CVE-2026-98489 (GCVE-0-2026-98489)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:16 – Updated: 2026-10-19 09:20
VLAI
Title
net: atl1c: fix soft lockup on out-of-range tpd_cons read
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>
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < e7acd4cdeccbcdfd407adeb72b1eba14d1145b6f (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 5ea2576a4f5ec476f33169fdbe9090d2b038ad13 (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 4daf80da0c38b8cd92c111ad96cb38322aabf586 (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 57b55367b6e3accc55a989afeaf127063e3614dc (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 9f2cc71a2e2799d9c993c73f1bd36507eef6ae43 (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 586847400b1168a88917287ac02c2c91a620b841 (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < d4ab263e40fcf7cfa38a43ec774067d32eb94e16 (git)
Affected: 43250ddd75a35d1f7926d989a10fefd30c37eaa7 , < 36c2009d90f2210ef92e6f4f2850e8b57b09e754 (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "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"
        }
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    "dateReserved": "2026-09-25T10:25:14.352Z",
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      "date": "2026-11-04",
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      "percentile": "0.07279"
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      "cve": "CVE-2026-98489",
      "id": "msrc_CVE-2026-98489",
      "initial_release_date": "2026-10-20T01:06:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
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      "title": "net: atl1c: fix soft lockup on out-of-range tpd_cons read",
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            "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"
          }
        ],
        "id": "CVE-2026-98489",
        "lastModified": "2026-10-19T10:19:00.667",
        "metrics": {},
        "published": "2026-10-18T16:16:59.733",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/36c2009d90f2210ef92e6f4f2850e8b57b09e754"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4daf80da0c38b8cd92c111ad96cb38322aabf586"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/57b55367b6e3accc55a989afeaf127063e3614dc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/586847400b1168a88917287ac02c2c91a620b841"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5ea2576a4f5ec476f33169fdbe9090d2b038ad13"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9f2cc71a2e2799d9c993c73f1bd36507eef6ae43"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d4ab263e40fcf7cfa38a43ec774067d32eb94e16"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e7acd4cdeccbcdfd407adeb72b1eba14d1145b6f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:01:22+00:00",
      "cve": "CVE-2026-98489",
      "id": "CVE-2026-98489",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: atl1c: fix soft lockup on out-of-range tpd_cons read",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98489.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-22T16:38:03Z",
      "cve": "CVE-2026-98489",
      "id": "CVE-2026-98489",
      "initial_release_date": "2026-10-22T16:38:03Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98489",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98489.json",
      "version": "2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.