{"id":"CVE-2026-53133","state":"PUBLISHED","title":"RDMA/umem: Fix truncation for block sizes >= 4G","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Fix truncation for block sizes >= 4G\n\nWhen the iommu is used the linearization of the mapping can give a single\nblock that is very large split across multiple SG entries.\n\nWhen __rdma_block_iter_next() reassembles the split SG entries it is\noverflowing the 32 bit stack values and computed the wrong DMA addresses\nfor blocks after the truncation.\n\nUse the right types to hold DMA addresses.","publishedAt":"2026-06-25T08:38:22.469Z","updatedAt":"2026-10-19T19:57:25.374Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"2ff4b7817e5b78070c30f5fb5e678e452a2628b3","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"dee2a49adeeb2a5e16a3fc858fa21b841c519802","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"8fe0231adebe086c8a459c790944ac026cd99c6e","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"baf8685bcf56dc1efb44b8f6a57c42516e549068","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"afd35fec9297195b759078745549c2671223f24f","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"ac1aad8e1281534ce936c250f68084fc79c5469e","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"15fe76e23615f502d051ef0768f86babaf08746c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/iter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/iter.c"]}],"references":["https://git.kernel.org/stable/c/2ff4b7817e5b78070c30f5fb5e678e452a2628b3","https://git.kernel.org/stable/c/dee2a49adeeb2a5e16a3fc858fa21b841c519802","https://git.kernel.org/stable/c/cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f","https://git.kernel.org/stable/c/8fe0231adebe086c8a459c790944ac026cd99c6e","https://git.kernel.org/stable/c/baf8685bcf56dc1efb44b8f6a57c42516e549068","https://git.kernel.org/stable/c/afd35fec9297195b759078745549c2671223f24f","https://git.kernel.org/stable/c/ac1aad8e1281534ce936c250f68084fc79c5469e","https://git.kernel.org/stable/c/15fe76e23615f502d051ef0768f86babaf08746c"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53133.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53133","state":"PUBLISHED","datePublished":"2026-06-25T08:38:22.469Z","dateUpdated":"2026-10-19T19:57:25.374Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.386Z"},"containers":{"cna":{"title":"RDMA/umem: Fix truncation for block sizes >= 4G","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Fix truncation for block sizes >= 4G\n\nWhen the iommu is used the linearization of the mapping can give a single\nblock that is very large split across multiple SG entries.\n\nWhen __rdma_block_iter_next() reassembles the split SG entries it is\noverflowing the 32 bit stack values and computed the wrong DMA addresses\nfor blocks after the truncation.\n\nUse the right types to hold DMA addresses."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"2ff4b7817e5b78070c30f5fb5e678e452a2628b3","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"dee2a49adeeb2a5e16a3fc858fa21b841c519802","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"8fe0231adebe086c8a459c790944ac026cd99c6e","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"baf8685bcf56dc1efb44b8f6a57c42516e549068","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"afd35fec9297195b759078745549c2671223f24f","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"ac1aad8e1281534ce936c250f68084fc79c5469e","versionType":"git"},{"version":"a808273a495c657e33281b181fd7fcc2bb28f662","status":"affected","lessThan":"15fe76e23615f502d051ef0768f86babaf08746c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/iter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/iter.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2ff4b7817e5b78070c30f5fb5e678e452a2628b3"},{"url":"https://git.kernel.org/stable/c/dee2a49adeeb2a5e16a3fc858fa21b841c519802"},{"url":"https://git.kernel.org/stable/c/cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f"},{"url":"https://git.kernel.org/stable/c/8fe0231adebe086c8a459c790944ac026cd99c6e"},{"url":"https://git.kernel.org/stable/c/baf8685bcf56dc1efb44b8f6a57c42516e549068"},{"url":"https://git.kernel.org/stable/c/afd35fec9297195b759078745549c2671223f24f"},{"url":"https://git.kernel.org/stable/c/ac1aad8e1281534ce936c250f68084fc79c5469e"},{"url":"https://git.kernel.org/stable/c/15fe76e23615f502d051ef0768f86babaf08746c"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Vulnerable code is reached through local RDMA uverbs operations such as opening `/dev/infiniband/uverbsX` and issuing memory-registration commands. Remote RDMA traffic may later exercise a bad MR, but the vulnerable iterator is invoked by local userspace registration, not by network packet parsing.\nAC:L - There is no race or probabilistic condition; on an affected RDMA/IOMMU deployment the attacker controls the MR address, length, and access flags needed to request large aligned mappings. Hardware/IOMMU support is an environmental prerequisite for the affected subsystem, not an exploitation step beyond attacker control.\nPR:L - The uverbs device node is created world-accessible and MR registration does not require CAP_SYS_ADMIN or CAP_NET_ADMIN, though the process must be an unprivileged local user able to use the RDMA device and pin memory under its memlock limits. No real init-namespace root privilege is required.\nUI:N - After local access to the RDMA device, the attacker can perform the open/context/PD/MR registration sequence directly. No separate victim action is required.\nS:U - The impact remains within the kernel/RDMA device memory-management security authority. This is not a guest-to-host escape, IOMMU boundary bypass by a guest, or another cross-scope boundary change.\nC:H - The truncation can program wrong DMA addresses into RDMA memory translation tables for blocks after the overflow. With RDMA read-capable access, the resulting mistranslation can expose unintended memory reachable through the device mapping, so the higher defensible confidentiality impact is High.\nI:H - The same wrong DMA translation can be used with local or remote write-capable MR permissions to direct RDMA writes to unintended mapped memory. Because this is device DMA memory corruption rather than a bounded metadata error, the higher defensible integrity impact is High.\nA:H - Incorrect DMA translations can cause IOMMU/device faults, corrupted RDMA state, or repeated failures of registered memory operations. Given the kernel/device-level DMA fault surface and the requirement to choose the higher severity when uncertain, availability impact is High."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:33:27.415Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-53133","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:25:53.072186Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","type":"CWE","description":"CWE-190 Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:57:25.374Z"}}]}}}