Vulnerability-Lookup

CVE-2026-64457 (GCVE-0-2026-64457)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

virtio_pci: fix vq info pointer lookup via wrong index

Summary

In the Linux kernel, the following vulnerability has been resolved: virtio_pci: fix vq info pointer lookup via wrong index Unbinding a virtio balloon device: echo virtio0 > /sys/bus/virtio/drivers/virtio_balloon/unbind triggers a NULL pointer dereference. The dmesg says: BUG: kernel NULL pointer dereference, address: 0000000000000008 [...] RIP: 0010:__list_del_entry_valid_or_report+0x5/0xf0 Call Trace: <TASK> vp_del_vqs+0x121/0x230 remove_common+0x135/0x150 virtballoon_remove+0xee/0x100 virtio_dev_remove+0x3b/0x80 device_release_driver_internal+0x187/0x2c0 unbind_store+0xb9/0xe0 kernfs_fop_write_iter.llvm.11660790530567441834+0xf6/0x180 vfs_write+0x2a9/0x3b0 ksys_write+0x5c/0xd0 do_syscall_64+0x54/0x230 entry_SYSCALL_64_after_hwframe+0x29/0x31 [...] </TASK> The virtio_balloon device registers 5 queues (inflate, deflate, stats, free_page, reporting) but only the first two are unconditional. The stats, free_page and reporting queues are each conditional on their respective feature bits. When any of these features are absent, the corresponding vqs_info entry has name == NULL, creating holes in the array. The root cause is an indexing mismatch introduced when vq info storage was changed to be passed as an argument. vp_find_vqs_msix() and vp_find_vqs_intx() store the info pointer at vp_dev->vqs[i], where 'i' is the caller's sparse array index. However, the virtqueue itself gets vq->index assigned from queue_idx, a dense index that skips NULL entries. When holes exist, 'i' and queue_idx diverge. Later, vp_del_vqs() looks up info via vp_dev->vqs[vq->index] using the dense index into the sparsely-populated array, and hits NULL. Fix this by storing info at vp_dev->vqs[queue_idx] instead of vp_dev->vqs[i], so the store index matches the lookup index (vq->index). Apply the fix to both the MSIX and INTX paths.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/41e6dc1a10036c9f4…
https://git.kernel.org/stable/c/075bc3c779e1ea729…
https://git.kernel.org/stable/c/64a4c0befa77bcc01…
https://git.kernel.org/stable/c/f7d380fb525c13bdd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 89a1c435aec269d109ed46ca7bbb10fa8edf7ace , < 41e6dc1a10036c9f47057033f19af7e52ec464b6 (git) Affected: 89a1c435aec269d109ed46ca7bbb10fa8edf7ace , < 075bc3c779e1ea7294afabdcb7e0a49536959b28 (git) Affected: 89a1c435aec269d109ed46ca7bbb10fa8edf7ace , < 64a4c0befa77bcc01076aec9f93863ffd4ed06b7 (git) Affected: 89a1c435aec269d109ed46ca7bbb10fa8edf7ace , < f7d380fb525c13bdd114369a1979c80c346e6abc (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_pci: fix vq info pointer lookup via wrong index\n\nUnbinding a virtio balloon device:\n\n    echo virtio0 \u003e /sys/bus/virtio/drivers/virtio_balloon/unbind\n\ntriggers a NULL pointer dereference. The dmesg says:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000008\n    [...]\n    RIP: 0010:__list_del_entry_valid_or_report+0x5/0xf0\n    Call Trace:\n    \u003cTASK\u003e\n    vp_del_vqs+0x121/0x230\n    remove_common+0x135/0x150\n    virtballoon_remove+0xee/0x100\n    virtio_dev_remove+0x3b/0x80\n    device_release_driver_internal+0x187/0x2c0\n    unbind_store+0xb9/0xe0\n    kernfs_fop_write_iter.llvm.11660790530567441834+0xf6/0x180\n    vfs_write+0x2a9/0x3b0\n    ksys_write+0x5c/0xd0\n    do_syscall_64+0x54/0x230\n    entry_SYSCALL_64_after_hwframe+0x29/0x31\n    [...]\n    \u003c/TASK\u003e\n\nThe virtio_balloon device registers 5 queues (inflate, deflate, stats,\nfree_page, reporting) but only the first two are unconditional. The\nstats, free_page and reporting queues are each conditional on their\nrespective feature bits. When any of these features are absent, the\ncorresponding vqs_info entry has name == NULL, creating holes in the\narray.\n\nThe root cause is an indexing mismatch introduced when vq info storage\nwas changed to be passed as an argument. vp_find_vqs_msix() and\nvp_find_vqs_intx() store the info pointer at vp_dev-\u003evqs[i], where \u0027i\u0027\nis the caller\u0027s sparse array index. However, the virtqueue itself gets\nvq-\u003eindex assigned from queue_idx, a dense index that skips NULL\nentries. When holes exist, \u0027i\u0027 and queue_idx diverge. Later,\nvp_del_vqs() looks up info via vp_dev-\u003evqs[vq-\u003eindex] using the dense\nindex into the sparsely-populated array, and hits NULL.\n\nFix this by storing info at vp_dev-\u003evqs[queue_idx] instead of\nvp_dev-\u003evqs[i], so the store index matches the lookup index\n(vq-\u003eindex). Apply the fix to both the MSIX and INTX paths."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:25.364Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/41e6dc1a10036c9f47057033f19af7e52ec464b6"
        },
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          "url": "https://git.kernel.org/stable/c/075bc3c779e1ea7294afabdcb7e0a49536959b28"
        },
        {
          "url": "https://git.kernel.org/stable/c/64a4c0befa77bcc01076aec9f93863ffd4ed06b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7d380fb525c13bdd114369a1979c80c346e6abc"
        }
      ],
      "title": "virtio_pci: fix vq info pointer lookup via wrong index",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64457",
    "datePublished": "2026-07-25T08:51:25.364Z",
    "dateReserved": "2026-07-19T15:36:31.789Z",
    "dateUpdated": "2026-07-25T08:51:25.364Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64457",
      "date": "2026-07-26",
      "epss": "0.00175",
      "percentile": "0.07303"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:57Z",
      "cve": "CVE-2026-64457",
      "id": "CVE-2026-64457",
      "initial_release_date": "2026-07-25T15:58:57Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64457",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64457.json",
      "version": "2"
    }
  }
}

GHSA-GQWV-4RWR-X42G

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

virtio_pci: fix vq info pointer lookup via wrong index

Unbinding a virtio balloon device:

echo virtio0 > /sys/bus/virtio/drivers/virtio_balloon/unbind

triggers a NULL pointer dereference. The dmesg says:

BUG: kernel NULL pointer dereference, address: 0000000000000008
[...]
RIP: 0010:__list_del_entry_valid_or_report+0x5/0xf0
Call Trace:
<TASK>
vp_del_vqs+0x121/0x230
remove_common+0x135/0x150
virtballoon_remove+0xee/0x100
virtio_dev_remove+0x3b/0x80
device_release_driver_internal+0x187/0x2c0
unbind_store+0xb9/0xe0
kernfs_fop_write_iter.llvm.11660790530567441834+0xf6/0x180
vfs_write+0x2a9/0x3b0
ksys_write+0x5c/0xd0
do_syscall_64+0x54/0x230
entry_SYSCALL_64_after_hwframe+0x29/0x31
[...]
</TASK>

The virtio_balloon device registers 5 queues (inflate, deflate, stats, free_page, reporting) but only the first two are unconditional. The stats, free_page and reporting queues are each conditional on their respective feature bits. When any of these features are absent, the corresponding vqs_info entry has name == NULL, creating holes in the array.

The root cause is an indexing mismatch introduced when vq info storage was changed to be passed as an argument. vp_find_vqs_msix() and vp_find_vqs_intx() store the info pointer at vp_dev->vqs[i], where 'i' is the caller's sparse array index. However, the virtqueue itself gets vq->index assigned from queue_idx, a dense index that skips NULL entries. When holes exist, 'i' and queue_idx diverge. Later, vp_del_vqs() looks up info via vp_dev->vqs[vq->index] using the dense index into the sparsely-populated array, and hits NULL.

Fix this by storing info at vp_dev->vqs[queue_idx] instead of vp_dev->vqs[i], so the store index matches the lookup index (vq->index). Apply the fix to both the MSIX and INTX paths.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64457"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_pci: fix vq info pointer lookup via wrong index\n\nUnbinding a virtio balloon device:\n\n    echo virtio0 \u003e /sys/bus/virtio/drivers/virtio_balloon/unbind\n\ntriggers a NULL pointer dereference. The dmesg says:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000008\n    [...]\n    RIP: 0010:__list_del_entry_valid_or_report+0x5/0xf0\n    Call Trace:\n    \u003cTASK\u003e\n    vp_del_vqs+0x121/0x230\n    remove_common+0x135/0x150\n    virtballoon_remove+0xee/0x100\n    virtio_dev_remove+0x3b/0x80\n    device_release_driver_internal+0x187/0x2c0\n    unbind_store+0xb9/0xe0\n    kernfs_fop_write_iter.llvm.11660790530567441834+0xf6/0x180\n    vfs_write+0x2a9/0x3b0\n    ksys_write+0x5c/0xd0\n    do_syscall_64+0x54/0x230\n    entry_SYSCALL_64_after_hwframe+0x29/0x31\n    [...]\n    \u003c/TASK\u003e\n\nThe virtio_balloon device registers 5 queues (inflate, deflate, stats,\nfree_page, reporting) but only the first two are unconditional. The\nstats, free_page and reporting queues are each conditional on their\nrespective feature bits. When any of these features are absent, the\ncorresponding vqs_info entry has name == NULL, creating holes in the\narray.\n\nThe root cause is an indexing mismatch introduced when vq info storage\nwas changed to be passed as an argument. vp_find_vqs_msix() and\nvp_find_vqs_intx() store the info pointer at vp_dev-\u003evqs[i], where \u0027i\u0027\nis the caller\u0027s sparse array index. However, the virtqueue itself gets\nvq-\u003eindex assigned from queue_idx, a dense index that skips NULL\nentries. When holes exist, \u0027i\u0027 and queue_idx diverge. Later,\nvp_del_vqs() looks up info via vp_dev-\u003evqs[vq-\u003eindex] using the dense\nindex into the sparsely-populated array, and hits NULL.\n\nFix this by storing info at vp_dev-\u003evqs[queue_idx] instead of\nvp_dev-\u003evqs[i], so the store index matches the lookup index\n(vq-\u003eindex). Apply the fix to both the MSIX and INTX paths.",
  "id": "GHSA-gqwv-4rwr-x42g",
  "modified": "2026-07-25T12:31:36Z",
  "published": "2026-07-25T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64457"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/075bc3c779e1ea7294afabdcb7e0a49536959b28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e6dc1a10036c9f47057033f19af7e52ec464b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64a4c0befa77bcc01076aec9f93863ffd4ed06b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7d380fb525c13bdd114369a1979c80c346e6abc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64457 (GCVE-0-2026-64457)

GHSA-GQWV-4RWR-X42G

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Nomenclature