Vulnerability-Lookup

FKIE_CVE-2026-72325

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd/core: Avoid enabling BRS from the SVM reload path Branch Sampling (BRS) and Last Branch Record (LBR) are mutually exclusive hardware features, and users of both are tracked via cpuc->lbr_users. When SVM is toggled on a CPU, the host perf events are reprogrammed to update the HostOnly filter bit (set when virtualization is enabled, cleared when it is disabled). On PerfMonV2-capable processors, this reprogramming is performed by calling amd_pmu_enable_all() to rewrite the event selectors. However, amd_pmu_enable_all() also calls amd_brs_enable_all(), which enables BRS whenever cpuc->lbr_users > 0. Having active LBR events satisfies this gating on processors that have LBR but not BRS. The kernel then tries to set the BRS enable bit in DebugExtnCfg (MSR 0xc000010f). Since that bit is deprecated on such hardware, the write results in a #GP: Call Trace: <IRQ> amd_pmu_enable_all+0x1d/0x90 amd_pmu_disable_virt+0x62/0xb0 kvm_arch_disable_virtualization_cpu+0xa/0x40 [kvm] hardware_disable_nolock+0x1a/0x30 [kvm] __flush_smp_call_function_queue+0x9b/0x410 __sysvec_call_function+0x18/0xc0 sysvec_call_function+0x69/0x90 </IRQ> <TASK> asm_sysvec_call_function+0x16/0x20 RIP: 0010:cpuidle_enter_state+0xc4/0x450 ? cpuidle_enter_state+0xb7/0x450 cpuidle_enter+0x29/0x40 cpuidle_idle_call+0xf5/0x160 do_idle+0x7b/0xe0 cpu_startup_entry+0x26/0x30 start_secondary+0x115/0x140 secondary_startup_64_no_verify+0x194/0x19b </TASK> Fix this by ensuring that BRS is not enabled from the event selector reprogramming path even when cpuc->lbr_users > 0.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/46d0fd8535edce31f15e48d2de1bdee39a4850e5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7cc438c99bba324a0562b1bafa747b10f7e251df
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e9b1a7411a667539c2f55e720bbb5f623b526a32

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/amd/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9b1a7411a667539c2f55e720bbb5f623b526a32",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "7cc438c99bba324a0562b1bafa747b10f7e251df",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "46d0fd8535edce31f15e48d2de1bdee39a4850e5",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/amd/core.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": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nperf/x86/amd/core: Avoid enabling BRS from the SVM reload path\n\nBranch Sampling (BRS) and Last Branch Record (LBR) are mutually\nexclusive hardware features, and users of both are tracked via\ncpuc-\u003elbr_users.\n\nWhen SVM is toggled on a CPU, the host perf events are reprogrammed to\nupdate the HostOnly filter bit (set when virtualization is enabled,\ncleared when it is disabled). On PerfMonV2-capable processors, this\nreprogramming is performed by calling amd_pmu_enable_all() to rewrite\nthe event selectors. However, amd_pmu_enable_all() also calls\namd_brs_enable_all(), which enables BRS whenever cpuc-\u003elbr_users \u003e 0.\nHaving active LBR events satisfies this gating on processors that have\nLBR but not BRS. The kernel then tries to set the BRS enable bit in\nDebugExtnCfg (MSR 0xc000010f). Since that bit is deprecated on such\nhardware, the write results in a #GP:\n\n  Call Trace:\n   \u003cIRQ\u003e\n   amd_pmu_enable_all+0x1d/0x90\n   amd_pmu_disable_virt+0x62/0xb0\n   kvm_arch_disable_virtualization_cpu+0xa/0x40 [kvm]\n   hardware_disable_nolock+0x1a/0x30 [kvm]\n   __flush_smp_call_function_queue+0x9b/0x410\n   __sysvec_call_function+0x18/0xc0\n   sysvec_call_function+0x69/0x90\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   asm_sysvec_call_function+0x16/0x20\n  RIP: 0010:cpuidle_enter_state+0xc4/0x450\n   ? cpuidle_enter_state+0xb7/0x450\n   cpuidle_enter+0x29/0x40\n   cpuidle_idle_call+0xf5/0x160\n   do_idle+0x7b/0xe0\n   cpu_startup_entry+0x26/0x30\n   start_secondary+0x115/0x140\n   secondary_startup_64_no_verify+0x194/0x19b\n   \u003c/TASK\u003e\n\nFix this by ensuring that BRS is not enabled from the event selector\nreprogramming path even when cpuc-\u003elbr_users \u003e 0."
    }
  ],
  "id": "CVE-2026-72325",
  "lastModified": "2026-08-17T06:18:36.053",
  "metrics": {},
  "published": "2026-08-15T06:22:05.547",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/46d0fd8535edce31f15e48d2de1bdee39a4850e5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7cc438c99bba324a0562b1bafa747b10f7e251df"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9b1a7411a667539c2f55e720bbb5f623b526a32"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-72325 (GCVE-0-2026-72325)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:12

Title

perf/x86/amd/core: Avoid enabling BRS from the SVM reload path

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e9b1a7411a667539c…
https://git.kernel.org/stable/c/7cc438c99bba324a0…
https://git.kernel.org/stable/c/46d0fd8535edce31f…
https://git.kernel.org/stable/c/07c60dda9c059c09f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bae19fdd7e9e759580ac4693d2df3bc23ab415d7 , < e9b1a7411a667539c2f55e720bbb5f623b526a32 (git) Affected: bae19fdd7e9e759580ac4693d2df3bc23ab415d7 , < 7cc438c99bba324a0562b1bafa747b10f7e251df (git) Affected: bae19fdd7e9e759580ac4693d2df3bc23ab415d7 , < 46d0fd8535edce31f15e48d2de1bdee39a4850e5 (git) Affected: bae19fdd7e9e759580ac4693d2df3bc23ab415d7 , < 07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/amd/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9b1a7411a667539c2f55e720bbb5f623b526a32",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "7cc438c99bba324a0562b1bafa747b10f7e251df",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "46d0fd8535edce31f15e48d2de1bdee39a4850e5",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            },
            {
              "lessThan": "07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2",
              "status": "affected",
              "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/amd/core.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": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd/core: Avoid enabling BRS from the SVM reload path\n\nBranch Sampling (BRS) and Last Branch Record (LBR) are mutually\nexclusive hardware features, and users of both are tracked via\ncpuc-\u003elbr_users.\n\nWhen SVM is toggled on a CPU, the host perf events are reprogrammed to\nupdate the HostOnly filter bit (set when virtualization is enabled,\ncleared when it is disabled). On PerfMonV2-capable processors, this\nreprogramming is performed by calling amd_pmu_enable_all() to rewrite\nthe event selectors. However, amd_pmu_enable_all() also calls\namd_brs_enable_all(), which enables BRS whenever cpuc-\u003elbr_users \u003e 0.\nHaving active LBR events satisfies this gating on processors that have\nLBR but not BRS. The kernel then tries to set the BRS enable bit in\nDebugExtnCfg (MSR 0xc000010f). Since that bit is deprecated on such\nhardware, the write results in a #GP:\n\n  Call Trace:\n   \u003cIRQ\u003e\n   amd_pmu_enable_all+0x1d/0x90\n   amd_pmu_disable_virt+0x62/0xb0\n   kvm_arch_disable_virtualization_cpu+0xa/0x40 [kvm]\n   hardware_disable_nolock+0x1a/0x30 [kvm]\n   __flush_smp_call_function_queue+0x9b/0x410\n   __sysvec_call_function+0x18/0xc0\n   sysvec_call_function+0x69/0x90\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   asm_sysvec_call_function+0x16/0x20\n  RIP: 0010:cpuidle_enter_state+0xc4/0x450\n   ? cpuidle_enter_state+0xb7/0x450\n   cpuidle_enter+0x29/0x40\n   cpuidle_idle_call+0xf5/0x160\n   do_idle+0x7b/0xe0\n   cpu_startup_entry+0x26/0x30\n   start_secondary+0x115/0x140\n   secondary_startup_64_no_verify+0x194/0x19b\n   \u003c/TASK\u003e\n\nFix this by ensuring that BRS is not enabled from the event selector\nreprogramming path even when cpuc-\u003elbr_users \u003e 0."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:12:31.697Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e9b1a7411a667539c2f55e720bbb5f623b526a32"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cc438c99bba324a0562b1bafa747b10f7e251df"
        },
        {
          "url": "https://git.kernel.org/stable/c/46d0fd8535edce31f15e48d2de1bdee39a4850e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2"
        }
      ],
      "title": "perf/x86/amd/core: Avoid enabling BRS from the SVM reload path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72325",
    "datePublished": "2026-08-15T05:55:36.148Z",
    "dateReserved": "2026-08-09T03:40:39.919Z",
    "dateUpdated": "2026-08-17T05:12:31.697Z",
    "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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-72325

CVE-2026-72325 (GCVE-0-2026-72325)

Tags

Sightings

Nomenclature