{"api_version":"1","generated_at":"2026-09-11T23:40:10+00:00","cve":"CVE-2026-89530","urls":{"html":"https://cve.report/CVE-2026-89530","api":"https://cve.report/api/cve/CVE-2026-89530.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89530","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89530"},"summary":{"title":"svcrdma: Reject inline replies that overflow the pull-up buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject inline replies that overflow the pull-up buffer\n\nAn RPC-over-RDMA client can request a reply, such as an NFS READ\npayload, without providing a Write list or a Reply chunk to carry\nit. When such a reply needs more scatter/gather entries than the\ndevice's Send Queue supports, svc_rdma_pull_up_needed() selects\npull-up and svc_rdma_pull_up_reply_msg() linearizes the whole\nreply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size\nbytes, while the reply on this path is bounded only by the client's\nrequest, so svc_rdma_xb_linearize() copies past the end of the\nbuffer and corrupts adjacent slab memory. The oversized length is\nthen stored in sc_sges[0].length and posted, so the device also\nreads beyond the mapped region.\n\nThe SGE-exhaustion branch is the only pull-up path that can exceed\nthe buffer: the threshold branch pulls up only replies smaller\nthan RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE\nbudget are sent directly without linearization. Make\nsvc_rdma_pull_up_needed() report -E2BIG when the reply it would\npull up cannot fit sc_max_req_size, and fail the request with\nERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping\nthe connection.\n\nThe helper no longer answers a simple yes/no question: it now\nreports pull-up, no pull-up, or -E2BIG for a reply too large to\nlinearize. Rename svc_rdma_pull_up_needed() to\nsvc_rdma_check_pull_up() so its name no longer implies a boolean\npredicate.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:35","updated_at":"2026-09-11 20:19:35"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2","name":"https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5","name":"https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf","name":"https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860","name":"https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89530","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89530","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e248aa7be86e8179f20ac0931774ecd746f3f5bf fcd91b9957462d398792201c239dffaeff1cc8b2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e248aa7be86e8179f20ac0931774ecd746f3f5bf 1949dd1576f7a8aa161b1330c6125df9d53046d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e248aa7be86e8179f20ac0931774ecd746f3f5bf 8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e248aa7be86e8179f20ac0931774ecd746f3f5bf 0fbe20dfe74b783d255bf389a6ea77aa25dc7860 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b65b18f817d9ada2bf67351f24bdcce6789a0bb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d564356e1919d1178568c19af410cfc1a9076663 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.22 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.20.9 4.21 semver","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":["net/sunrpc/xprtrdma/svc_rdma_sendto.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"fcd91b9957462d398792201c239dffaeff1cc8b2","status":"affected","version":"e248aa7be86e8179f20ac0931774ecd746f3f5bf","versionType":"git"},{"lessThan":"1949dd1576f7a8aa161b1330c6125df9d53046d5","status":"affected","version":"e248aa7be86e8179f20ac0931774ecd746f3f5bf","versionType":"git"},{"lessThan":"8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf","status":"affected","version":"e248aa7be86e8179f20ac0931774ecd746f3f5bf","versionType":"git"},{"lessThan":"0fbe20dfe74b783d255bf389a6ea77aa25dc7860","status":"affected","version":"e248aa7be86e8179f20ac0931774ecd746f3f5bf","versionType":"git"},{"status":"affected","version":"9b65b18f817d9ada2bf67351f24bdcce6789a0bb","versionType":"git"},{"status":"affected","version":"d564356e1919d1178568c19af410cfc1a9076663","versionType":"git"},{"lessThan":"4.20","status":"affected","version":"4.19.22","versionType":"semver"},{"lessThan":"4.21","status":"affected","version":"4.20.9","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sunrpc/xprtrdma/svc_rdma_sendto.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},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject inline replies that overflow the pull-up buffer\n\nAn RPC-over-RDMA client can request a reply, such as an NFS READ\npayload, without providing a Write list or a Reply chunk to carry\nit. When such a reply needs more scatter/gather entries than the\ndevice's Send Queue supports, svc_rdma_pull_up_needed() selects\npull-up and svc_rdma_pull_up_reply_msg() linearizes the whole\nreply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size\nbytes, while the reply on this path is bounded only by the client's\nrequest, so svc_rdma_xb_linearize() copies past the end of the\nbuffer and corrupts adjacent slab memory. The oversized length is\nthen stored in sc_sges[0].length and posted, so the device also\nreads beyond the mapped region.\n\nThe SGE-exhaustion branch is the only pull-up path that can exceed\nthe buffer: the threshold branch pulls up only replies smaller\nthan RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE\nbudget are sent directly without linearization. Make\nsvc_rdma_pull_up_needed() report -E2BIG when the reply it would\npull up cannot fit sc_max_req_size, and fail the request with\nERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping\nthe connection.\n\nThe helper no longer answers a simple yes/no question: it now\nreports pull-up, no pull-up, or -E2BIG for a reply too large to\nlinearize. Rename svc_rdma_pull_up_needed() to\nsvc_rdma_check_pull_up() so its name no longer implies a boolean\npredicate."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:44:10.024Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2"},{"url":"https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5"},{"url":"https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf"},{"url":"https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860"}],"title":"svcrdma: Reject inline replies that overflow the pull-up buffer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89530","datePublished":"2026-09-11T19:44:10.024Z","dateReserved":"2026-09-11T19:38:34.719Z","dateUpdated":"2026-09-11T19:44:10.024Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:35","lastModifiedDate":"2026-09-11 20:19:35","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89530","Ordinal":"1","Title":"svcrdma: Reject inline replies that overflow the pull-up buffer","CVE":"CVE-2026-89530","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89530","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject inline replies that overflow the pull-up buffer\n\nAn RPC-over-RDMA client can request a reply, such as an NFS READ\npayload, without providing a Write list or a Reply chunk to carry\nit. When such a reply needs more scatter/gather entries than the\ndevice's Send Queue supports, svc_rdma_pull_up_needed() selects\npull-up and svc_rdma_pull_up_reply_msg() linearizes the whole\nreply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size\nbytes, while the reply on this path is bounded only by the client's\nrequest, so svc_rdma_xb_linearize() copies past the end of the\nbuffer and corrupts adjacent slab memory. The oversized length is\nthen stored in sc_sges[0].length and posted, so the device also\nreads beyond the mapped region.\n\nThe SGE-exhaustion branch is the only pull-up path that can exceed\nthe buffer: the threshold branch pulls up only replies smaller\nthan RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE\nbudget are sent directly without linearization. Make\nsvc_rdma_pull_up_needed() report -E2BIG when the reply it would\npull up cannot fit sc_max_req_size, and fail the request with\nERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping\nthe connection.\n\nThe helper no longer answers a simple yes/no question: it now\nreports pull-up, no pull-up, or -E2BIG for a reply too large to\nlinearize. Rename svc_rdma_pull_up_needed() to\nsvc_rdma_check_pull_up() so its name no longer implies a boolean\npredicate.","Type":"Description","Title":"svcrdma: Reject inline replies that overflow the pull-up buffer"}]}}}