CVE-2026-43319
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
spi: spidev: fix lock inversion between spi_lock and buf_lock
The spidev driver previously used two mutexes, spi_lock and buf_lock, but acquired them in different orders depending on the code path:
This AB-BA locking pattern triggers lockdep warnings and can cause real deadlocks:
The issue is reproducible with a simple userspace program that performs write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from separate threads on the same spidev file descriptor.
Fix this by simplifying the locking model and removing the lock inversion entirely. spidev_sync() no longer performs any locking, and all callers serialize access using spi_lock.
Leer descripción completaMostrar menos
buf_lock is removed since its functionality is fully covered by spi_lock, eliminating the possibility of lock ordering issues.
This removes the lock inversion and prevents deadlocks without changing userspace ABI or behaviour.
Detalles técnicos trazas, registros y código del informe original
write()/read(): buf_lock -> spi_lock ioctl(): spi_lock -> buf_lock WARNING: possible circular locking dependency detected spidev_ioctl() -> mutex_lock(&spidev->buf_lock) spidev_sync_write() -> mutex_lock(&spidev->spi_lock) *** DEADLOCK ***
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- 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)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/40534d19ed2afb880ecf202dab26a8e7a5808d16
- https://git.kernel.org/stable/c/41ccfac7d302968a4f32b5f7b012d066c5f5cdf8
- https://git.kernel.org/stable/c/e341e18215030af2136836b78508e0d798916df7
- https://git.kernel.org/stable/c/f8431b8672231d378b03176fe74c95adfd3522cf
- https://git.kernel.org/stable/c/fabfed1afe273717ea33b8aee46b767360edbb80
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-43319",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
]
},
"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": "a720416d94634068951773cb9e9d6f1b73769e5b",
"lessThan": "fabfed1afe273717ea33b8aee46b767360edbb80",
"versionType": "git"
},
{
"status": "affected",
"version": "a720416d94634068951773cb9e9d6f1b73769e5b",
"lessThan": "f8431b8672231d378b03176fe74c95adfd3522cf",
"versionType": "git"
},
{
"status": "affected",
"version": "a720416d94634068951773cb9e9d6f1b73769e5b",
"lessThan": "e341e18215030af2136836b78508e0d798916df7",
"versionType": "git"
},
{
"status": "affected",
"version": "a720416d94634068951773cb9e9d6f1b73769e5b",
"lessThan": "41ccfac7d302968a4f32b5f7b012d066c5f5cdf8",
"versionType": "git"
},
{
"status": "affected",
"version": "a720416d94634068951773cb9e9d6f1b73769e5b",
"lessThan": "40534d19ed2afb880ecf202dab26a8e7a5808d16",
"versionType": "git"
}
],
"programFiles": [
"drivers/spi/spidev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/spi/spidev.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-05-08T14:16:40.480",
"references": [
{
"url": "https://git.kernel.org/stable/c/40534d19ed2afb880ecf202dab26a8e7a5808d16",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/41ccfac7d302968a4f32b5f7b012d066c5f5cdf8",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e341e18215030af2136836b78508e0d798916df7",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f8431b8672231d378b03176fe74c95adfd3522cf",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fabfed1afe273717ea33b8aee46b767360edbb80",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-667"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: spidev: fix lock inversion between spi_lock and buf_lock\n\nThe spidev driver previously used two mutexes, spi_lock and buf_lock,\nbut acquired them in different orders depending on the code path:\n\n write()/read(): buf_lock -> spi_lock\n ioctl(): spi_lock -> buf_lock\n\nThis AB-BA locking pattern triggers lockdep warnings and can\ncause real deadlocks:\n\n WARNING: possible circular locking dependency detected\n spidev_ioctl() -> mutex_lock(&spidev->buf_lock)\n spidev_sync_write() -> mutex_lock(&spidev->spi_lock)\n *** DEADLOCK ***\n\nThe issue is reproducible with a simple userspace program that\nperforms write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from\nseparate threads on the same spidev file descriptor.\n\nFix this by simplifying the locking model and removing the lock\ninversion entirely. spidev_sync() no longer performs any locking,\nand all callers serialize access using spi_lock.\n\nbuf_lock is removed since its functionality is fully covered by\nspi_lock, eliminating the possibility of lock ordering issues.\n\nThis removes the lock inversion and prevents deadlocks without\nchanging userspace ABI or behaviour."
}
],
"lastModified": "2026-06-17T10:49:22.467",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "962DD04D-AFB4-4916-A3EC-C09D8519676D",
"versionEndExcluding": "6.12.75",
"versionStartIncluding": "6.2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
"versionEndExcluding": "6.18.16",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
"versionEndExcluding": "6.19.6",
"versionStartIncluding": "6.19"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}