{"api_version":"1","generated_at":"2026-09-12T10:56:36+00:00","cve":"CVE-2026-89481","urls":{"html":"https://cve.report/CVE-2026-89481","api":"https://cve.report/api/cve/CVE-2026-89481.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89481","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89481"},"summary":{"title":"nvme-tcp: fix host memory disclosure on R2T for a read command","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: fix host memory disclosure on R2T for a read command\n\nnvme_tcp_handle_r2t() does not check the direction of the request the\nR2T refers to. A malicious controller can send an R2T for a READ and\nthe host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the\nH2CData header and nvme_tcp_try_send_data() sends the request's data\nbuffer. That buffer is the READ destination, so its contents go to the\ncontroller.\n\nThe command then completes normally and nothing is logged.\n\nAgainst a test controller that answers every READ with an R2T, a 4096\nbyte buffered read returned all 4096 bytes, split over two R2Ts. The\npages contained stale kernel data, including an array of struct page\npointers.\n\nReject an R2T for a request that is not a write.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:29","updated_at":"2026-09-11 20:19:29"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5","name":"https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403","name":"https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c","name":"https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8","name":"https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89481","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89481","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 a4c3c7310156493797c920b10d8648c07aa05403 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 6efbc52237facda35d2d874fe1765bb4839275d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/nvme/host/tcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a4c3c7310156493797c920b10d8648c07aa05403","status":"affected","version":"3f2304f8c6d6ed97849057bd16fee99e434ca796","versionType":"git"},{"lessThan":"3b3d27670c0c890ba7cf1bc3614cab61bde6d25c","status":"affected","version":"3f2304f8c6d6ed97849057bd16fee99e434ca796","versionType":"git"},{"lessThan":"3a0b05145053a5fad1a2ddb4e4d87b07385e63e5","status":"affected","version":"3f2304f8c6d6ed97849057bd16fee99e434ca796","versionType":"git"},{"lessThan":"6efbc52237facda35d2d874fe1765bb4839275d8","status":"affected","version":"3f2304f8c6d6ed97849057bd16fee99e434ca796","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/nvme/host/tcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.0"},{"lessThan":"5.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: fix host memory disclosure on R2T for a read command\n\nnvme_tcp_handle_r2t() does not check the direction of the request the\nR2T refers to. A malicious controller can send an R2T for a READ and\nthe host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the\nH2CData header and nvme_tcp_try_send_data() sends the request's data\nbuffer. That buffer is the READ destination, so its contents go to the\ncontroller.\n\nThe command then completes normally and nothing is logged.\n\nAgainst a test controller that answers every READ with an R2T, a 4096\nbyte buffered read returned all 4096 bytes, split over two R2Ts. The\npages contained stale kernel data, including an array of struct page\npointers.\n\nReject an R2T for a request that is not a write."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:36.589Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403"},{"url":"https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c"},{"url":"https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5"},{"url":"https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8"}],"title":"nvme-tcp: fix host memory disclosure on R2T for a read command","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89481","datePublished":"2026-09-11T19:43:36.589Z","dateReserved":"2026-09-11T19:38:34.711Z","dateUpdated":"2026-09-11T19:43:36.589Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:29","lastModifiedDate":"2026-09-11 20:19:29","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89481","Ordinal":"1","Title":"nvme-tcp: fix host memory disclosure on R2T for a read command","CVE":"CVE-2026-89481","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89481","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: fix host memory disclosure on R2T for a read command\n\nnvme_tcp_handle_r2t() does not check the direction of the request the\nR2T refers to. A malicious controller can send an R2T for a READ and\nthe host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the\nH2CData header and nvme_tcp_try_send_data() sends the request's data\nbuffer. That buffer is the READ destination, so its contents go to the\ncontroller.\n\nThe command then completes normally and nothing is logged.\n\nAgainst a test controller that answers every READ with an R2T, a 4096\nbyte buffered read returned all 4096 bytes, split over two R2Ts. The\npages contained stale kernel data, including an array of struct page\npointers.\n\nReject an R2T for a request that is not a write.","Type":"Description","Title":"nvme-tcp: fix host memory disclosure on R2T for a read command"}]}}}