CVE-2026-98489 (GCVE-0-2026-98489)
Vulnerability from cvelistv5
Published
2026-10-18 15:16
Modified
2026-10-19 09:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: atl1c: fix soft lockup on out-of-range tpd_cons read The hardware can report an out-of-range tpd_cons (seen as 0xffff) while the PCIe link/MAC is resetting. An out-of-range value can never be reached and the loop below would spin forever. To avoid a soft lockup treat it as "nothing new to clean" instead. Reproduced on two machines, same NIC (Qualcomm Atheros AR8151 v2.0, 4-port), triggered by rebooting a Mikrotik CCR2004 PCIe card that the ports are directly linked to: - Ubuntu 26.04.1 LTS, kernel 7.0.0-31-generic. The link-flap precursor, before the lockup was captured with a full trace elsewhere: atl1c 0000:05:00.0 enp5s0f0: NETDEV WATCHDOG: CPU: 4: transmit queue 2 timed out 489984 ms atl1c 0000:05:00.0: MAC state machine can't be idle since disabled for 10ms second atl1c 0000:05:00.0: atl1c: enp5s0f0 NIC Link is Up<65535 Mbps Full Duplex> 65535 (0xffff) here is the same value tpd_cons reads back once the loop below gets stuck. - Proxmox VE, kernel 7.0.14-11-pve. Same NIC/trigger, this time caught by the soft lockup watchdog with a full stack trace: watchdog: BUG: soft lockup - CPU#12 stuck for 354s! [napi/eth%d-0:329] CPU: 12 UID: 0 PID: 329 Comm: napi/eth%d-0 Tainted: P O L 7.0.14-11-pve #1 PREEMPT(lazy) RIP: 0010:atl1c_clean_tx+0x142/0x2d0 [atl1c] Call Trace: <TASK> __napi_poll+0x32/0x1e0 napi_threaded_poll_loop+0x286/0x2e0 napi_threaded_poll+0xfd/0x140 kthread+0xf7/0x130 ret_from_fork+0x2da/0x3a0 ret_from_fork_asm+0x1a/0x30 </TASK>
References
Impacted products
Vendor Product Version
Linux Linux Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
Version: 43250ddd75a35d1f7926d989a10fefd30c37eaa7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/atheros/atl1c/atl1c_main.c"
          ],
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.29"
            },
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              "version": "6.1.189",
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              "version": "7.2.9",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atl1c: fix soft lockup on out-of-range tpd_cons read\n\nThe hardware can report an out-of-range tpd_cons (seen as 0xffff)\nwhile the PCIe link/MAC is resetting. An out-of-range value can\nnever be reached and the loop below would spin forever. To avoid\na soft lockup treat it as \"nothing new to clean\" instead.\n\nReproduced on two machines, same NIC (Qualcomm Atheros AR8151 v2.0,\n4-port), triggered by rebooting a Mikrotik CCR2004 PCIe card that\nthe ports are directly linked to:\n\n- Ubuntu 26.04.1 LTS, kernel 7.0.0-31-generic. The link-flap\n  precursor, before the lockup was captured with a full trace\n  elsewhere:\n\n    atl1c 0000:05:00.0 enp5s0f0: NETDEV WATCHDOG: CPU: 4: transmit queue 2 timed out 489984 ms\n    atl1c 0000:05:00.0: MAC state machine can\u0027t be idle since disabled for 10ms second\n    atl1c 0000:05:00.0: atl1c: enp5s0f0 NIC Link is Up\u003c65535 Mbps Full Duplex\u003e\n\n  65535 (0xffff) here is the same value tpd_cons reads back once the\n  loop below gets stuck.\n\n- Proxmox VE, kernel 7.0.14-11-pve. Same NIC/trigger, this time\n  caught by the soft lockup watchdog with a full stack trace:\n\n    watchdog: BUG: soft lockup - CPU#12 stuck for 354s! [napi/eth%d-0:329]\n    CPU: 12 UID: 0 PID: 329 Comm: napi/eth%d-0 Tainted: P O L 7.0.14-11-pve #1 PREEMPT(lazy)\n    RIP: 0010:atl1c_clean_tx+0x142/0x2d0 [atl1c]\n    Call Trace:\n     \u003cTASK\u003e\n     __napi_poll+0x32/0x1e0\n     napi_threaded_poll_loop+0x286/0x2e0\n     napi_threaded_poll+0xfd/0x140\n     kthread+0xf7/0x130\n     ret_from_fork+0x2da/0x3a0\n     ret_from_fork_asm+0x1a/0x30\n     \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:20:26.482Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e7acd4cdeccbcdfd407adeb72b1eba14d1145b6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ea2576a4f5ec476f33169fdbe9090d2b038ad13"
        },
        {
          "url": "https://git.kernel.org/stable/c/4daf80da0c38b8cd92c111ad96cb38322aabf586"
        },
        {
          "url": "https://git.kernel.org/stable/c/57b55367b6e3accc55a989afeaf127063e3614dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f2cc71a2e2799d9c993c73f1bd36507eef6ae43"
        },
        {
          "url": "https://git.kernel.org/stable/c/586847400b1168a88917287ac02c2c91a620b841"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4ab263e40fcf7cfa38a43ec774067d32eb94e16"
        },
        {
          "url": "https://git.kernel.org/stable/c/36c2009d90f2210ef92e6f4f2850e8b57b09e754"
        }
      ],
      "title": "net: atl1c: fix soft lockup on out-of-range tpd_cons read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98489",
    "datePublished": "2026-10-18T15:16:16.084Z",
    "dateReserved": "2026-09-25T10:25:14.352Z",
    "dateUpdated": "2026-10-19T09:20:26.482Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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