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{"bugzilla": {"description": "kernel: rxrpc: Fix integer overflow in rxgk_verify_response()", "id": "2461520", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461520"}, "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-190", "details": ["A flaw was found in the Linux kernel's rxrpc component. A potential integer overflow vulnerability exists in the `rxgk_verify_response()` function. This occurs when the `token_len` value is rounded up before a critical length check, allowing the check to be bypassed. This could potentially lead to unexpected behavior or resource exhaustion, as the response is intended to fit within a single User Datagram Protocol (UDP) packet."], "name": "CVE-2026-31633", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31633\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31633\nhttps://lore.kernel.org/linux-cve-announce/2026042454-CVE-2026-31633-8b07@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,1f864d9daaf622aeaa774404fd51e7d6a435b046)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,c1e242beb6b1efc3c286f617e8d940c8fbf2ed41)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,699e52180f4231c257821c037ed5c99d5eb0edb8)"}}], "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": "semver", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.23,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.13,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T13:54:27.957088+00:00", "value": {"mitigation_remediation": ["Upgrade the kernel to a release that includes the rxrpc integer overflow fix.", "If immediate upgrading is not possible, block or rate\u2011limit inbound rxrpc UDP traffic (typically port 2000) using firewall rules or network segmentation to prevent malicious packets.", "If the system does not use the rxrpc protocol, disable it by setting the sysctl net.rpc.dgram=0 and verify that the kernel is configured accordingly."], "summary": {"action": "Immediate Patch", "impact": "Integer Overflow (CWE-190)"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all Linux kernels that incorporate the unpatched rxrpc code. According to the CPE list and affected version data, kernels 6.16 and all 7.0 release candidates up to rc7 are vulnerable. Any distribution running one of these kernels without the patch is impacted.", "description_and_impact": "The Linux kernel contains an integer overflow in the rxgk_verify_response() routine of the rxrpc implementation. The overflow occurs when the code rounds up token_len before validating it against the packet length, allowing malformed packets to bypass the size check. This flaw can cause memory corruption or kernel instability when processed. The weakness is classified as CWE\u2011190.", "risk_and_exploitability": "The CVSS score of 9.8 marks the issue as critical, while the EPSS score of <\u202f1\u202f% indicates a low but non\u2011zero likelihood of exploitation. The vulnerability is not in the CISA KEV catalog. Based on the description, it is inferred that exploitation would be achieved remotely via a crafted UDP packet sent to the rxrpc port, leveraging the untrusted network input."}}}}, "created": "2026-04-27T18:45:11.324693+00:00", "updated": "2026-04-28T14:00:16.503600+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}