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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nionic: fix use after netif_napi_del()\n\nWhen queues are started, netif_napi_add() and napi_enable() are called.\nIf there are 4 queues and only 3 queues are used for the current\nconfiguration, only 3 queues\u0027 napi should be registered and enabled.\nThe ionic_qcq_enable() checks whether the .poll pointer is not NULL for\nenabling only the using queue\u0027 napi. Unused queues\u0027 napi will not be\nregistered by netif_napi_add(), so the .poll pointer indicates NULL.\nBut it couldn\u0027t distinguish whether the napi was unregistered or not\nbecause netif_napi_del() doesn\u0027t reset the .poll pointer to NULL.\nSo, ionic_qcq_enable() calls napi_enable() for the queue, which was\nunregistered by netif_napi_del().\n\nReproducer:\n   ethtool -L \u003cinterface name\u003e rx 1 tx 1 combined 0\n   ethtool -L \u003cinterface name\u003e rx 0 tx 0 combined 1\n   ethtool -L \u003cinterface name\u003e rx 0 tx 0 combined 4\n\nSplat looks like:\nkernel BUG at net/core/dev.c:6666!\nOops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\nCPU: 3 PID: 1057 Comm: kworker/3:3 Not tainted 6.10.0-rc2+ #16\nWorkqueue: events ionic_lif_deferred_work [ionic]\nRIP: 0010:napi_enable+0x3b/0x40\nCode: 48 89 c2 48 83 e2 f6 80 b9 61 09 00 00 00 74 0d 48 83 bf 60 01 00 00 00 74 03 80 ce 01 f0 4f\nRSP: 0018:ffffb6ed83227d48 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: ffff97560cda0828 RCX: 0000000000000029\nRDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff97560cda0a28\nRBP: ffffb6ed83227d50 R08: 0000000000000400 R09: 0000000000000001\nR10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000\nR13: ffff97560ce3c1a0 R14: 0000000000000000 R15: ffff975613ba0a20\nFS:  0000000000000000(0000) GS:ffff975d5f780000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f8f734ee200 CR3: 0000000103e50000 CR4: 00000000007506f0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n ? die+0x33/0x90\n ? do_trap+0xd9/0x100\n ? napi_enable+0x3b/0x40\n ? do_error_trap+0x83/0xb0\n ? napi_enable+0x3b/0x40\n ? napi_enable+0x3b/0x40\n ? exc_invalid_op+0x4e/0x70\n ? napi_enable+0x3b/0x40\n ? asm_exc_invalid_op+0x16/0x20\n ? napi_enable+0x3b/0x40\n ionic_qcq_enable+0xb7/0x180 [ionic 59bdfc8a035436e1c4224ff7d10789e3f14643f8]\n ionic_start_queues+0xc4/0x290 [ionic 59bdfc8a035436e1c4224ff7d10789e3f14643f8]\n ionic_link_status_check+0x11c/0x170 [ionic 59bdfc8a035436e1c4224ff7d10789e3f14643f8]\n ionic_lif_deferred_work+0x129/0x280 [ionic 59bdfc8a035436e1c4224ff7d10789e3f14643f8]\n process_one_work+0x145/0x360\n worker_thread+0x2bb/0x3d0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xcc/0x100\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2d/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30"
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              "value": "AV:L - The trigger is a local `ethtool -L` operation on the netdev, delivered via the ethtool ioctl or the ethtool generic-netlink family \u2014 no network packet from a remote peer reaches the vulnerable code. Attack requires local access to the system or container hosting the ionic netdev.\nAC:L - The upstream reproducer is a deterministic three-command sequence (`ethtool -L ... rx 1 tx 1 combined 0`, then `combined 1`, then `combined 4`) with no race and no dependence on memory layout or system state the attacker cannot influence. The link-status event that drives the crashing deferred work is generated by the reconfiguration itself via `ionic_link_status_check_request()`.\nPR:L - Both entry points gate on namespace-relative CAP_NET_ADMIN (`ns_capable(net-\u003euser_ns, CAP_NET_ADMIN)` in net/ethtool/ioctl.c:2912 and `GENL_UNS_ADMIN_PERM` in net/ethtool/netlink.c:921), which an unprivileged user holds inside their own user namespace. ionic exposes SR-IOV VFs that are routinely delegated into container network namespaces by SR-IOV CNI, so a basic container user reaches `ionic_set_channels` without any host-root privilege.\nUI:N - The entire sequence is attacker-driven from a single process; no administrator or victim action is needed. The queue restart that reaches `ionic_qcq_enable()` is triggered automatically by the attacker\u0027s own reconfiguration.\nS:U - The corruption and the crash are confined to the kernel\u0027s own security authority \u2014 there is no hypervisor, IOMMU, or DMA boundary being crossed. This is standard in-kernel memory corruption, so the vulnerable component and impacted component share one authority.\nC:H - Re-enabling a NAPI that `netif_napi_del()` already unlinked leaves it schedulable from the still-registered IRQ while the containing `struct ionic_qcq` is `devm_kfree()`d, so `net_rx_action()` polls freed slab memory \u2014 a use-after-free that yields an arbitrary kernel-memory read primitive once the object is resprayed.\nI:H - The same use-after-free makes `n-\u003epoll` an indirect call through freed, attacker-sprayable slab memory, giving a control-flow-hijack and arbitrary-write primitive. Per UAF scoring guidance this is High integrity impact, not a mere crash.\nA:H - `napi_enable()` hits `BUG_ON(!test_bit(NAPI_STATE_SCHED, \u0026val))` (net/core/dev.c:6665) and kills the kworker while it holds `lif-\u003equeue_lock`, which is then leaked permanently \u2014 every subsequent `ionic_open`/`ionic_stop`/ethtool path blocks on it while holding `rtnl_lock`, deadlocking the whole networking control plane until reboot (immediate panic with `panic_on_oops=1`)."
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/udp_media.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.1"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "4.19.320",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.4.282",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.224",
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            },
            {
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              "status": "unaffected",
              "version": "5.15.165",
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            },
            {
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              "status": "unaffected",
              "version": "6.1.103",
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            },
            {
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              "status": "unaffected",
              "version": "6.6.44",
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            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionEndExcluding": "4.19.320",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.282",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "5.10.224",
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                  "vulnerable": true
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.103",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.44",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.11",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Return non-zero value from tipc_udp_addr2str() on error\n\ntipc_udp_addr2str() should return non-zero value if the UDP media\naddress is invalid. Otherwise, a buffer overflow access can occur in\ntipc_media_addr_printf(). Fix this by returning 1 on an invalid UDP\nmedia address."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The malformed media address is parsed straight out of a TIPC LINK_CONFIG discovery packet received on the UDP bearer socket (port 6118), which accepts routable unicast/replicast traffic from arbitrary sources with no peer-address check in tipc_udp_recv(). A remote host can therefore reach the vulnerable code with a single crafted UDP datagram.\nAC:L - One crafted packet with proto set to any value other than ETH_P_IP/ETH_P_IPV6 and msg_prevnode=0 deterministically reaches disc_dupl_alert() and the uninitialized-buffer read; there is no race, no memory-layout dependency, and no condition outside the attacker\u0027s control.\nPR:N - TIPC neighbor discovery is processed before any link is established and, with the default configuration (no CONFIG_TIPC_CRYPTO keys), involves no authentication whatsoever. The attacker needs no account or credentials on the target.\nUI:N - The victim node processes incoming discovery messages automatically in softirq context; no administrator or user action is required beyond having the UDP bearer already enabled.\nS:U - The out-of-bounds read and the leaked data both stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The %s conversion reads an uninitialized 60-byte stack buffer past its end until a NUL byte, and the harvested kernel stack contents are printed into the kernel log via pr_warn \u2014 an unbounded stack out-of-bounds read that can disclose kernel pointers and defeat KASLR.\nI:N - No out-of-bounds or attacker-controlled write occurs; every scnprintf() destination remains correctly length-bounded, so no kernel data is modified.\nA:H - The unbounded stack read can fault into the VMAP_STACK guard page and immediately panics KASAN/panic_on_warn kernels as a stack-out-of-bounds report, and the trigger is a non-ratelimited pr_warn that a remote attacker can drive repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:36:20.207Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7ec3335dd89c8d169e9650e4bac64fde71fdf15b"
        },
        {
          "url": "https://git.kernel.org/stable/c/253405541be2f15ffebdeac2f4cf4b7e9144d12f"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa38bf74899de07cf70b50cd17f8ad45fb6654c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5eea127675450583680c8170358bcba43227bd69"
        },
        {
          "url": "https://git.kernel.org/stable/c/728734352743a78b4c5a7285b282127696a4a813"
        },
        {
          "url": "https://git.kernel.org/stable/c/76ddf84a52f0d8ec3f5db6ccce08faf202a17d28"
        },
        {
          "url": "https://git.kernel.org/stable/c/2abe350db1aa599eeebc6892237d0bce0f1de62a"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa96c6baef1b5385e2f0c0677b32b3839e716076"
        }
      ],
      "title": "tipc: Return non-zero value from tipc_udp_addr2str() on error",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42284",
    "datePublished": "2024-08-17T09:08:50.576Z",
    "dateReserved": "2024-07-30T07:40:12.262Z",
    "dateUpdated": "2026-08-05T11:36:20.207Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}