CVE-2026-31635

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The existing check is\ninverted, so oversized RESPONSE authenticators are accepted and passed\nto rxgk_decrypt_skb(), which can later reach skb_to_sgvec() with an\nimpossible length and hit BUG_ON(len).\n\nDecoded from the original latest-net reproduction logs with\nscripts/decode_stacktrace.sh:\n\nRIP: __skb_to_sgvec()\n [net/core/skbuff.c:5285 (discriminator 1)]\nCall Trace:\n skb_to_sgvec() [net/core/skbuff.c:5305]\n rxgk_decrypt_skb() [net/rxrpc/rxgk_common.h:81]\n rxgk_verify_response() [net/rxrpc/rxgk.c:1268]\n rxrpc_process_connection()\n [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364\n net/rxrpc/conn_event.c:386]\n process_one_work() [kernel/workqueue.c:3281]\n worker_thread()\n [kernel/workqueue.c:3353 kernel/workqueue.c:3440]\n kthread() [kernel/kthread.c:436]\n ret_from_fork() [arch/x86/kernel/process.c:164]\n\nReject authenticator lengths that exceed the remaining packet payload."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - RxRPC packets are received over UDP and the vulnerable RXGK RESPONSE parser is reached from the network receive path on a listening RxRPC service. A remote peer can initiate a service call, receive a challenge, and send the malformed RESPONSE packet.\nAC:L - The trigger is a deterministic oversized authenticator length in an attacker-controlled RESPONSE packet, with no race or hard-to-control timing. A valid RXGK deployment and normal handshake state are prerequisites, but not exploit-complexity conditions beyond the attacker\u2019s packet construction.\nPR:N - The vulnerable code runs during the connection authentication handshake before the RESPONSE authenticator is accepted. No privileges on the vulnerable host are required to send the network packets that reach this path.\nUI:N - No user action is required on the victim once an affected RxRPC service is listening. The attacker can drive the packet exchange directly over the network.\nS:U - The impact is within the kernel/network service security authority of the vulnerable system. There is no guest-to-host, sandbox, or other authority-boundary escape.\nC:N - The bug passes an impossible length to skb_to_sgvec(), which reaches BUG_ON(len), and the investigated path does not expose kernel memory to the attacker. This issue is a crash path, not the separate RESPONSE parser out-of-bounds read bug.\nI:N - The oversized length does not create an attacker-controlled write or control-flow primitive in the investigated path. Execution stops at the skb_to_sgvec() BUG_ON before decrypted authenticator contents are processed.\nA:H - The malformed RESPONSE can hit BUG_ON(len) in __skb_to_sgvec(), causing a kernel oops/panic-class failure. A remote attacker can repeat the handshake and malformed packet to cause denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rxrpc/rxgk.c"], "versions": [{"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "beee051f259acd286fed64c32c2b31e6f5097eb5", "status": "affected", "versionType": "git"}, {"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305", "status": "affected", "versionType": "git"}, {"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "a2567217ade970ecc458144b6be469bc015b23e5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rxrpc/rxgk.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.23", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.13", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.16", "versionEndExcluding": "6.18.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/beee051f259acd286fed64c32c2b31e6f5097eb5"}, {"url": "https://git.kernel.org/stable/c/e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305"}, {"url": "https://git.kernel.org/stable/c/a2567217ade970ecc458144b6be469bc015b23e5"}], "title": "rxrpc: fix oversized RESPONSE authenticator length check", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-130", "lang": "en", "description": "CWE-130 Improper Handling of Length Parameter Inconsistency"}]}], "references": [{"url": "https://github.com/v12-security/pocs/tree/main/dirtydecrypt", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-18T00:00:00+00:00", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-31635"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-19T03:55:26.199Z"}}]}}

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The existing check is\ninverted, so oversized RESPONSE authenticators are accepted and passed\nto rxgk_decrypt_skb(), which can later reach skb_to_sgvec() with an\nimpossible length and hit BUG_ON(len).\n\nDecoded from the original latest-net reproduction logs with\nscripts/decode_stacktrace.sh:\n\nRIP: __skb_to_sgvec()\n [net/core/skbuff.c:5285 (discriminator 1)]\nCall Trace:\n skb_to_sgvec() [net/core/skbuff.c:5305]\n rxgk_decrypt_skb() [net/rxrpc/rxgk_common.h:81]\n rxgk_verify_response() [net/rxrpc/rxgk.c:1268]\n rxrpc_process_connection()\n [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364\n net/rxrpc/conn_event.c:386]\n process_one_work() [kernel/workqueue.c:3281]\n worker_thread()\n [kernel/workqueue.c:3353 kernel/workqueue.c:3440]\n kthread() [kernel/kthread.c:436]\n ret_from_fork() [arch/x86/kernel/process.c:164]\n\nReject authenticator lengths that exceed the remaining packet payload."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrxrpc: correcci\u00f3n de la comprobaci\u00f3n de longitud de autenticador RESPONSE sobredimensionado\n\nrxgk_verify_response() decodifica auth_len del paquete y se supone que verifica que cabe en los bytes restantes. La comprobaci\u00f3n existente est\u00e1 invertida, por lo que los autenticadores RESPONSE sobredimensionados son aceptados y pasados a rxgk_decrypt_skb(), lo que puede llegar m\u00e1s tarde a skb_to_sgvec() con una longitud imposible y activar BUG_ON(len).\n\nDecodificado de los registros de reproducci\u00f3n latest-net originales con scripts/decode_stacktrace.sh:\n\nRIP: __skb_to_sgvec()\n [net/core/skbuff.c:5285 (discriminador 1)]\nTraza de Llamadas:\n skb_to_sgvec() [net/core/skbuff.c:5305]\n rxgk_decrypt_skb() [net/rxrpc/rxgk_common.h:81]\n rxgk_verify_response() [net/rxrpc/rxgk.c:1268]\n rxrpc_process_connection()\n [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364\n net/rxrpc/conn_event.c:386]\n process_one_work() [kernel/workqueue.c:3281]\n worker_thread()\n [kernel/workqueue.c:3353 kernel/workqueue.c:3440]\n kthread() [kernel/kthread.c:436]\n ret_from_fork() [arch/x86/kernel/process.c:164]\n\nRechazar longitudes de autenticador que excedan la carga \u00fatil restante del paquete."}], "id": "CVE-2026-31635", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31635", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-18T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-04-24T15:16:42.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2567217ade970ecc458144b6be469bc015b23e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/beee051f259acd286fed64c32c2b31e6f5097eb5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/v12-security/pocs/tree/main/dirtydecrypt"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-130"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: rxrpc: fix oversized RESPONSE authenticator length check", "id": "2461567", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461567"}, "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-130", "details": ["A flaw was found in the Linux kernel's rxrpc component. An inverted length check in the `rxgk_verify_response()` function allows oversized RESPONSE authenticators to be accepted. This can lead to an impossible length being passed to `skb_to_sgvec()`, triggering a `BUG_ON` condition and resulting in a system crash, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-31635", "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-2026-31635\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31635\nhttps://lore.kernel.org/linux-cve-announce/2026042455-CVE-2026-31635-73bd@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,beee051f259acd286fed64c32c2b31e6f5097eb5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a,a2567217ade970ecc458144b6be469bc015b23e5)"}}], "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": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.23,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.13,6.19.*]"}}, {"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": "2026-04-28T20:06:26.987560+00:00", "value": {"mitigation_remediation": ["Apply the latest stable Linux kernel release that contains the rxrpc oversized authenticator length patch to all affected systems.", "If a kernel upgrade cannot be performed immediately, restrict or disable external network access to the ports used by rxrpc to prevent crafted packets from reaching the kernel.", "Configure monitoring tools to alert on sudden kernel reboots or kernel panic logs related to rxrpc, so issues are detected promptly and can be addressed before service disruption."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service (Kernel Crash)"}, "threat_synthesis": {"affected_systems": "The flaw affects all Linux kernel releases that include the flawed rxrpc code. According to the provided CPE data, affected releases include the 6.16 kernel series and all 7.0 release candidates through rc7. Any system running those kernels without the fixed patch is vulnerable. Versions prior to the introduction of the vulnerability are unaffected.", "description_and_impact": "The vulnerability occurs in the Linux kernel's rxrpc implementation, where the function that verifies the length of a RESPONSE authenticator has an inverted check. This flaw, classified as CWE-130, is due to an incorrect comparison logic that accepts oversized authenticators and later causes the kernel to reach a BUG_ON, leading to a crash. This results in a denial\u2011of\u2011service condition by bringing the affected system down; there is no direct way for an attacker to gain code execution or data exfiltration.", "risk_and_exploitability": "The CVSS score of 7.5 designates a high severity, while the EPSS score of <1% indicates a very low likelihood of exploitation in the wild as of this analysis. The bug is not listed in the CISA KEV catalog. Exploitation requires an attacker to send a crafted rxrpc packet over the network, which may be difficult in environments that do not expose rxrpc services. Nevertheless, because the outcome is a system crash, the risk remains significant for systems that allow inbound rxrpc traffic."}}}}, "created": "2026-04-27T18:45:11.323786+00:00", "updated": "2026-04-28T20:15:26.809538+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}