CVE-2026-43216
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: Drop the lock in skb_may_tx_timestamp()
skb_may_tx_timestamp() may acquire sock::sk_callback_lock. The lock must not be taken in IRQ context, only softirq is okay. A few drivers receive the timestamp via a dedicated interrupt and complete the TX timestamp from that handler. This will lead to a deadlock if the lock is already write-locked on the same CPU.
Taking the lock can be avoided. The socket (pointed by the skb) will remain valid until the skb is released.
Leer descripción completaMostrar menos
The ->sk_socket and ->file member will be set to NULL once the user closes the socket which may happen before the timestamp arrives. If we happen to observe the pointer while the socket is closing but before the pointer is set to NULL then we may use it because both pointer (and the file's cred member) are RCU freed.
Drop the lock. Use READ_ONCE() to obtain the individual pointer. Add a matching WRITE_ONCE() where the pointer are cleared.
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: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- 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)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/3709d73ace37e9aaebb688f5a5cf706d74350b64
- https://git.kernel.org/stable/c/4839cbda8f13e99ce2bb3b593f5cc3288415684b
- https://git.kernel.org/stable/c/983512f3a87fd8dc4c94dfa6b596b6e57df5aad7
- https://git.kernel.org/stable/c/c770217044d9cbe16a1f7c385cf080ed06a2fc04
- https://git.kernel.org/stable/c/cd2463ec60f0d6e460078037c86f9d0947ee1ff6
- https://git.kernel.org/stable/c/cf7599116c4c0082fd25cb1bf0254631da0ed06e
- https://git.kernel.org/stable/c/e4c6efb3b70ff87f1df99efce2f8893717695718
- https://git.kernel.org/stable/c/f3e4cceafad27c9363c33622732f86722846ec6f
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-43216",
"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": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "4839cbda8f13e99ce2bb3b593f5cc3288415684b",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "3709d73ace37e9aaebb688f5a5cf706d74350b64",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "cf7599116c4c0082fd25cb1bf0254631da0ed06e",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "cd2463ec60f0d6e460078037c86f9d0947ee1ff6",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "c770217044d9cbe16a1f7c385cf080ed06a2fc04",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "f3e4cceafad27c9363c33622732f86722846ec6f",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "e4c6efb3b70ff87f1df99efce2f8893717695718",
"versionType": "git"
},
{
"status": "affected",
"version": "b245be1f4db1a0394e4b6eb66059814b46670ac3",
"lessThan": "983512f3a87fd8dc4c94dfa6b596b6e57df5aad7",
"versionType": "git"
}
],
"programFiles": [
"include/net/sock.h",
"net/core/skbuff.c",
"net/socket.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"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": [
"include/net/sock.h",
"net/core/skbuff.c",
"net/socket.c"
],
"defaultStatus": "affected"
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2026-05-06T12:16:41.190",
"references": [
{
"url": "https://git.kernel.org/stable/c/3709d73ace37e9aaebb688f5a5cf706d74350b64",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4839cbda8f13e99ce2bb3b593f5cc3288415684b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/983512f3a87fd8dc4c94dfa6b596b6e57df5aad7",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c770217044d9cbe16a1f7c385cf080ed06a2fc04",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cd2463ec60f0d6e460078037c86f9d0947ee1ff6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cf7599116c4c0082fd25cb1bf0254631da0ed06e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e4c6efb3b70ff87f1df99efce2f8893717695718",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f3e4cceafad27c9363c33622732f86722846ec6f",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Drop the lock in skb_may_tx_timestamp()\n\nskb_may_tx_timestamp() may acquire sock::sk_callback_lock. The lock must\nnot be taken in IRQ context, only softirq is okay. A few drivers receive\nthe timestamp via a dedicated interrupt and complete the TX timestamp\nfrom that handler. This will lead to a deadlock if the lock is already\nwrite-locked on the same CPU.\n\nTaking the lock can be avoided. The socket (pointed by the skb) will\nremain valid until the skb is released. The ->sk_socket and ->file\nmember will be set to NULL once the user closes the socket which may\nhappen before the timestamp arrives.\nIf we happen to observe the pointer while the socket is closing but\nbefore the pointer is set to NULL then we may use it because both\npointer (and the file's cred member) are RCU freed.\n\nDrop the lock. Use READ_ONCE() to obtain the individual pointer. Add a\nmatching WRITE_ONCE() where the pointer are cleared."
}
],
"lastModified": "2026-09-08T09:18:03.780",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4CA18AF7-4C43-4631-B934-2D645DEF579E",
"versionEndExcluding": "6.18.16",
"versionStartIncluding": "4.0"
},
{
"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"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}