CVE-2026-89532

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89532", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.720Z", "datePublished": "2026-09-11T19:44:11.495Z", "dateUpdated": "2026-10-19T08:48:23.895Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:23.895Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Fix pcl_for_each_segment for empty chunks\n\nWhen a parsed chunk list contains a chunk whose ch_segcount is zero,\npcl_for_each_segment computes its inclusive upper bound as\n&chunk->ch_segments[ch_segcount - 1]. ch_segcount is u32, so the\nsubtraction wraps to 0xFFFFFFFF and the bound lands far past the\nch_segments flex array. The loop body then walks unrelated memory at\nsizeof(struct svc_rdma_segment) stride until it faults.\n\nA zero-segcount chunk is reachable from the wire:\nxdr_check_write_chunk() only rejects segcount values greater than\nrc_maxpages, and pcl_alloc_write() links a freshly allocated chunk\nonto rc_write_pcl/rc_reply_pcl before its segment-fill loop runs,\nso a Write or Reply chunk advertising zero segments leaves\nch_segcount == 0 on the list. When the transport has negotiated\nSend-With-Invalidate, svc_rdma_get_inv_rkey() iterates all four\nPCLs with pcl_for_each_segment and dereferences segment->rs_handle\non each iteration, turning the underflow into an out-of-bounds read\nand a general protection fault.\n\n xdr_check_write_list / xdr_check_reply_chunk\n pcl_alloc_write()\n chunk = pcl_alloc_chunk(...) /* ch_segcount = 0 */\n list_add_tail(&chunk->ch_list, &pcl->cl_chunks)\n /* fill loop iterates zero times for wire segcount 0 */\n\n svc_rdma_get_inv_rkey()\n pcl_for_each_chunk(rc_write_pcl)\n pcl_for_each_segment(segment, chunk)\n pos <= &ch_segments[0u - 1u] /* 0xFFFFFFFF */\n segment->rs_handle /* OOB read -> GPF */\n\nFix by switching the macro to a half-open upper bound that uses\nch_segcount directly. For ch_segcount == 0 the loop start equals the\nloop end and the body is skipped; for ch_segcount > 0 the iteration\nrange is unchanged. All six existing call sites in\nnet/sunrpc/xprtrdma/svc_rdma_recvfrom.c and\nnet/sunrpc/xprtrdma/svc_rdma_rw.c remain correct under the new bound,\nso no caller changes are needed."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - svcrdma is the nfsd RPC-over-RDMA server transport and parses Write/Reply chunks from remote peers over iWARP or routable RoCEv2; a remote NFS/RDMA client triggers the bug with a crafted transport header on an established RDMA connection.\nAC:L - The attacker sets RPCRDMA_CMP_F_SND_W_INV_OK on connect and sends a Write or Reply chunk with segcount 0, which xdr_check_write_chunk accepts; Send-With-Invalidate is available on typical RDMA devices, so svc_rdma_get_inv_rkey hits the underflow deterministically.\nPR:N - svc_rdma_xdr_decode_req and svc_rdma_get_inv_rkey run in svc_rdma_recvfrom before svc_process/svc_authenticate; RDMA CM accept and RPC-over-RDMA header parsing require no NFS credentials or capabilities.\nUI:N - Exploitation requires only attacker-generated RDMA connect and RPC-over-RDMA messages to a listening NFS/RDMA service; no victim user action is needed.\nS:U - The out-of-bounds read and resulting general protection fault occur in the host kernel NFS/RDMA server and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - With ch_segcount 0, pcl_for_each_segment underflows the u32 bound to 0xFFFFFFFF and walks adjacent kernel heap at sizeof(struct svc_rdma_segment) stride, an unbounded out-of-bounds read rather than a few-byte leak.\nI:N - svc_rdma_get_inv_rkey only loads segment->rs_handle from the overrun pointer; the defect is a read-only walk with no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - The unbounded walk continues until it hits unmapped memory and raises a general protection fault, oopsing or panicking the kernel, and the attacker can repeat it on each request."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/sunrpc/svc_rdma_pcl.h"], "versions": [{"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "1e2e3481e39103a386b86be1c33eaef97cbdf16e", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "3a78b841879c2a3243f74edc514236fb2907167f", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "06d0390c37fa6714624af771bd72bbf1a7ed9bb1", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "9c5a03c3dc505c0295339b0a1b9e4fe36447e482", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "6d33a7e6bf6c6b293a266a617201285a1ad32c56", "status": "affected", "versionType": "git"}, {"version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "b7713a784c59515d0aba558c8f5df6a0164dd3a9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/sunrpc/svc_rdma_pcl.h"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "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": "5.11", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e"}, {"url": "https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f"}, {"url": "https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1"}, {"url": "https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482"}, {"url": "https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8"}, {"url": "https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56"}, {"url": "https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9"}], "title": "svcrdma: Fix pcl_for_each_segment for empty chunks", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89532", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:11.362883Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:41.408Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89532", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:11.362883Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:23:11.910Z"}}], "cna": {"title": "svcrdma: Fix pcl_for_each_segment for empty chunks", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.1, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - svcrdma is the nfsd RPC-over-RDMA server transport and parses Write/Reply chunks from remote peers over iWARP or routable RoCEv2; a remote NFS/RDMA client triggers the bug with a crafted transport header on an established RDMA connection.\nAC:L - The attacker sets RPCRDMA_CMP_F_SND_W_INV_OK on connect and sends a Write or Reply chunk with segcount 0, which xdr_check_write_chunk accepts; Send-With-Invalidate is available on typical RDMA devices, so svc_rdma_get_inv_rkey hits the underflow deterministically.\nPR:N - svc_rdma_xdr_decode_req and svc_rdma_get_inv_rkey run in svc_rdma_recvfrom before svc_process/svc_authenticate; RDMA CM accept and RPC-over-RDMA header parsing require no NFS credentials or capabilities.\nUI:N - Exploitation requires only attacker-generated RDMA connect and RPC-over-RDMA messages to a listening NFS/RDMA service; no victim user action is needed.\nS:U - The out-of-bounds read and resulting general protection fault occur in the host kernel NFS/RDMA server and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - With ch_segcount 0, pcl_for_each_segment underflows the u32 bound to 0xFFFFFFFF and walks adjacent kernel heap at sizeof(struct svc_rdma_segment) stride, an unbounded out-of-bounds read rather than a few-byte leak.\nI:N - svc_rdma_get_inv_rkey only loads segment->rs_handle from the overrun pointer; the defect is a read-only walk with no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - The unbounded walk continues until it hits unmapped memory and raises a general protection fault, oopsing or panicking the kernel, and the attacker can repeat it on each request."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "1e2e3481e39103a386b86be1c33eaef97cbdf16e", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "3a78b841879c2a3243f74edc514236fb2907167f", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "06d0390c37fa6714624af771bd72bbf1a7ed9bb1", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "9c5a03c3dc505c0295339b0a1b9e4fe36447e482", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "6d33a7e6bf6c6b293a266a617201285a1ad32c56", "versionType": "git"}, {"status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "lessThan": "b7713a784c59515d0aba558c8f5df6a0164dd3a9", "versionType": "git"}], "programFiles": ["include/linux/sunrpc/svc_rdma_pcl.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"status": "unaffected", "version": "0", "lessThan": "5.11", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "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": ["include/linux/sunrpc/svc_rdma_pcl.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e"}, {"url": "https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f"}, {"url": "https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1"}, {"url": "https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482"}, {"url": "https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8"}, {"url": "https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56"}, {"url": "https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Fix pcl_for_each_segment for empty chunks\n\nWhen a parsed chunk list contains a chunk whose ch_segcount is zero,\npcl_for_each_segment computes its inclusive upper bound as\n&chunk->ch_segments[ch_segcount - 1]. ch_segcount is u32, so the\nsubtraction wraps to 0xFFFFFFFF and the bound lands far past the\nch_segments flex array. The loop body then walks unrelated memory at\nsizeof(struct svc_rdma_segment) stride until it faults.\n\nA zero-segcount chunk is reachable from the wire:\nxdr_check_write_chunk() only rejects segcount values greater than\nrc_maxpages, and pcl_alloc_write() links a freshly allocated chunk\nonto rc_write_pcl/rc_reply_pcl before its segment-fill loop runs,\nso a Write or Reply chunk advertising zero segments leaves\nch_segcount == 0 on the list. When the transport has negotiated\nSend-With-Invalidate, svc_rdma_get_inv_rkey() iterates all four\nPCLs with pcl_for_each_segment and dereferences segment->rs_handle\non each iteration, turning the underflow into an out-of-bounds read\nand a general protection fault.\n\n xdr_check_write_list / xdr_check_reply_chunk\n pcl_alloc_write()\n chunk = pcl_alloc_chunk(...) /* ch_segcount = 0 */\n list_add_tail(&chunk->ch_list, &pcl->cl_chunks)\n /* fill loop iterates zero times for wire segcount 0 */\n\n svc_rdma_get_inv_rkey()\n pcl_for_each_chunk(rc_write_pcl)\n pcl_for_each_segment(segment, chunk)\n pos <= &ch_segments[0u - 1u] /* 0xFFFFFFFF */\n segment->rs_handle /* OOB read -> GPF */\n\nFix by switching the macro to a half-open upper bound that uses\nch_segcount directly. For ch_segcount == 0 the loop start equals the\nloop end and the body is skipped; for ch_segcount > 0 the iteration\nrange is unchanged. All six existing call sites in\nnet/sunrpc/xprtrdma/svc_rdma_recvfrom.c and\nnet/sunrpc/xprtrdma/svc_rdma_rw.c remain correct under the new bound,\nso no caller changes are needed."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "5.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:23.895Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89532", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:48:23.895Z", "dateReserved": "2026-09-11T19:38:34.720Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:11.495Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/sunrpc/svc_rdma_pcl.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1e2e3481e39103a386b86be1c33eaef97cbdf16e", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "3a78b841879c2a3243f74edc514236fb2907167f", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "06d0390c37fa6714624af771bd72bbf1a7ed9bb1", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "9c5a03c3dc505c0295339b0a1b9e4fe36447e482", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "6d33a7e6bf6c6b293a266a617201285a1ad32c56", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}, {"lessThan": "b7713a784c59515d0aba558c8f5df6a0164dd3a9", "status": "affected", "version": "78147ca8b4a9b6cf0e597ddd6bf17959e08376c2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/sunrpc/svc_rdma_pcl.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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: Fix pcl_for_each_segment for empty chunks\n\nWhen a parsed chunk list contains a chunk whose ch_segcount is zero,\npcl_for_each_segment computes its inclusive upper bound as\n&chunk->ch_segments[ch_segcount - 1]. ch_segcount is u32, so the\nsubtraction wraps to 0xFFFFFFFF and the bound lands far past the\nch_segments flex array. The loop body then walks unrelated memory at\nsizeof(struct svc_rdma_segment) stride until it faults.\n\nA zero-segcount chunk is reachable from the wire:\nxdr_check_write_chunk() only rejects segcount values greater than\nrc_maxpages, and pcl_alloc_write() links a freshly allocated chunk\nonto rc_write_pcl/rc_reply_pcl before its segment-fill loop runs,\nso a Write or Reply chunk advertising zero segments leaves\nch_segcount == 0 on the list. When the transport has negotiated\nSend-With-Invalidate, svc_rdma_get_inv_rkey() iterates all four\nPCLs with pcl_for_each_segment and dereferences segment->rs_handle\non each iteration, turning the underflow into an out-of-bounds read\nand a general protection fault.\n\n xdr_check_write_list / xdr_check_reply_chunk\n pcl_alloc_write()\n chunk = pcl_alloc_chunk(...) /* ch_segcount = 0 */\n list_add_tail(&chunk->ch_list, &pcl->cl_chunks)\n /* fill loop iterates zero times for wire segcount 0 */\n\n svc_rdma_get_inv_rkey()\n pcl_for_each_chunk(rc_write_pcl)\n pcl_for_each_segment(segment, chunk)\n pos <= &ch_segments[0u - 1u] /* 0xFFFFFFFF */\n segment->rs_handle /* OOB read -> GPF */\n\nFix by switching the macro to a half-open upper bound that uses\nch_segcount directly. For ch_segcount == 0 the loop start equals the\nloop end and the body is skipped; for ch_segcount > 0 the iteration\nrange is unchanged. All six existing call sites in\nnet/sunrpc/xprtrdma/svc_rdma_recvfrom.c and\nnet/sunrpc/xprtrdma/svc_rdma_rw.c remain correct under the new bound,\nso no caller changes are needed."}], "id": "CVE-2026-89532", "lastModified": "2026-10-19T09:17:47.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89532", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:23:11.362883Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:36.117", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: svcrdma out-of-bounds read leads to denial of service", "id": "2532488", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532488"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's svcrdma component. A remote attacker could send a specially crafted network packet that causes an integer underflow in the `pcl_for_each_segment` function when processing a chunk with zero segments. This vulnerability leads to an out-of-bounds read, resulting in a general protection fault and a denial of service."], "name": "CVE-2026-89532", "public_date": "2026-09-11T19:44:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89532\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89532\nhttps://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56\nhttps://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482\nhttps://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8\nhttps://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[78147ca8b4a9b6cf0e597ddd6bf17959e08376c2,9c5a03c3dc505c0295339b0a1b9e4fe36447e482)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[78147ca8b4a9b6cf0e597ddd6bf17959e08376c2,a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[78147ca8b4a9b6cf0e597ddd6bf17959e08376c2,6d33a7e6bf6c6b293a266a617201285a1ad32c56)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[78147ca8b4a9b6cf0e597ddd6bf17959e08376c2,b7713a784c59515d0aba558c8f5df6a0164dd3a9)"}}], "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": "generic", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.11)"}}, {"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": "2026-09-12T10:45:13.072964+00:00", "updated": "2026-09-15T22:15:17.695878+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}