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

Type: advisorySource: Official CVE List1 source record

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: 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 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 Fix this by ensuring t

Announced Source revision 1
Original source ↗

CVE-2026-72325

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72325

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
        "lessThan": "3b0aa139ba09a5b73c0f300e652076232f869f68",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
        "lessThan": "e9b1a7411a667539c2f55e720bbb5f623b526a32",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
        "lessThan": "7cc438c99bba324a0562b1bafa747b10f7e251df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
        "lessThan": "46d0fd8535edce31f15e48d2de1bdee39a4850e5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae19fdd7e9e759580ac4693d2df3bc23ab415d7",
        "lessThan": "07c60dda9c059c09f83d42a3ebda2e7cc1cf3bc2",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/events/amd/core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/x86/events/amd/core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72325

Source reference: /cveMetadata/cveId

Publisher severity

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Event
#46503 · Revision 1
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