FKIE_CVE-2026-99251

Vulnerability from fkie_nvd - Published: 2026-11-03 12:17 - Updated: 2026-11-03 12:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: Avoid infinite retry loop in init_vp_index() There is a retry loop in init_vp_index() where the CPUs from a certain node are stripped out if they have already been in the allocated cpumask or not in HK_TYPE_MANAGED_IRQ housekeeping cpumask. If there is no CPU left, the allocated cpumask is ignored and the process is retried again. However, if the HK_TYPE_MANAGED_IRQ housekeeping cpumask turns out not to contain any CPU in that particular node, that will become an infinite retry loop. This particular problem was reported by sashiko [1]. This should rarely happen, but we still need to guard against this. Fix this infinite loop problem by also skipping NUMA node that has no housekeeping CPU in the inner while loop of init_vp_index(). Also update the early abort check to check for the absence of online housekeeping CPUs instead of just the emptiness of the cpumask. As the outer for loop will only be reached if the housekeeping cpumask has at least one online CPU, a NUMA node with housekeeping CPUs will eventually be found.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/15dd3429f0e76ca071657e480cb7e6ff3a1af730
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7141331f2d245efc07175802a6bf76badec871ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95fec47cdbf747b81ab22affd7252dda6050ad0c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3993f6dc106ff416c7a613c631e1e0af451aed7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f561392afb44a8a42c54c1cfd3f33dace0b50537
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hv/channel_mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b3993f6dc106ff416c7a613c631e1e0af451aed7",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            },
            {
              "lessThan": "f561392afb44a8a42c54c1cfd3f33dace0b50537",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            },
            {
              "lessThan": "15dd3429f0e76ca071657e480cb7e6ff3a1af730",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            },
            {
              "lessThan": "7141331f2d245efc07175802a6bf76badec871ed",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            },
            {
              "lessThan": "95fec47cdbf747b81ab22affd7252dda6050ad0c",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            },
            {
              "lessThan": "32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd",
              "status": "affected",
              "version": "6640b5df1a38801be6d0595c8cd2177d968d7ee0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hv/channel_mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: Avoid infinite retry loop in init_vp_index()\n\nThere is a retry loop in init_vp_index() where the CPUs from a certain\nnode are stripped out if they have already been in the allocated cpumask\nor not in HK_TYPE_MANAGED_IRQ housekeeping cpumask. If there is no\nCPU left, the allocated cpumask is ignored and the process is retried\nagain. However, if the HK_TYPE_MANAGED_IRQ housekeeping cpumask turns\nout not to contain any CPU in that particular node, that will become an\ninfinite retry loop.  This particular problem was reported by sashiko\n[1]. This should rarely happen, but we still need to guard against this.\n\nFix this infinite loop problem by also skipping NUMA node that has no\nhousekeeping CPU in the inner while loop of init_vp_index(). Also update\nthe early abort check to check for the absence of online housekeeping\nCPUs instead of just the emptiness of the cpumask. As the outer for\nloop will only be reached if the housekeeping cpumask has at least one\nonline CPU, a NUMA node with housekeeping CPUs will eventually be found."
    }
  ],
  "id": "CVE-2026-99251",
  "lastModified": "2026-11-03T12:17:31.740",
  "metrics": {},
  "published": "2026-11-03T12:17:31.740",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/15dd3429f0e76ca071657e480cb7e6ff3a1af730"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7141331f2d245efc07175802a6bf76badec871ed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95fec47cdbf747b81ab22affd7252dda6050ad0c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b3993f6dc106ff416c7a613c631e1e0af451aed7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f561392afb44a8a42c54c1cfd3f33dace0b50537"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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