CVE-2026-53232

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It is not reachable through ordinary routed network packets or an unprivileged syscall path.\nAC:L - Once an affected PHY/SFP configuration has hit the failed-probe state, later SFP events reliably call the stale upstream callbacks. There is no attacker-won race or complex timing requirement in the event path.\nPR:N - An adjacent physical/link-layer attacker does not need kernel privileges or authentication to trigger SFP signal events. No CAP_NET_ADMIN or user-namespace route is required for that trigger path.\nUI:N - After the system is in the vulnerable failed-probe state, exploitation is triggered by SFP events without a victim user performing an action. The attacker can induce the relevant link/module event directly.\nS:U - The affected code and resulting impact are within the Linux kernel networking/PHY security authority. There is no VM, IOMMU, or separate-scope boundary crossing.\nC:H - The bug leaves a dangling `phy_device` upstream pointer that later SFP callbacks dereference, creating a kernel use-after-free style condition. Kernel UAF conditions are treated as capable of exposing arbitrary kernel memory.\nI:H - The stale pointer callbacks read and write fields through the freed or invalid `phy_device` and may reach attacker-influenced object contents after reuse. Kernel UAF memory corruption is treated as potentially enabling arbitrary write or code execution.\nA:H - Even without full exploitation, dereferencing the dangling upstream pointer during SFP events can crash or oops the kernel. 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{"bugzilla": {"description": "kernel: net: phy: clean the sfp upstream if phy probing fails", "id": "2492782", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492782"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-459", "details": ["A flaw was found in the Linux kernel's network PHY (Physical Layer) driver. When a PHY probing operation fails, the system does not properly clean up the SFP (Small Form-Factor Pluggable) upstream connection. This oversight leaves a dangling reference in the SFP bus, which could be accessed later during SFP events. This improper resource management may lead to system instability or unexpected behavior."], "name": "CVE-2026-53232", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53232\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53232\nhttps://lore.kernel.org/linux-cve-announce/2026062508-CVE-2026-53232-1b49@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[298e54fa810e027f1b0800d789eb862592721f08,48774e87bbaa0056819d4b52301e4692e50e3252)"}}], "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": "generic", "value": "5.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-06-25T12:45:15.561779+00:00", "updated": "2026-10-23T00:30:08.817253+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}