{"api_version":"1","generated_at":"2026-05-30T17:59:36+00:00","cve":"CVE-2026-46114","urls":{"html":"https://cve.report/CVE-2026-46114","api":"https://cve.report/api/cve/CVE-2026-46114.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46114","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46114"},"summary":{"title":"RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads\n\natomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c\nunconditionally dereferences 8 bytes at payload_addr(pkt):\n\n    value = *(u64 *)payload_addr(pkt);\n\ncheck_rkey() previously accepted an ATOMIC_WRITE request with pktlen ==\nresid == 0 because the length validation only compared pktlen against\nresid. A remote initiator that sets the RETH length to 0 therefore reaches\natomic_write_reply() with a zero-byte logical payload, and the responder\nreads sizeof(u64) bytes from past the logical end of the packet into\nskb->head tailroom, then writes those 8 bytes into the attacker's MR via\nrxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel\ntailroom per probe (the other 4 bytes are the packet's own trailing ICRC).\n\nIBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is\nprotocol-invalid. Hoist a strict length check into check_rkey() so the\nresponder never reaches the unchecked dereference, and keep the existing\nWRITE-family length logic for the normal RDMA WRITE path.\n\nReproduced on mainline with an unmodified rxe driver: a sustained\nzero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer\nbytes into the attacker's MR, including recognisable kernel strings and\npartial kernel-direct-map pointer words.  With this patch applied the\nresponder rejects the PDU and the MR stays all-zero.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:26","updated_at":"2026-05-30 11:17:21"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1114c87aa6f195cf07da55a27b2122ae26557b26","name":"https://git.kernel.org/stable/c/1114c87aa6f195cf07da55a27b2122ae26557b26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/105bf79a23b85cf3a761d18a4f3e10ce88526bc1","name":"https://git.kernel.org/stable/c/105bf79a23b85cf3a761d18a4f3e10ce88526bc1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ec1ed4747f5f99f8b797bb438c5efd36079fad5","name":"https://git.kernel.org/stable/c/7ec1ed4747f5f99f8b797bb438c5efd36079fad5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d415fce3fcde6d7aeea6c25362a395b905811452","name":"https://git.kernel.org/stable/c/d415fce3fcde6d7aeea6c25362a395b905811452","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/539cabb7b2d8ba70f55bba91db55faef11c2a6d7","name":"https://git.kernel.org/stable/c/539cabb7b2d8ba70f55bba91db55faef11c2a6d7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46114","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46114","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 034e285f8b99062a0cf29112e1232154a6a44aa5 539cabb7b2d8ba70f55bba91db55faef11c2a6d7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 034e285f8b99062a0cf29112e1232154a6a44aa5 d415fce3fcde6d7aeea6c25362a395b905811452 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 034e285f8b99062a0cf29112e1232154a6a44aa5 105bf79a23b85cf3a761d18a4f3e10ce88526bc1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 034e285f8b99062a0cf29112e1232154a6a44aa5 7ec1ed4747f5f99f8b797bb438c5efd36079fad5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 034e285f8b99062a0cf29112e1232154a6a44aa5 1114c87aa6f195cf07da55a27b2122ae26557b26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46114","cve":"CVE-2026-46114","epss":"0.000520000","percentile":"0.166900000","score_date":"2026-05-29","updated_at":"2026-05-30 00:13:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/infiniband/sw/rxe/rxe_resp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"539cabb7b2d8ba70f55bba91db55faef11c2a6d7","status":"affected","version":"034e285f8b99062a0cf29112e1232154a6a44aa5","versionType":"git"},{"lessThan":"d415fce3fcde6d7aeea6c25362a395b905811452","status":"affected","version":"034e285f8b99062a0cf29112e1232154a6a44aa5","versionType":"git"},{"lessThan":"105bf79a23b85cf3a761d18a4f3e10ce88526bc1","status":"affected","version":"034e285f8b99062a0cf29112e1232154a6a44aa5","versionType":"git"},{"lessThan":"7ec1ed4747f5f99f8b797bb438c5efd36079fad5","status":"affected","version":"034e285f8b99062a0cf29112e1232154a6a44aa5","versionType":"git"},{"lessThan":"1114c87aa6f195cf07da55a27b2122ae26557b26","status":"affected","version":"034e285f8b99062a0cf29112e1232154a6a44aa5","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/infiniband/sw/rxe/rxe_resp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.2"},{"lessThan":"6.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc3","versionStartIncluding":"6.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads\n\natomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c\nunconditionally dereferences 8 bytes at payload_addr(pkt):\n\n    value = *(u64 *)payload_addr(pkt);\n\ncheck_rkey() previously accepted an ATOMIC_WRITE request with pktlen ==\nresid == 0 because the length validation only compared pktlen against\nresid. A remote initiator that sets the RETH length to 0 therefore reaches\natomic_write_reply() with a zero-byte logical payload, and the responder\nreads sizeof(u64) bytes from past the logical end of the packet into\nskb->head tailroom, then writes those 8 bytes into the attacker's MR via\nrxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel\ntailroom per probe (the other 4 bytes are the packet's own trailing ICRC).\n\nIBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is\nprotocol-invalid. Hoist a strict length check into check_rkey() so the\nresponder never reaches the unchecked dereference, and keep the existing\nWRITE-family length logic for the normal RDMA WRITE path.\n\nReproduced on mainline with an unmodified rxe driver: a sustained\nzero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer\nbytes into the attacker's MR, including recognisable kernel strings and\npartial kernel-direct-map pointer words.  With this patch applied the\nresponder rejects the PDU and the MR stays all-zero."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-30T10:47:48.782Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/539cabb7b2d8ba70f55bba91db55faef11c2a6d7"},{"url":"https://git.kernel.org/stable/c/d415fce3fcde6d7aeea6c25362a395b905811452"},{"url":"https://git.kernel.org/stable/c/105bf79a23b85cf3a761d18a4f3e10ce88526bc1"},{"url":"https://git.kernel.org/stable/c/7ec1ed4747f5f99f8b797bb438c5efd36079fad5"},{"url":"https://git.kernel.org/stable/c/1114c87aa6f195cf07da55a27b2122ae26557b26"}],"title":"RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46114","datePublished":"2026-05-28T09:35:24.638Z","dateReserved":"2026-05-13T15:03:33.098Z","dateUpdated":"2026-05-30T10:47:48.782Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:26","lastModifiedDate":"2026-05-30 11:17:21","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46114","Ordinal":"1","Title":"RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads","CVE":"CVE-2026-46114","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46114","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads\n\natomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c\nunconditionally dereferences 8 bytes at payload_addr(pkt):\n\n    value = *(u64 *)payload_addr(pkt);\n\ncheck_rkey() previously accepted an ATOMIC_WRITE request with pktlen ==\nresid == 0 because the length validation only compared pktlen against\nresid. A remote initiator that sets the RETH length to 0 therefore reaches\natomic_write_reply() with a zero-byte logical payload, and the responder\nreads sizeof(u64) bytes from past the logical end of the packet into\nskb->head tailroom, then writes those 8 bytes into the attacker's MR via\nrxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel\ntailroom per probe (the other 4 bytes are the packet's own trailing ICRC).\n\nIBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is\nprotocol-invalid. Hoist a strict length check into check_rkey() so the\nresponder never reaches the unchecked dereference, and keep the existing\nWRITE-family length logic for the normal RDMA WRITE path.\n\nReproduced on mainline with an unmodified rxe driver: a sustained\nzero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer\nbytes into the attacker's MR, including recognisable kernel strings and\npartial kernel-direct-map pointer words.  With this patch applied the\nresponder rejects the PDU and the MR stays all-zero.","Type":"Description","Title":"RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads"}]}}}