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net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98237

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98237

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "3ed36ee1b29b028f6bc2ebe100152f61a33df05a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "19b5e8dd884a530d04482e1a8e547f43cad17ed7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "24ade82d6d993274e99c2c6998848751c35292e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "8dad70ff7e25cbcfbcb5101fdbf36d98003eb653",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "829fec45122da58d77a55a3b7ca514dafab98e77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa730a9905b7b079ef2fffdab7f15dbb842f5c7c",
        "lessThan": "5d063822ac5184939c1ed377a339a01d8ae814e8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wwan/mhi_wwan_mbim.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wwan/mhi_wwan_mbim.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98237

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38317 · Revision 1
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Publisher date
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