GHSA-9726-H75P-MC3X

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

KVM: arm64: vgic: Handle race between interrupt affinity change and LPI disabling

Hyunwoo Kim reports some really bad races should the following situation occur:

  • LPI-I is pending in vcpu-B's AP list
  • vcpu-A writes to vcpu-B's RD to disable its LPIs
  • vcpu-C moves I from B to C

If the last two race nicely enough, vgic_prune_ap_list() can drop the irq and AP list locks, reacquire them, and in the interval the irq has been freed. UAF follows.

The fix is two-fold:

  • Before dropping the irq and ap_list locks, take a reference on the irq

  • Do not try to handle migration of the pending bit: there is no expectation that this state is retained, as per the architecture

With that, we're sure that the interrupt is still around, and we safely remove it from the AP list as it has no target at this stage (unless another interrupt fires, but that's another story).

Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72288"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:00Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic: Handle race between interrupt affinity change and LPI disabling\n\nHyunwoo Kim reports some really bad races should the following\nsituation occur:\n\n- LPI-I is pending in vcpu-B\u0027s AP list\n- vcpu-A writes to vcpu-B\u0027s RD to disable its LPIs\n- vcpu-C moves I from B to C\n\nIf the last two race nicely enough, vgic_prune_ap_list() can drop\nthe irq and AP list locks, reacquire them, and in the interval\nthe irq has been freed. UAF follows.\n\nThe fix is two-fold:\n\n- Before dropping the irq and ap_list locks, take a reference on\n  the irq\n\n- Do not try to handle migration of the pending bit: there is no\n  expectation that this state is retained, as per the architecture\n\nWith that, we\u0027re sure that the interrupt is still around, and we\nsafely remove it from the AP list as it has no target at this\nstage (unless another interrupt fires, but that\u0027s another story).",
  "id": "GHSA-9726-h75p-mc3x",
  "modified": "2026-08-17T06:33:22Z",
  "published": "2026-08-15T06:32:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72288"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7258770e5814f15e8308ebda82ac9acf6964ba8e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1a89d12d35a8256d2b170ced0b1c86851f3def2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d19dca8194ebed371e624331c6be2cb73b562caf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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