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{"bugzilla": {"description": "kernel: \"Dirty Frag\", RxRpc variant is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel", "id": "2468273", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468273"}, "csaw": true, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-123", "details": ["A flaw was found in the Linux kernel's RxRPC networking subsystem. When a non-linear socket buffer carrying a splice-pinned page-cache reference reaches the RxRPC authentication verification path, the kernel performs an in-place pcbc(fcrypt) decryption directly on the referenced page-cache page without first isolating the buffer with skb_copy(). An unprivileged local attacker can exploit this behavior to corrupt the page-cache contents of readable files, including sensitive system files such as /etc/passwd, and obtain root privileges. Unlike the ESP/XFRM variant, exploitation does not require unprivileged user or network namespaces, but depends on the RxRPC protocol stack (rxrpc.ko) being available on the target system."], "mitigation": {"lang": "en:us", "value": "See the security bulletin for a detailed mitigation procedure."}, "name": "CVE-2026-43500", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "libkrun", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Under investigation", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43500\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43500"], "statement": "This is an Important local privilege escalation flaw in the Linux kernel's RxRPC subsystem. An unprivileged local attacker can exploit a page-cache corruption vulnerability to gain root privileges by overwriting sensitive system files. This issue does not require unprivileged user namespaces, making it broadly applicable on Red Hat systems where the `rxrpc.ko` module is available.", "threat_severity": "Important"}

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