CVE-2026-89530

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89530", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.719Z", "datePublished": "2026-09-11T19:44:10.024Z", "dateUpdated": "2026-10-30T12:32:01.396Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:01.396Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - svcrdma is nfsd's RPC-over-RDMA server transport; a remote NFS/RDMA client reaches svc_rdma_sendto over InfiniBand, RoCE, or iWARP, including IP-routable RoCEv2/iWARP and Soft-RoCE, so this is a network attack.\nAC:L - The attacker fully controls omitting the Write list and Reply chunk and the NFS READ size; with the default 4096-byte pull-up buffer and ~5 Send SGEs, a multi-page inline READ deterministically takes the SGE-exhaustion pull-up path and overflows, with no race or uncontrollable layout.\nPR:N - RDMA-CM accept has no credential check, and AUTH_NULL/AUTH_UNIX need no real account; default NFS exports accept those flavors, so a fabric peer can drive a large READ reply without local or init-namespace privileges.\nUI:N - Exploitation requires only attacker-sent RPC-over-RDMA Calls that elicit a large inline reply; no victim mount, click, or other user action is needed beyond nfsd already listening on RDMA.\nS:U - The kmalloc overflow and oversized RDMA Send stay inside the host kernel's security authority; this is not a VM, IOMMU, or sandbox escape.\nC:H - svc_rdma_xb_linearize() copies past kmalloc sc_xprt_buf, then the inflated sc_sges[0].length is posted with the PD local DMA lkey, so the device reads adjacent kernel memory onto the wire; the heap smash is also leveragable for disclosure.\nI:H - The unbounded memcpy is a heap out-of-bounds write of attacker-influenced NFS READ payload into adjacent slab objects, enabling corruption of neighboring kernel state and control-flow hijacking.\nA:H - Overflowing a 4KB send buffer by up to the NFS/RDMA max payload smashes adjacent slab and can oops or panic, and posting an SGE longer than the DMA mapping can also fault the device or kernel."}]}], "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_sendto.c"], "versions": [{"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "b73011049dbe909f73fd9620d94ef1757d7af2eb", "status": "affected", "versionType": "git"}, {"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "8068358f445a11296328ffa7c524701596814a17", "status": "affected", "versionType": "git"}, {"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "fcd91b9957462d398792201c239dffaeff1cc8b2", "status": "affected", "versionType": "git"}, {"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "1949dd1576f7a8aa161b1330c6125df9d53046d5", "status": "affected", "versionType": "git"}, {"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf", "status": "affected", "versionType": "git"}, {"version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "0fbe20dfe74b783d255bf389a6ea77aa25dc7860", "status": "affected", "versionType": "git"}, {"version": "9b65b18f817d9ada2bf67351f24bdcce6789a0bb", "status": "affected", "versionType": "git"}, {"version": "d564356e1919d1178568c19af410cfc1a9076663", "status": "affected", "versionType": "git"}, {"version": "4.19.22", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "4.20.9", "lessThan": "4.21", "status": "affected", "versionType": "semver"}]}, {"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_sendto.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "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": "5.0", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b73011049dbe909f73fd9620d94ef1757d7af2eb"}, {"url": "https://git.kernel.org/stable/c/8068358f445a11296328ffa7c524701596814a17"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89530", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:07.762867Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:41.231Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89530", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:07.762867Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:23:08.699Z"}}], "cna": {"title": "svcrdma: Reject inline replies that overflow the pull-up buffer", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - svcrdma is nfsd's RPC-over-RDMA server transport; a remote NFS/RDMA client reaches svc_rdma_sendto over InfiniBand, RoCE, or iWARP, including IP-routable RoCEv2/iWARP and Soft-RoCE, so this is a network attack.\nAC:L - The attacker fully controls omitting the Write list and Reply chunk and the NFS READ size; with the default 4096-byte pull-up buffer and ~5 Send SGEs, a multi-page inline READ deterministically takes the SGE-exhaustion pull-up path and overflows, with no race or uncontrollable layout.\nPR:N - RDMA-CM accept has no credential check, and AUTH_NULL/AUTH_UNIX need no real account; default NFS exports accept those flavors, so a fabric peer can drive a large READ reply without local or init-namespace privileges.\nUI:N - Exploitation requires only attacker-sent RPC-over-RDMA Calls that elicit a large inline reply; no victim mount, click, or other user action is needed beyond nfsd already listening on RDMA.\nS:U - The kmalloc overflow and oversized RDMA Send stay inside the host kernel's security authority; this is not a VM, IOMMU, or sandbox escape.\nC:H - svc_rdma_xb_linearize() copies past kmalloc sc_xprt_buf, then the inflated sc_sges[0].length is posted with the PD local DMA lkey, so the device reads adjacent kernel memory onto the wire; the heap smash is also leveragable for disclosure.\nI:H - The unbounded memcpy is a heap out-of-bounds write of attacker-influenced NFS READ payload into adjacent slab objects, enabling corruption of neighboring kernel state and control-flow hijacking.\nA:H - Overflowing a 4KB send buffer by up to the NFS/RDMA max payload smashes adjacent slab and can oops or panic, and posting an SGE longer than the DMA mapping can also fault the device or kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "b73011049dbe909f73fd9620d94ef1757d7af2eb", "versionType": "git"}, {"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "8068358f445a11296328ffa7c524701596814a17", "versionType": "git"}, {"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "fcd91b9957462d398792201c239dffaeff1cc8b2", "versionType": "git"}, {"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "1949dd1576f7a8aa161b1330c6125df9d53046d5", "versionType": "git"}, {"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf", "versionType": "git"}, {"status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "lessThan": "0fbe20dfe74b783d255bf389a6ea77aa25dc7860", "versionType": "git"}, {"status": "affected", "version": "9b65b18f817d9ada2bf67351f24bdcce6789a0bb", "versionType": "git"}, {"status": "affected", "version": "d564356e1919d1178568c19af410cfc1a9076663", "versionType": "git"}, {"status": "affected", "version": "4.19.22", "lessThan": "4.20", "versionType": "semver"}, {"status": "affected", "version": "4.20.9", "lessThan": "4.21", "versionType": "semver"}], "programFiles": ["net/sunrpc/xprtrdma/svc_rdma_sendto.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"status": "unaffected", "version": "0", "lessThan": "5.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/xprtrdma/svc_rdma_sendto.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/b73011049dbe909f73fd9620d94ef1757d7af2eb"}, {"url": "https://git.kernel.org/stable/c/8068358f445a11296328ffa7c524701596814a17"}, {"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.19.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.20.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:01.396Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89530", "state": "PUBLISHED", "dateUpdated": "2026-10-30T12:32:01.396Z", "dateReserved": "2026-09-11T19:38:34.719Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:10.024Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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": "b73011049dbe909f73fd9620d94ef1757d7af2eb", "status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "versionType": "git"}, {"lessThan": "8068358f445a11296328ffa7c524701596814a17", "status": "affected", "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf", "versionType": "git"}, {"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": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89530", "lastModified": "2026-10-30T13:20:18.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89530", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:23:07.762867Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:35.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8068358f445a11296328ffa7c524701596814a17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b73011049dbe909f73fd9620d94ef1757d7af2eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Memory corruption in svcrdma due to oversized network replies", "id": "2532218", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532218"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's svcrdma component, which handles network communication using Remote Direct Memory Access (RDMA). A remote attacker can send a specially crafted network reply that is larger than expected. This can cause the system to write data beyond the intended memory area, leading to memory corruption. This vulnerability could allow an attacker to cause a denial of service or potentially execute arbitrary code."], "name": "CVE-2026-89530", "public_date": "2026-09-11T19:44:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89530\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89530\nhttps://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860\nhttps://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5\nhttps://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf\nhttps://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e248aa7be86e8179f20ac0931774ecd746f3f5bf,fcd91b9957462d398792201c239dffaeff1cc8b2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e248aa7be86e8179f20ac0931774ecd746f3f5bf,1949dd1576f7a8aa161b1330c6125df9d53046d5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e248aa7be86e8179f20ac0931774ecd746f3f5bf,8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e248aa7be86e8179f20ac0931774ecd746f3f5bf,0fbe20dfe74b783d255bf389a6ea77aa25dc7860)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "9b65b18f817d9ada2bf67351f24bdcce6789a0bb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d564356e1919d1178568c19af410cfc1a9076663"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.19.22,4.20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.20.9,4.21)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T16:30:13.324792+00:00", "updated": "2026-09-15T22:15:17.696434+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}