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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "4.14.234",
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              "status": "unaffected",
              "version": "4.19.192",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.4.122",
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            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "4.8",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Clear all QP fields if creation failed\n\nrxe_qp_do_cleanup() relies on valid pointer values in QP for the properly\ncreated ones, but in case rxe_qp_from_init() failed it was filled with\ngarbage and caused tot the following error.\n\n  refcount_t: underflow; use-after-free.\n  WARNING: CPU: 1 PID: 12560 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28\n  Modules linked in:\n  CPU: 1 PID: 12560 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n  RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28\n  Code: e9 db fe ff ff 48 89 df e8 2c c2 ea fd e9 8a fe ff ff e8 72 6a a7 fd 48 c7 c7 e0 b2 c1 89 c6 05 dc 3a e6 09 01 e8 ee 74 fb 04 \u003c0f\u003e 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55\n  RSP: 0018:ffffc900097ceba8 EFLAGS: 00010286\n  RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n  RDX: 0000000000040000 RSI: ffffffff815bb075 RDI: fffff520012f9d67\n  RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000\n  R10: ffffffff815b4eae R11: 0000000000000000 R12: ffff8880322a4800\n  R13: ffff8880322a4940 R14: ffff888033044e00 R15: 0000000000000000\n  FS:  00007f6eb2be3700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007fdbe5d41000 CR3: 000000001d181000 CR4: 00000000001506e0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n   __refcount_sub_and_test include/linux/refcount.h:283 [inline]\n   __refcount_dec_and_test include/linux/refcount.h:315 [inline]\n   refcount_dec_and_test include/linux/refcount.h:333 [inline]\n   kref_put include/linux/kref.h:64 [inline]\n   rxe_qp_do_cleanup+0x96f/0xaf0 drivers/infiniband/sw/rxe/rxe_qp.c:805\n   execute_in_process_context+0x37/0x150 kernel/workqueue.c:3327\n   rxe_elem_release+0x9f/0x180 drivers/infiniband/sw/rxe/rxe_pool.c:391\n   kref_put include/linux/kref.h:65 [inline]\n   rxe_create_qp+0x2cd/0x310 drivers/infiniband/sw/rxe/rxe_verbs.c:425\n   _ib_create_qp drivers/infiniband/core/core_priv.h:331 [inline]\n   ib_create_named_qp+0x2ad/0x1370 drivers/infiniband/core/verbs.c:1231\n   ib_create_qp include/rdma/ib_verbs.h:3644 [inline]\n   create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2920\n   ib_mad_port_open drivers/infiniband/core/mad.c:3001 [inline]\n   ib_mad_init_device+0xd6f/0x1400 drivers/infiniband/core/mad.c:3092\n   add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:717\n   enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331\n   ib_register_device drivers/infiniband/core/device.c:1413 [inline]\n   ib_register_device+0x7c7/0xa50 drivers/infiniband/core/device.c:1365\n   rxe_register_device+0x3d5/0x4a0 drivers/infiniband/sw/rxe/rxe_verbs.c:1147\n   rxe_add+0x12fe/0x16d0 drivers/infiniband/sw/rxe/rxe.c:247\n   rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:503\n   rxe_newlink drivers/infiniband/sw/rxe/rxe.c:269 [inline]\n   rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:250\n   nldev_newlink+0x30e/0x550 drivers/infiniband/core/nldev.c:1555\n   rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195\n   rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]\n   rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259\n   netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]\n   netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338\n   netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927\n   sock_sendmsg_nosec net/socket.c:654 [inline]\n   sock_sendmsg+0xcf/0x120 net/socket.c:674\n   ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350\n   ___sys_sendmsg+0xf3/0x170 net/socket.c:2404\n   __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433\n   do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47\n   entry_SYSCALL_64_after_hwframe+0\n---truncated---"
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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            {
              "lang": "en",
              "value": "AV:L - The bug is in Soft RoCE QP creation failure cleanup, reached via local uverbs create_qp or RDMA netlink nldev_newlink, not via processing remote packets.\nAC:L - An attacker who can create QPs can reliably force rxe_qp_from_init() to fail (e.g., mmap-info allocation or copy_to_user failure on the userspace path) and hit the broken cleanup; no conditions outside attacker control are required.\nPR:L - Once an rxe device exists, /dev/infiniband/uverbs* is mode 0666 with no capability check for ordinary create_qp, so an unprivileged local user can trigger the same failure/cleanup UAF; creating the link itself needs CAP_NET_ADMIN in init_user_ns, but the vulnerable code is reachable without that.\nUI:N - Exploitation requires only attacker-controlled syscalls (uverbs or netlink); no victim action is needed.\nS:U - Impact is confined to the local kernel privilege boundary (standard local UAF/privilege escalation), with no VM escape or cross-authority boundary crossed.\nC:H - Failed QP init drops PD/CQ/SRQ refs then leaves those pointers set so rxe_qp_do_cleanup() drops them again, producing a refcount underflow use-after-free that can yield arbitrary kernel read primitives.\nI:H - The same UAF/double-free of referenced objects and dangling queue pointers enables heap reuse and arbitrary write / control-flow hijacking in the kernel.\nA:H - The bug demonstrably causes refcount underflow warnings and use-after-free during cleanup, which can oops/panic the kernel even without full exploitation."
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:45:51.708Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6a8086a42dfbf548a42bf2ae4faa291645c72c66"
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          "url": "https://git.kernel.org/stable/c/67f29896fdc83298eed5a6576ff8f9873f709228"
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      "title": "RDMA/rxe: Clear all QP fields if creation failed",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47078",
    "datePublished": "2024-03-01T21:15:14.679Z",
    "dateReserved": "2024-02-29T22:33:44.297Z",
    "dateUpdated": "2026-08-05T08:45:51.708Z",
    "state": "PUBLISHED"
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}