{
  "cveId": "CVE-2026-52939",
  "url": "https://patchblox.com/security/cve/CVE-2026-52939",
  "summary": "CVE-2026-52939 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-52939, released June 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/rds: fix NULL deref in rds_ib_send_cqe_handl...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion  rds_ib_xmit_atomic() always programs a masked atomic opcode (IB_WR_MASKED_ATOMIC_CMP_AND_SWP or IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) for every RDS atomic cmsg.  But the completion-side switch in rds_ib_send_unmap_op() only handles the non-masked opcodes, so a masked atomic completion falls through to default and returns rm == NULL while send-\u003Es_op is left set.  rds_ib_send_cqe_handler() then dereferences the NULL rm via rm-\u003Em_final_op, oopsing in softirq context.  An unprivileged AF_RDS sendmsg() of an atomic cmsg over an active RDS/IB connection triggers it; on hardware that natively accepts masked atomics (mlx4, mlx5) no extra setup is needed.    RDS/IB: rds_ib_send_unmap_op: unexpected opcode 0xd in WR!   Oops: general protection fault [#1] SMP KASAN   KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]   RIP: rds_ib_send_cqe_handler\u002B0x25c/0xb10 (net/rds/ib_send.c:282)   Call Trace:    \u003CIRQ\u003E    rds_ib_send_cqe_handler (net/rds/ib_send.c:282)    poll_scq (net/rds/ib_cm.c:274)    rds_ib_tasklet_fn_send (net/rds/ib_cm.c:294)    tasklet_action_common (kernel/softirq.c:943)    handle_softirqs (kernel/softirq.c:573)    run_ksoftirqd (kernel/softirq.c:479)    \u003C/IRQ\u003E   Kernel panic - not syncing: Fatal exception in interrupt  Handle the masked atomic opcodes in the same case as the non-masked ones: they map to the same struct rds_message.atomic union member, so the existing container_of()/rds_ib_send_unmap_atomic() body is correct for them.",
  "published": "2026-06-24T08:16:24Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00117,
  "epssPercentile": 0.01649,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.81.1",
      "fix": "SUSE-SU-2026:4254-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4254-1",
      "released": "2026-10-07T22:31:36Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "SUSE-SU-2026:23902-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23902-1",
      "released": "2026-09-22T14:23:31Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.81.1",
      "fix": "SUSE-SU-2026:4254-1",
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      "released": "2026-10-07T22:31:36Z"
    },
    {
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      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "SUSE-SU-2026:23902-1",
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      "released": "2026-09-22T14:23:31Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default",
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      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
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      "fixedVersion": "6.4.0-150700.53.81.1",
      "fix": "SUSE-SU-2026:4254-1",
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      "released": "2026-10-07T22:31:36Z"
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
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      "fixedVersion": "6.4.0-150700.53.81.1.150700.17.45.1",
      "fix": "SUSE-SU-2026:4254-1",
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      "released": "2026-10-07T22:31:36Z"
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      "fixedVersion": "6.12.0-160000.38.1.160000.2.23",
      "fix": "SUSE-SU-2026:23902-1",
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      "released": "2026-09-22T14:23:31Z"
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    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.81.1",
      "fix": "SUSE-SU-2026:4254-1",
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      "released": "2026-10-07T22:31:36Z"
    },
    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "sles 16.0",
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      "fix": "SUSE-SU-2026:23902-1",
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    {
      "platform": "linux",
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      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T14:23:31Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-SLE15-SP7-RT_Update_20",
      "release": "sles 15.7",
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      "fix": "SUSE-SU-2026:4120-1",
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      "released": "2026-09-10T09:31:34Z"
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      "product": "kernel-livepatch-SLE15-SP7_Update_21",
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      "fix": "SUSE-SU-2026:4254-1",
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      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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    {
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}