CVE-2026-98237 (GCVE-0-2026-98237)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45
VLAI
Title
net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain
Summary
In the Linux kernel, the following vulnerability has been resolved: net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain The NDP traversal in mhi_mbim_rx() only stops when wNextNdpIndex is zero. Nothing requires the offsets to advance, so a modem that points an NDP at itself, or at an earlier NDP, keeps the loop spinning forever on one CPU. Break out when the next NDP offset is not larger than the current one. Verified in a QEMU guest with a fault injector feeding the driver's receive callback an NTB whose single NDP points at itself: the unpatched driver spins in mhi_mbim_rx() with one CPU pinned at 100% and the thread never returns. With this check the loop terminates within one iteration. Changes in v2: move the non-increasing check to the wNextNdpIndex retrieval site, as suggested by Loic Poulain, instead of tracking the previous offset in a separate variable.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6664 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 3ed36ee1b29b028f6bc2ebe100152f61a33df05a (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526 (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 19b5e8dd884a530d04482e1a8e547f43cad17ed7 (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 24ade82d6d993274e99c2c6998848751c35292e7 (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 8dad70ff7e25cbcfbcb5101fdbf36d98003eb653 (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 829fec45122da58d77a55a3b7ca514dafab98e77 (git)
Affected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c , < 5d063822ac5184939c1ed377a339a01d8ae814e8 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (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: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain\n\nThe NDP traversal in mhi_mbim_rx() only stops when wNextNdpIndex is\nzero.  Nothing requires the offsets to advance, so a modem that\npoints an NDP at itself, or at an earlier NDP, keeps the loop\nspinning forever on one CPU.\n\nBreak out when the next NDP offset is not larger than the current\none.\n\n\nVerified in a QEMU guest with a fault injector feeding the driver\u0027s\nreceive callback an NTB whose single NDP points at itself: the\nunpatched driver spins in mhi_mbim_rx() with one CPU pinned at 100%\nand the thread never returns.  With this check the loop terminates\nwithin one iteration.\n\nChanges in v2: move the non-increasing check to the wNextNdpIndex\nretrieval site, as suggested by Loic Poulain, instead of tracking\nthe previous offset in a separate variable."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-09-25T10:25:14.329Z",
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    "state": "PUBLISHED"
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      "percentile": "0.07085"
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      "id": "msrc_CVE-2026-98237",
      "initial_release_date": "2026-10-07T01:23:11.000Z",
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      "source": "Microsoft CSAF VEX",
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      "title": "net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain\n\nThe NDP traversal in mhi_mbim_rx() only stops when wNextNdpIndex is\nzero.  Nothing requires the offsets to advance, so a modem that\npoints an NDP at itself, or at an earlier NDP, keeps the loop\nspinning forever on one CPU.\n\nBreak out when the next NDP offset is not larger than the current\none.\n\n\nVerified in a QEMU guest with a fault injector feeding the driver\u0027s\nreceive callback an NTB whose single NDP points at itself: the\nunpatched driver spins in mhi_mbim_rx() with one CPU pinned at 100%\nand the thread never returns.  With this check the loop terminates\nwithin one iteration.\n\nChanges in v2: move the non-increasing check to the wNextNdpIndex\nretrieval site, as suggested by Loic Poulain, instead of tracking\nthe previous offset in a separate variable."
          }
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      "cve": "CVE-2026-98237",
      "id": "CVE-2026-98237",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98237.json",
      "version": "3"
    }
  }
}



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