{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89528", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.719Z", "datePublished": "2026-09-11T19:44:08.514Z", "dateUpdated": "2026-10-21T12:47:41.509Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:41.509Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject Read lists that exceed the page budget\n\nIndividual Read segment lengths are validated at decode time, but\nnothing prevents a requester from sending multiple segments whose\ncumulative length exceeds the rq_pages array budget. When one\nsegment fills the page array exactly, the runtime guard in\nsvc_rdma_build_read_segment() is bypassed because len reaches zero.\nA subsequent segment then accesses the NULL sentinel slot at\nrq_pages[rq_maxpages], resulting in a NULL pointer dereference during\nDMA mapping.\n\nAccumulate pages across all Read segments and reject the message at\ndecode time when the total would overflow the page budget." } ], "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 - svcrdma is nfsd's RPC-over-RDMA server transport; a remote peer reaches svc_rdma_recvfrom() by sending a Call with a Read list on an enabled NFS/RDMA listener over routable RoCEv2 or iWARP.\nAC:L - The attacker fully controls Read-segment lengths in the transport header and can deterministically fill rq_pages exactly, then send a further segment so the len==0 overrun guard is skipped and the NULL sentinel is DMA-mapped, with no race or uncontrollable layout.\nPR:N - xdr_count_read_segments() and svc_rdma_build_read_segment() run in svc_rdma_recvfrom() while assembling the transport message, before svc_process() performs RPC or NFS authentication, and RDMA CM accept has no credential check.\nUI:N - Sending a crafted RPC-over-RDMA message with an over-budget Read list is sufficient; no victim mount, click, or other user action is required.\nS:U - The NULL dereference oops stays in the host kernel that owns nfsd/svcrdma; this is not a VM, IOMMU, or sandbox escape.\nC:N - The fault is a NULL pointer dereference of the rq_pages[rq_maxpages] sentinel during DMA mapping; the access faults immediately and does not disclose kernel memory.\nI:N - The sentinel slot is a guaranteed NULL page pointer, not an out-of-bounds page used as a write destination; DMA mapping aborts on the NULL page without an arbitrary-write or control-flow hijack primitive.\nA:H - DMA mapping the NULL sentinel produces a kernel oops or panic that an unauthenticated NFS/RDMA peer can trigger repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/xprtrdma/svc_rdma_recvfrom.c" ], "versions": [ { "version": "026d958b38c628a1b4ced534808945365e2747a5", "lessThan": "beb4e9801f6362436102acc4cc5304b7324f9365", "status": "affected", "versionType": "git" }, { "version": "026d958b38c628a1b4ced534808945365e2747a5", "lessThan": "e70fdb121171c3eb0ac34eb545721828cd737717", "status": "affected", "versionType": "git" }, { "version": "026d958b38c628a1b4ced534808945365e2747a5", "lessThan": "1a3af2262cb384112ef38632de4690682be528b4", "status": "affected", "versionType": "git" }, { "version": "026d958b38c628a1b4ced534808945365e2747a5", "lessThan": "465f511f59a0fa7a80d5d1073c4b24f28ea38f58", "status": "affected", "versionType": "git" }, { "version": "026d958b38c628a1b4ced534808945365e2747a5", "lessThan": "0ca487abb3bdf581851664b5db21f364caf57682", "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/svc_rdma_recvfrom.c" ], "versions": [ { "version": "4.13", "status": "affected" }, { "version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "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": "4.13", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/beb4e9801f6362436102acc4cc5304b7324f9365" }, { "url": "https://git.kernel.org/stable/c/e70fdb121171c3eb0ac34eb545721828cd737717" }, { "url": "https://git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4" }, { "url": "https://git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58" }, { "url": "https://git.kernel.org/stable/c/0ca487abb3bdf581851664b5db21f364caf57682" } ], "title": "svcrdma: Reject Read lists that exceed the page budget", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-89528", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:23:02.453234Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:41.042Z" } } ] } }