CVE-2025-68339
In the Linux kernel, the following vulnerability has been resolved:
atm/fore200e: Fix possible data race in fore200e_open()
Protect access to fore200e->available_cell_rate with rate_mtx lock in the error handling path of fore200e_open() to prevent a data race.
The field fore200e->available_cell_rate is a shared resource used to track available bandwidth. It is concurrently accessed by fore200e_open(), fore200e_close(), and fore200e_change_qos().
In fore200e_open(), the lock rate_mtx is correctly held when subtracting vcc->qos.txtp.max_pcr from available_cell_rate to reserve bandwidth. However, if the subsequent call to fore200e_activate_vcin() fails, the function restores the reserved bandwidth by adding back to available_cell_rate without holding the lock.
Leer descripción completaMostrar menos
This introduces a race condition because available_cell_rate is a global device resource shared across all VCCs. If the error path in fore200e_open() executes concurrently with operations like fore200e_close() or fore200e_change_qos() on other VCCs, a read-modify-write race occurs.
Specifically, the error path reads the rate without the lock. If another CPU acquires the lock and modifies the rate (e.g., releasing bandwidth in fore200e_close()) between this read and the subsequent write, the error path will overwrite the concurrent update with a stale value. This results in incorrect bandwidth accounting.
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: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- Fecha de la puntuación: 5/10/2026
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/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d
- https://git.kernel.org/stable/c/6610361458e7eb6502dd3182f586f91fcc218039
- https://git.kernel.org/stable/c/667ac868823224374f819500adc5baa2889c7bc5
- https://git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff
- https://git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167
- https://git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd
- https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-68339",
"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",
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"status": "affected",
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{
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"programFiles": [
"drivers/atm/fore200e.c"
],
"defaultStatus": "unaffected"
},
{
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"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "2.6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.197",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.119",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.61",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.11",
"versionType": "semver",
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},
{
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"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
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"defaultStatus": "affected"
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]
}
],
"published": "2025-12-23T14:16:40.477",
"references": [
{
"url": "https://git.kernel.org/stable/c/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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{
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{
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{
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{
"url": "https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm/fore200e: Fix possible data race in fore200e_open()\n\nProtect access to fore200e->available_cell_rate with rate_mtx lock in the\nerror handling path of fore200e_open() to prevent a data race.\n\nThe field fore200e->available_cell_rate is a shared resource used to track\navailable bandwidth. It is concurrently accessed by fore200e_open(),\nfore200e_close(), and fore200e_change_qos().\n\nIn fore200e_open(), the lock rate_mtx is correctly held when subtracting\nvcc->qos.txtp.max_pcr from available_cell_rate to reserve bandwidth.\nHowever, if the subsequent call to fore200e_activate_vcin() fails, the\nfunction restores the reserved bandwidth by adding back to\navailable_cell_rate without holding the lock.\n\nThis introduces a race condition because available_cell_rate is a global\ndevice resource shared across all VCCs. If the error path in\nfore200e_open() executes concurrently with operations like\nfore200e_close() or fore200e_change_qos() on other VCCs, a\nread-modify-write race occurs.\n\nSpecifically, the error path reads the rate without the lock. If another\nCPU acquires the lock and modifies the rate (e.g., releasing bandwidth in\nfore200e_close()) between this read and the subsequent write, the error\npath will overwrite the concurrent update with a stale value. This results\nin incorrect bandwidth accounting."
}
],
"lastModified": "2026-06-17T09:58:57.840",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}