{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52995", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.377Z", "datePublished": "2026-06-24T16:29:08.229Z", "dateUpdated": "2026-06-24T16:29:08.229Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:29:08.229Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: zero per-item info buffer before handing it to visitors\n\nrds_for_each_conn_info() and rds_walk_conn_path_info() both hand a\ncaller-allocated on-stack u64 buffer to a per-connection visitor and\nthen copy the full item_len bytes back to user space via\nrds_info_copy() regardless of how much of the buffer the visitor\nactually wrote.\n\nrds_ib_conn_info_visitor() and rds6_ib_conn_info_visitor() only\nwrite a subset of their output struct when the underlying\nrds_connection is not in state RDS_CONN_UP (src/dst addr, tos, sl\nand the two GIDs via explicit memsets). Several u32 fields\n(max_send_wr, max_recv_wr, max_send_sge, rdma_mr_max, rdma_mr_size,\ncache_allocs) and the 2-byte alignment hole between sl and\ncache_allocs remain as whatever stack contents preceded the visitor\ncall and are then memcpy_to_user()'d out to user space.\n\nstruct rds_info_rdma_connection and struct rds6_info_rdma_connection\nare the only rds_info_* structs in include/uapi/linux/rds.h that are\nnot marked __attribute__((packed)), so they have a real alignment\nhole. The other info visitors (rds_conn_info_visitor,\nrds6_conn_info_visitor, rds_tcp_tc_info, ...) write all fields of\ntheir packed output struct today and are not known to be vulnerable,\nbut a future visitor that adds a conditional write-path would have\nthe same bug.\n\nReproduction on a kernel built without CONFIG_INIT_STACK_ALL_ZERO=y:\na local unprivileged user opens AF_RDS, sets SO_RDS_TRANSPORT=IB,\nbinds to a local address on an RDMA-capable netdev (rxe soft-RoCE on\nany netdev is sufficient), sendto()'s any peer on the same subnet\n(fails cleanly but installs an rds_connection in the global hash in\nRDS_CONN_CONNECTING), then calls getsockopt(SOL_RDS,\nRDS_INFO_IB_CONNECTIONS). The returned 68-byte item contains 26\nbytes of stack garbage including kernel text/data pointers:\n\n 0..7 0a 63 00 01 0a 63 00 02 src=10.99.0.1 dst=10.99.0.2\n 8..39 00 ... gids (memset-zeroed)\n 40..47 e0 92 a3 81 ff ff ff ff kernel pointer (max_send_wr)\n 48..55 7f 37 b5 81 ff ff ff ff kernel pointer (rdma_mr_max)\n 56..59 01 00 08 00 rdma_mr_size (garbage)\n 60..61 00 00 tos, sl\n 62..63 00 00 alignment padding\n 64..67 18 00 00 00 cache_allocs (garbage)\n\nFix by zeroing the per-item buffer in both rds_for_each_conn_info()\nand rds_walk_conn_path_info() before invoking the visitor. This\ncovers the IPv4/IPv6 IB visitors and hardens all current and future\nvisitors against the same class of bug.\n\nNo functional change for visitors that fully populate their output.\n\nChanges in v2:\n- retarget at the net tree (subject prefix \"[PATCH net v2]\",\n net/rds: prefix in the title)\n- pick up Reviewed-by tags from Sharath Srinivasan and\n Allison Henderson" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rds/connection.c" ], "versions": [ { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "81651e9d7dea1c048d2952f57632a042931d7b43", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "0797b2e6901827694aa9c34c4c72118c8c97fba1", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "5e67cc262afb384e835c3327e9d954eeaedc6a87", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "b6ba93a7b71ed443c9843eb12d27ed86f1e52694", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "c7cb9eed8215a790f052f49cdccf577720d2bb62", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "91ce1bb6e4194dc2321748f68145359dcf86e350", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "912ba2e5704fdb8bc5decda96dfc1a57838f0099", "status": "affected", "versionType": "git" }, { "version": "ec16227e14141e4fd7ae76354c09dadfe2449d9e", "lessThan": "c88eb7e8d8397a8c1db59c425332c5a30b2a1682", "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/rds/connection.c" ], "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "2.6.30", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/81651e9d7dea1c048d2952f57632a042931d7b43" }, { "url": "https://git.kernel.org/stable/c/0797b2e6901827694aa9c34c4c72118c8c97fba1" }, { "url": "https://git.kernel.org/stable/c/5e67cc262afb384e835c3327e9d954eeaedc6a87" }, { "url": "https://git.kernel.org/stable/c/b6ba93a7b71ed443c9843eb12d27ed86f1e52694" }, { "url": "https://git.kernel.org/stable/c/c7cb9eed8215a790f052f49cdccf577720d2bb62" }, { "url": "https://git.kernel.org/stable/c/91ce1bb6e4194dc2321748f68145359dcf86e350" }, { "url": "https://git.kernel.org/stable/c/912ba2e5704fdb8bc5decda96dfc1a57838f0099" }, { "url": "https://git.kernel.org/stable/c/c88eb7e8d8397a8c1db59c425332c5a30b2a1682" } ], "title": "net/rds: zero per-item info buffer before handing it to visitors", "x_generator": { "engine": "bippy-1.2.0" } } } }