CVE-2026-98257

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98257", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.332Z", "datePublished": "2026-10-06T08:45:22.722Z", "dateUpdated": "2026-10-19T09:16:28.470Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:28.470Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: use rds_conn_drop() on protocol version mismatch\n\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn->c_cm_lock held. When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\n\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\n\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously. Use\nit here as well."}], "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 - The bad input is dp_protocol_major/minor in the peer's RDMA-CM REP private data, which rds_ib_cm_connect_complete() reads on RDMA_CM_EVENT_ESTABLISHED from rds_rdma_cm_event_handler_cmn(). RDS/IB runs over RoCEv2, whose CM messages travel over routable UDP/IP, so a remote peer supplies the version that hits the rds_conn_destroy() branch.\nAC:L - The attacker produces the active-side state: connect to the RDS listener, then disconnect. IB has no lower-address rule in rds_queue_reconnect(), so the hashed conn reconnects to the attacker, who replies with version 3.0. The deadlock then fires every time.\nPR:N - RDS/IB connection setup has no authentication. rds_ib_cm_handle_connect() only checks the protocol version from the request, and the REP private data the fix concerns is taken from the peer as-is.\nUI:N - No local user action is needed. The victim kernel's own reconnect worker (rds_connect_worker via rds_queue_reconnect) starts the outgoing connection after the attacker drops the first one.\nS:U - The impact is a deadlock inside the same kernel that processes the RDMA-CM event. No VM, IOMMU or sandbox boundary is crossed.\nC:N - rds_conn_destroy() blocks in flush_work(&cp->cp_down_w) before it reaches kmem_cache_free(), so the conn is never freed and then used. No memory is disclosed.\nI:N - No memory is corrupted. The fault is a lock-ordering deadlock between the CM handler holding c_cm_lock and rds_conn_shutdown() waiting for it, not a write to freed or out-of-bounds memory.\nA:H - The RDMA-CM event worker blocks forever in flush_work() while holding c_cm_lock, and the RDS shutdown work blocks on mutex_lock(&cp->cp_cm_lock). This stalls the RDS connection workqueues and CM event handling for good, and the attacker can repeat it against new connections."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rds/ib_cm.c"], "versions": [{"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "424019be3f637da76b74f44a40034669acbb166f", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "14fb90067d13f4494cff0f03243fae3cf2911cbc", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "344c72a0bc2703a6de4918ed935850e07dae3af2", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "b5c9f2951d330d4a198a64d6e60f79b4bd6ef078", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "d392b16acd0908f077289aad8bba066ff16de336", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "65ca0a5037152a5a80b8fe6aac80eb80458be573", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8", "status": "affected", "versionType": "git"}, {"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "lessThan": "f97d8c7bab7843631206a114986c9059da03efeb", "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/rds/ib_cm.c"], "versions": [{"version": "2.6.37", "status": "affected"}, {"version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.37", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/424019be3f637da76b74f44a40034669acbb166f"}, {"url": "https://git.kernel.org/stable/c/14fb90067d13f4494cff0f03243fae3cf2911cbc"}, {"url": "https://git.kernel.org/stable/c/344c72a0bc2703a6de4918ed935850e07dae3af2"}, {"url": "https://git.kernel.org/stable/c/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078"}, {"url": "https://git.kernel.org/stable/c/d392b16acd0908f077289aad8bba066ff16de336"}, {"url": "https://git.kernel.org/stable/c/65ca0a5037152a5a80b8fe6aac80eb80458be573"}, {"url": "https://git.kernel.org/stable/c/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8"}, {"url": "https://git.kernel.org/stable/c/f97d8c7bab7843631206a114986c9059da03efeb"}], "title": "rds: ib: use rds_conn_drop() on protocol version mismatch", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/rds/ib_cm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "424019be3f637da76b74f44a40034669acbb166f", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "14fb90067d13f4494cff0f03243fae3cf2911cbc", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "344c72a0bc2703a6de4918ed935850e07dae3af2", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "b5c9f2951d330d4a198a64d6e60f79b4bd6ef078", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "d392b16acd0908f077289aad8bba066ff16de336", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "65ca0a5037152a5a80b8fe6aac80eb80458be573", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}, {"lessThan": "f97d8c7bab7843631206a114986c9059da03efeb", "status": "affected", "version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/rds/ib_cm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.37"}, {"lessThan": "2.6.37", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: use rds_conn_drop() on protocol version mismatch\n\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn->c_cm_lock held. When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\n\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\n\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously. Use\nit here as well."}], "id": "CVE-2026-98257", "lastModified": "2026-10-19T10:18:26.740", "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"}]}, "published": "2026-10-06T09:18:14.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/14fb90067d13f4494cff0f03243fae3cf2911cbc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/344c72a0bc2703a6de4918ed935850e07dae3af2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/424019be3f637da76b74f44a40034669acbb166f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65ca0a5037152a5a80b8fe6aac80eb80458be573"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d392b16acd0908f077289aad8bba066ff16de336"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f97d8c7bab7843631206a114986c9059da03efeb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: rds: ib: use rds_conn_drop() on protocol version mismatch", "id": "2546437", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546437"}, "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-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nrds: ib: use rds_conn_drop() on protocol version mismatch\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn->c_cm_lock held. When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously. Use\nit here as well.", "A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) subsystem. A remote attacker can trigger a Denial of Service (DoS) by negotiating an incompatible protocol version during connection establishment. This mismatch causes the kernel to attempt a synchronous connection teardown while retaining an internal lock, resulting in a deadlock. Consequently, connection workqueues stall permanently, disrupting network communication."], "name": "CVE-2026-98257", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98257\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98257\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98257.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,424019be3f637da76b74f44a40034669acbb166f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,14fb90067d13f4494cff0f03243fae3cf2911cbc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,344c72a0bc2703a6de4918ed935850e07dae3af2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,b5c9f2951d330d4a198a64d6e60f79b4bd6ef078)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,d392b16acd0908f077289aad8bba066ff16de336)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,65ca0a5037152a5a80b8fe6aac80eb80458be573)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f147dd9ecabf23fd63d2562ffe64252a0453ecde,f97d8c7bab7843631206a114986c9059da03efeb)"}}], "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": "2.6.37"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.37)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.0,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.0,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.0,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.0,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.0,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.0,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.0,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc4,*]"}}], "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": "2026-10-06T12:45:17.643953+00:00", "updated": "2026-10-11T04:45:17.733248+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}