CVE-2026-72237
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/amd/brs: Fix kernel address leakage
A user-only branch stack can contain branches that originate from the kernel. As a result, kernel addresses are exposed to user space even when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors supporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries such as SYSRET/interrupt returns for which the branch-from addresses are in the kernel.
E.g.
BRS provides no hardware branch filtering, so privilege level filtering is performed entirely in software.
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However, amd_brs_match_plm() only validates the branch-to address against the requested privilege levels. For branches from the kernel to user space, the branch-from address is left unchecked and is leaked. Extend the software filter to also validate the branch-from address, so that any branch record whose branch-from address is in the kernel is dropped when PERF_SAMPLE_BRANCH_USER is requested.
Detalles técnicos trazas, registros y código del informe original
$ perf record -j any,u -c 4000 -e branch-brs -o - -- \
perf bench syscall basic --loop 1000 | \
perf script -i - -F brstack|tr ' ' '\n'| \
grep -E '0x[89a-f][0-9a-f]{15}'
...
0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//-
0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//-
0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//-
...CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491
- https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d
- https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154
- https://git.kernel.org/stable/c/4f949bc3913a6e3ce3b8574ac6ed1da8ec7a5ad1
- https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70
- https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-72237",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "4f949bc3913a6e3ce3b8574ac6ed1da8ec7a5ad1",
"versionType": "git"
},
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "ac44b4a3d6137489f8fa2e794b12e849c6b22eaa",
"versionType": "git"
},
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "90843d00dbc61220b66408ea0d8775cae9e51f70",
"versionType": "git"
},
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "046f6244da9b68e463a849b21446b9424e531491",
"versionType": "git"
},
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "2e706be56f418718bb3ae66c0aa94f9b61150e6d",
"versionType": "git"
},
{
"status": "affected",
"version": "8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08",
"lessThan": "47915e855fb38b42133e31ba917d99565f862154",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/events/amd/brs.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": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"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/brs.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-15T06:21:50.733",
"references": [
{
"url": "https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4f949bc3913a6e3ce3b8574ac6ed1da8ec7a5ad1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd/brs: Fix kernel address leakage\n\nA user-only branch stack can contain branches that originate from\nthe kernel. As a result, kernel addresses are exposed to user space\neven when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors\nsupporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries\nsuch as SYSRET/interrupt returns for which the branch-from addresses\nare in the kernel.\n\nE.g.\n\n $ perf record -j any,u -c 4000 -e branch-brs -o - -- \\\n perf bench syscall basic --loop 1000 | \\\n perf script -i - -F brstack|tr ' ' '\\n'| \\\n grep -E '0x[89a-f][0-9a-f]{15}'\n\n ...\n 0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//-\n 0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//-\n 0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//-\n ...\n\nBRS provides no hardware branch filtering, so privilege level\nfiltering is performed entirely in software. However, amd_brs_match_plm()\nonly validates the branch-to address against the requested privilege\nlevels. For branches from the kernel to user space, the branch-from\naddress is left unchecked and is leaked. Extend the software filter to\nalso validate the branch-from address, so that any branch record whose\nbranch-from address is in the kernel is dropped when\nPERF_SAMPLE_BRANCH_USER is requested."
}
],
"lastModified": "2026-08-19T17:21:00.693",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}