is treated as capable of high confidentiality impact.\nI:H - The stale response pointer is written through after free (`req_id` update) and may corrupt reused kernel/DMA memory, so under the UAF guidance this supports high integrity impact.\nA:H - The stale or NULL/freed pointer dereference can oops or panic the kernel during timestamp retrieval, causing 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/amazon/ena/ena_com.c"], "versions": [{"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98", "status": "affected", "versionType": "git"}, {"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "ca9ed40f28949353911dcb524ff8fff2f3409c97", "status": "affected", "versionType": "git"}, {"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "e42c755582f0960e684298762f0ab927b3778376", "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/amazon/ena/ena_com.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.17", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"}, {"url": "https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97"}, {"url": "https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"}], "title": "net: ena: PHC: Fix potential use-after-free in get_timestamp", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52971", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:23:43.033960Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:47:11.012Z"}}]}}

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Previously, phc->active was checked without\nholding the lock, and resp was cached from ena_dev->phc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it."}], "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 ENA PHC timestamp path is reached through local PTP clock access such as opening `/dev/ptpN` and invoking `clock_gettime()`/PTP ioctls, not by remote network packets.\nAC:L - The bug is a retryable race between timestamp retrieval and ENA PHC destroy during reset/reinit, and repeated local timestamp calls can exercise the vulnerable window without special memory layout assumptions.\nPR:L - The generic PTP gettime path has no capability check; the attacker only needs local access to the PTP character device/file descriptor, which is a low-privilege local access condition.\nUI:N - No victim action is required once the attacker can access the local PTP clock interface and race it with reset/destruction activity.\nS:U - The vulnerability affects kernel memory within the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free of a coherent DMA response buffer whose contents are read back through timestamp retrieval, and under the required higher-severity rule UAF is treated as capable of high confidentiality impact.\nI:H - The stale response pointer is written through after free (`req_id` update) and may corrupt reused kernel/DMA memory, so under the UAF guidance this supports high integrity impact.\nA:H - The stale or NULL/freed pointer dereference can oops or panic the kernel during timestamp retrieval, causing 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/amazon/ena/ena_com.c"], "versions": [{"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98", "status": "affected", "versionType": "git"}, {"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "ca9ed40f28949353911dcb524ff8fff2f3409c97", "status": "affected", "versionType": "git"}, {"version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c", "lessThan": "e42c755582f0960e684298762f0ab927b3778376", "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/amazon/ena/ena_com.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.17", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"}, {"url": "https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97"}, {"url": "https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"}], "title": "net: ena: PHC: Fix potential use-after-free in get_timestamp", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52971", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:23:43.033960Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:23:43.610Z"}}]}}

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{"bugzilla": {"description": "kernel: net: ena: PHC: Fix potential use-after-free in get_timestamp", "id": "2492436", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492436"}, "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 Elastic Network Adapter (ENA) driver, specifically within the Precision Time Protocol Hardware Clock (PHC) timestamp retrieval function. A race condition exists where the `get_timestamp` function could attempt to access memory that has already been freed by the `ena_com_phc_destroy` function. This use-after-free vulnerability can lead to a NULL pointer dereference, potentially causing a system crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-52971", "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": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52971\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52971\nhttps://lore.kernel.org/linux-cve-announce/2026062439-CVE-2026-52971-0bf1@gregkh/T"], "threat_severity": "Moderate"}

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