{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72465", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.933Z", "datePublished": "2026-08-15T05:57:08.767Z", "dateUpdated": "2026-08-17T05:44:31.793Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:31.793Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Sanitize the reply credit grant after parsing\n\nThe out_norqst exit in rpcrdma_reply_handler() branches away before\nthe credit clamp, so a reply that matches no pending request reaches\nout_post carrying the raw credit value parsed from the wire.\nrpcrdma_post_recvs() does not bound its @needed argument: the refill\nloop allocates and chains Receive WRs until the count is satisfied or\nallocation fails. A peer that sends a well-formed reply carrying an\nunknown XID and an inflated credit grant therefore drives rep\nallocation and Receive posting past re_max_requests on every such\nreply.\n\nMove the clamp to immediately after the credit field is parsed,\nahead of the first branch that can reach out_post, so every later\nconsumer sees a sanitized value. The cwnd update stays on the\nmatched-request path." } ], "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 flaw is in the NFS-over-RDMA client receive path: rpcrdma_wc_receive() delivers remote RDMA reply completions to rpcrdma_reply_handler(), so a malicious or compromised NFS/RDMA server can send crafted replies over InfiniBand/RoCE/iWARP without local access.\nAC:L - On an established RPC/RDMA session the peer fully controls inbound replies and can reliably send well-formed headers with an unknown XID and an inflated credit grant on every message, deterministically reaching out_norqst and out_post without races or special victim state.\nPR:N - Exploitation requires only network reachability as the connected RDMA/RPC peer; the attacker does not need local accounts, mount privileges, or namespaced capabilities on the victim NFS client to deliver malicious reply traffic.\nUI:N - Once an NFS-over-RDMA mount and transport session exist, the attacker can flood spurious replies during normal client-server communication without any additional victim or administrator action at exploit time.\nS:U - Impact is confined to excessive kernel memory allocation and denial of service within the NFS client's SUNRPC/xprtrdma transport; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The bug is unbounded receive-buffer allocation driven by an unsanitized wire credit field, not an out-of-bounds read, use-after-free, or other memory disclosure primitive that exposes kernel data to the attacker.\nI:N - Inflated credits only cause rpcrdma_post_recvs() to allocate and post extra rpcrdma_rep objects; there is no demonstrated memory corruption, arbitrary write, or control-flow hijack primitive.\nA:H - Each spurious reply can drive rpcrdma_rep_create() far past re_max_requests until allocation fails, enabling repeated remote kernel memory exhaustion, OOM conditions, and loss of NFS-over-RDMA service on the client." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/xprtrdma/rpc_rdma.c" ], "versions": [ { "version": "d01d6670c169316115b26dfb3585a73dfe40b563", "lessThan": "7cf332b3d82d73ffceedca6b4a120be074172021", "status": "affected", "versionType": "git" }, { "version": "d1b159356a3584943192712392fcb2439aafb8c1", "lessThan": "41634242140173eabbf54f899f9c70b5c685e786", "status": "affected", "versionType": "git" }, { "version": "17da9e0caa8615f6fc3b4022eadbd78a9aea1a2a", "lessThan": "8be1bb378def94a5cb8f7527a191e476407118ec", "status": "affected", "versionType": "git" }, { "version": "e7ae0883c8c89b901226de43862184bf37054338", "lessThan": "469b22376ee73369711ecf2761bd122ef4195963", "status": "affected", "versionType": "git" }, { "version": "704f3f640f72db4d44ec5ce3db8d4e150c974bc7", "lessThan": "33db78b1b24fc6a464ae08aa4d2538c5f883eb5e", "status": "affected", "versionType": "git" }, { "version": "704f3f640f72db4d44ec5ce3db8d4e150c974bc7", "lessThan": "c3a628aab2dc8f5fd7bff86ceaeae64de590e60a", "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/sunrpc/xprtrdma/rpc_rdma.c" ], "versions": [ { "version": "7.1", "status": "affected" }, { "version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "7.1", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7cf332b3d82d73ffceedca6b4a120be074172021" }, { "url": "https://git.kernel.org/stable/c/41634242140173eabbf54f899f9c70b5c685e786" }, { "url": "https://git.kernel.org/stable/c/8be1bb378def94a5cb8f7527a191e476407118ec" }, { "url": "https://git.kernel.org/stable/c/469b22376ee73369711ecf2761bd122ef4195963" }, { "url": "https://git.kernel.org/stable/c/33db78b1b24fc6a464ae08aa4d2538c5f883eb5e" }, { "url": "https://git.kernel.org/stable/c/c3a628aab2dc8f5fd7bff86ceaeae64de590e60a" } ], "title": "xprtrdma: Sanitize the reply credit grant after parsing", "x_generator": { "engine": "bippy-1.2.0" } } } }