Vulnerability-Lookup

FKIE_CVE-2026-46316

Vulnerability from fkie_nvd - Published: 2026-06-09 13:16 - Updated: 2026-07-30 12:18

Severity

9.3 (Critical) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry vgic_its_invalidate_cache() walks the per-ITS translation cache with xa_for_each() and drops the cache's reference on each entry with vgic_put_irq(). It puts the iterated pointer, though, rather than the value returned by xa_erase(). The function is called from contexts that do not exclude one another: the ITS command handlers hold its_lock, the GITS_CTLR write path holds cmd_lock, and the path that clears EnableLPIs in a redistributor's GICR_CTLR holds neither. Two or more of them can drain the same cache concurrently, and if each one observes the same entry, erases it and then puts it, the single reference the cache holds on that entry is dropped more than once. The entry can then be freed while an ITE still maps it. xa_erase() is atomic and returns the previous entry, so put only the entry that this context actually removed. The cache reference is then dropped exactly once per entry even when the invalidations run concurrently, and the behavior is unchanged when only one context runs.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34911	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36018	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:38902
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:39371
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:40764
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:40779
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:40787
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:44231
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-46316	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2486982	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry\n\nvgic_its_invalidate_cache() walks the per-ITS translation cache with\nxa_for_each() and drops the cache\u0027s reference on each entry with\nvgic_put_irq(). It puts the iterated pointer, though, rather than the\nvalue returned by xa_erase().\n\nThe function is called from contexts that do not exclude one another: the\nITS command handlers hold its_lock, the GITS_CTLR write path holds\ncmd_lock, and the path that clears EnableLPIs in a redistributor\u0027s\nGICR_CTLR holds neither. Two or more of them can drain the same cache\nconcurrently, and if each one observes the same entry, erases it and then\nputs it, the single reference the cache holds on that entry is dropped\nmore than once. The entry can then be freed while an ITE still maps it.\n\nxa_erase() is atomic and returns the previous entry, so put only the entry\nthat this context actually removed. The cache reference is then dropped\nexactly once per entry even when the invalidations run concurrently, and\nthe behavior is unchanged when only one context runs."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nKVM: arm64: vgic-its: Eliminar la referencia de la cach\u00e9 de traducci\u00f3n solo para la entrada borrada\n\nvgic_its_invalidate_cache() recorre la cach\u00e9 de traducci\u00f3n por ITS con xa_for_each() y elimina la referencia de la cach\u00e9 en cada entrada con vgic_put_irq(). Sin embargo, libera el puntero iterado, en lugar del valor devuelto por xa_erase().\n\nLa funci\u00f3n es llamada desde contextos que no se excluyen mutuamente: los manejadores de comandos ITS mantienen its_lock, la ruta de escritura de GITS_CTLR mantiene cmd_lock, y la ruta que borra EnableLPIs en el GICR_CTLR de un redistribuidor no mantiene ninguno. Dos o m\u00e1s de ellos pueden vaciar la misma cach\u00e9 concurrentemente, y si cada uno observa la misma entrada, la borra y luego la libera, la \u00fanica referencia que la cach\u00e9 mantiene sobre esa entrada se elimina m\u00e1s de una vez. La entrada puede entonces ser liberada mientras un ITE todav\u00eda la mapea.\n\nxa_erase() es at\u00f3mica y devuelve la entrada anterior, as\u00ed que libera solo la entrada que este contexto realmente elimin\u00f3. La referencia de la cach\u00e9 se elimina entonces exactamente una vez por entrada incluso cuando las invalidaciones se ejecutan concurrentemente, y el comportamiento no cambia cuando solo se ejecuta un contexto."
    }
  ],
  "id": "CVE-2026-46316",
  "lastModified": "2026-07-30T12:18:51.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
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        "type": "Secondary"
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          "baseScore": 7.0,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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  "published": "2026-06-09T13:16:36.887",
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CVE-2026-46316 (GCVE-0-2026-46316)

Vulnerability from cvelistv5 – Published: 2026-06-09 11:52 – Updated: 2026-08-05 12:31

Title

KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry

Summary

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

7 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-911 - Improper Update of Reference Count

Assigner

Linux

References

15 references

URL	Tags
https://git.kernel.org/stable/c/b7b72e88046328c9f…
https://git.kernel.org/stable/c/2bbc395e81bd29c54…
https://git.kernel.org/stable/c/9121f4605ab94969f…
https://git.kernel.org/stable/c/13031fb6b8357fbbc…
https://access.redhat.com/security/cve/CVE-2026-46316	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2486982	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:44231	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:40787	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:40779	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:40764	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39371	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34911	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38902	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36018	vendor-advisoryx_refsource_REDHAT

Impacted products

15 products

Vendor	Product	Version
Linux	Linux	Affected: 8201d1028caa4fae88e222c4e8cf541fdf45b821 , < b7b72e88046328c9fdc638fe887d4240257dd5dc (git) Affected: 8201d1028caa4fae88e222c4e8cf541fdf45b821 , < 2bbc395e81bd29c543a0529a678327e932a7ec69 (git) Affected: 8201d1028caa4fae88e222c4e8cf541fdf45b821 , < 9121f4605ab94969f62d1b5714ca3c6c69bd202f (git) Affected: 8201d1028caa4fae88e222c4e8cf541fdf45b821 , < 13031fb6b8357fbbcded2a7f4cba73e4781ee594 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:6.12.0-211.30.1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:6.12.0-55.88.1.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:5.14.0-687.22.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:5.14.0-570.127.1.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat OpenShift Container Platform 4.19	Unaffected: 4.19.9.6.202607220857-0 , < * (rpm) cpe:/a:redhat:openshift:4.19::el9
Red Hat	Red Hat OpenShift Container Platform 4.20	Unaffected: 4.20.9.6.202607151937-0 , < * (rpm) cpe:/a:redhat:openshift:4.20::el9
Red Hat	Red Hat OpenShift Container Platform 4.21	Unaffected: 4.21.9.6.202607151836-0 , < * (rpm) cpe:/a:redhat:openshift:4.21::el9
Red Hat	Red Hat OpenShift Container Platform 4.22	Unaffected: 4.22.9.8.202607152026-0 , < * (rpm) cpe:/a:redhat:openshift:4.22::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux for NVIDIA 26	cpe:/a:redhat:enterprise_linux_nvidia:

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry\n\nvgic_its_invalidate_cache() walks the per-ITS translation cache with\nxa_for_each() and drops the cache\u0027s reference on each entry with\nvgic_put_irq(). It puts the iterated pointer, though, rather than the\nvalue returned by xa_erase().\n\nThe function is called from contexts that do not exclude one another: the\nITS command handlers hold its_lock, the GITS_CTLR write path holds\ncmd_lock, and the path that clears EnableLPIs in a redistributor\u0027s\nGICR_CTLR holds neither. Two or more of them can drain the same cache\nconcurrently, and if each one observes the same entry, erases it and then\nputs it, the single reference the cache holds on that entry is dropped\nmore than once. The entry can then be freed while an ITE still maps it.\n\nxa_erase() is atomic and returns the previous entry, so put only the entry\nthat this context actually removed. The cache reference is then dropped\nexactly once per entry even when the invalidations run concurrently, and\nthe behavior is unchanged when only one context runs."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached only from KVM guest MMIO traps on GICv3 ITS registers (GITS_CTLR/CWRITER command processing) and redistributor GICR_CTLR LPI-disable writes, not from any network-facing host protocol.\nAC:L - A guest controls all racing contexts by pinning vCPUs to run concurrent ITS commands, GITS_CTLR disable, and GICR_CTLR LPI-disable on the same ITS translation cache; the attacker creates and wins the race rather than depending on uncontrollable host timing.\nPR:N - No host privileges are required beyond running code in an assigned KVM guest (e.g. a cloud VM tenant on arm64); exploitation needs guest-kernel access to GIC MMIO, not host root or capabilities in the init namespace.\nUI:N - Exploitation is fully attacker-driven from within the guest VM and does not require any victim user or administrator action on the host.\nS:C - The use-after-free corrupts host-kernel heap memory (`struct vgic_irq`) from guest-controlled VGIC operations, crossing the guest-to-host virtualization security boundary with VM-escape impact.\nC:H - Premature `vgic_put_irq()` frees the LPI `vgic_irq` while an ITE still maps it, yielding a kernel heap use-after-free that can be leveraged for arbitrary host memory disclosure via subsequent IRQ structure dereferences.\nI:H - The dangling `vgic_irq` pointer allows attacker-influenced writes through IRQ state fields (`irq_lock`, `pending_latch`, `target_vcpu`, list heads), enabling heap grooming and potential host control-flow or data corruption.\nA:H - The refcount underflow frees live kernel objects still in use by the ITS, causing host kernel oops/panic or hang during subsequent LPI delivery, MSI injection, or ITS command handling."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:11.943Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69"
        },
        {
          "url": "https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f"
        },
        {
          "url": "https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594"
        }
      ],
      "title": "KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46316",
    "datePublished": "2026-06-09T11:52:29.349Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-08-05T12:31:11.943Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-46316

CVE-2026-46316 (GCVE-0-2026-46316)

Tags

Sightings

Nomenclature