CVE-2026-52995 (GCVE-0-2026-52995)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
net/rds: zero per-item info buffer before handing it to visitors
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: zero per-item info buffer before handing it to visitors rds_for_each_conn_info() and rds_walk_conn_path_info() both hand a caller-allocated on-stack u64 buffer to a per-connection visitor and then copy the full item_len bytes back to user space via rds_info_copy() regardless of how much of the buffer the visitor actually wrote. rds_ib_conn_info_visitor() and rds6_ib_conn_info_visitor() only write a subset of their output struct when the underlying rds_connection is not in state RDS_CONN_UP (src/dst addr, tos, sl and the two GIDs via explicit memsets). Several u32 fields (max_send_wr, max_recv_wr, max_send_sge, rdma_mr_max, rdma_mr_size, cache_allocs) and the 2-byte alignment hole between sl and cache_allocs remain as whatever stack contents preceded the visitor call and are then memcpy_to_user()'d out to user space. struct rds_info_rdma_connection and struct rds6_info_rdma_connection are the only rds_info_* structs in include/uapi/linux/rds.h that are not marked __attribute__((packed)), so they have a real alignment hole. The other info visitors (rds_conn_info_visitor, rds6_conn_info_visitor, rds_tcp_tc_info, ...) write all fields of their packed output struct today and are not known to be vulnerable, but a future visitor that adds a conditional write-path would have the same bug. Reproduction on a kernel built without CONFIG_INIT_STACK_ALL_ZERO=y: a local unprivileged user opens AF_RDS, sets SO_RDS_TRANSPORT=IB, binds to a local address on an RDMA-capable netdev (rxe soft-RoCE on any netdev is sufficient), sendto()'s any peer on the same subnet (fails cleanly but installs an rds_connection in the global hash in RDS_CONN_CONNECTING), then calls getsockopt(SOL_RDS, RDS_INFO_IB_CONNECTIONS). The returned 68-byte item contains 26 bytes of stack garbage including kernel text/data pointers: 0..7 0a 63 00 01 0a 63 00 02 src=10.99.0.1 dst=10.99.0.2 8..39 00 ... gids (memset-zeroed) 40..47 e0 92 a3 81 ff ff ff ff kernel pointer (max_send_wr) 48..55 7f 37 b5 81 ff ff ff ff kernel pointer (rdma_mr_max) 56..59 01 00 08 00 rdma_mr_size (garbage) 60..61 00 00 tos, sl 62..63 00 00 alignment padding 64..67 18 00 00 00 cache_allocs (garbage) Fix by zeroing the per-item buffer in both rds_for_each_conn_info() and rds_walk_conn_path_info() before invoking the visitor. This covers the IPv4/IPv6 IB visitors and hardens all current and future visitors against the same class of bug. No functional change for visitors that fully populate their output. Changes in v2: - retarget at the net tree (subject prefix "[PATCH net v2]", net/rds: prefix in the title) - pick up Reviewed-by tags from Sharath Srinivasan and Allison Henderson
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < 81651e9d7dea1c048d2952f57632a042931d7b43 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < 0797b2e6901827694aa9c34c4c72118c8c97fba1 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < 5e67cc262afb384e835c3327e9d954eeaedc6a87 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < b6ba93a7b71ed443c9843eb12d27ed86f1e52694 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < c7cb9eed8215a790f052f49cdccf577720d2bb62 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < 91ce1bb6e4194dc2321748f68145359dcf86e350 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < 912ba2e5704fdb8bc5decda96dfc1a57838f0099 (git)
Affected: ec16227e14141e4fd7ae76354c09dadfe2449d9e , < c88eb7e8d8397a8c1db59c425332c5a30b2a1682 (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
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          "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()\u0027d 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()\u0027s 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:08.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/81651e9d7dea1c048d2952f57632a042931d7b43"
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          "url": "https://git.kernel.org/stable/c/0797b2e6901827694aa9c34c4c72118c8c97fba1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c88eb7e8d8397a8c1db59c425332c5a30b2a1682"
        }
      ],
      "title": "net/rds: zero per-item info buffer before handing it to visitors",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52995",
    "datePublished": "2026-06-24T16:29:08.229Z",
    "dateReserved": "2026-06-09T07:44:35.377Z",
    "dateUpdated": "2026-06-24T16:29:08.229Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-52995",
      "date": "2026-07-02",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52995\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:10.423\",\"lastModified\":\"2026-06-24T17:17:10.423\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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()\u0027d 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()\u0027s 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/rds/connection.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"81651e9d7dea1c048d2952f57632a042931d7b43\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"0797b2e6901827694aa9c34c4c72118c8c97fba1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"5e67cc262afb384e835c3327e9d954eeaedc6a87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"b6ba93a7b71ed443c9843eb12d27ed86f1e52694\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"c7cb9eed8215a790f052f49cdccf577720d2bb62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"91ce1bb6e4194dc2321748f68145359dcf86e350\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"912ba2e5704fdb8bc5decda96dfc1a57838f0099\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec16227e14141e4fd7ae76354c09dadfe2449d9e\",\"lessThan\":\"c88eb7e8d8397a8c1db59c425332c5a30b2a1682\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/rds/connection.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0797b2e6901827694aa9c34c4c72118c8c97fba1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e67cc262afb384e835c3327e9d954eeaedc6a87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81651e9d7dea1c048d2952f57632a042931d7b43\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/912ba2e5704fdb8bc5decda96dfc1a57838f0099\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91ce1bb6e4194dc2321748f68145359dcf86e350\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6ba93a7b71ed443c9843eb12d27ed86f1e52694\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7cb9eed8215a790f052f49cdccf577720d2bb62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c88eb7e8d8397a8c1db59c425332c5a30b2a1682\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.