CVE-2025-39828
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
atm: atmtcp: Prevent arbitrary write in atmtcp_recv_control().
syzbot reported the splat below. [0]
When atmtcp_v_open() or atmtcp_v_close() is called via connect() or close(), atmtcp_send_control() is called to send an in-kernel special message.
The message has ATMTCP_HDR_MAGIC in atmtcp_control.hdr.length. Also, a pointer of struct atm_vcc is set to atmtcp_control.vcc.
The notable thing is struct atmtcp_control is uAPI but has a space for an in-kernel pointer.
The special message is processed in atmtcp_recv_control() called from atmtcp_c_send().
Leer descripción completaMostrar menos
atmtcp_c_send() is vcc->dev->ops->send() and called from 2 paths:
The problem is sendmsg() does not validate the message length and userspace can abuse atmtcp_recv_control() to overwrite any kptr by atmtcp_control.
Let's add a new ->pre_send() hook to validate messages from sendmsg().
Detalles técnicos trazas, registros y código del informe original
struct atmtcp_control {
struct atmtcp_hdr hdr; /* must be first */
...
atm_kptr_t vcc; /* both directions */
...
} __ATM_API_ALIGN;
typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
1. .ndo_start_xmit() (vcc->send() == atm_send_aal0())
2. vcc_sendmsg()
[0]:
Oops: general protection fault, probably for non-canonical address 0xdffffc00200000ab: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000100000558-0x000000010000055f]
CPU: 0 UID: 0 PID: 5865 Comm: syz-executor331 Not tainted 6.17.0-rc1-syzkaller-00215-gbab3ce404553 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:atmtcp_recv_control drivers/atm/atmtcp.c:93 [inline]
RIP: 0010:atmtcp_c_send+0x1da/0x950 drivers/atm/atmtcp.c:297
Code: 4d 8d 75 1a 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 15 06 00 00 41 0f b7 1e 4d 8d b7 60 05 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 13 06 00 00 66 41 89 1e 4d 8d 75 1c 4c
RSP: 0018:ffffc90003f5f810 EFLAGS: 00010203
RAX: 00000000200000ab RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802a510000 RSI: 00000000ffffffff RDI: ffff888030a6068c
RBP: ffff88802699fb40 R08: ffff888030a606eb R09: 1ffff1100614c0dd
R10: dffffc0000000000 R11: ffffffff8718fc40 R12: dffffc0000000000
R13: ffff888030a60680 R14: 000000010000055f R15: 00000000ffffffff
FS: 00007f8d7e9236c0(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ad50 CR3: 0000000075bde000 CR4: 00000000003526f0
Call Trace:
<TASK>
vcc_sendmsg+0xa10/0xc60 net/atm/common.c:645
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d7e96a4a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8d7e923198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8d7e9f4308 RCX: 00007f8d7e96a4a9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007f8d7e9f4300 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f8d7e9c10ac
R13: 00007f8d7e9231a0 R14: 0000200000000200 R15: 0000200000000250
</TASK>
Modules linked in:CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
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: 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation90 % - Impacto principal
T1565.001Stored Data Manipulationimpact85 % - Impacto secundario
T1499.004Application or System Exploitationimpact60 %
Vulnerabilidad local (AV:L, PR:L) que permite escritura arbitraria en memoria del kernel. El vector CVSS sin UI:N y acceso local con privilegios confirma T1068. Impactos: modificación de datos del kernel (T1565.001) y potencial DoS (T1499.004) por corrupción de memoria.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (2)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0a6a6d4fb333f7afe22e59ffed18511a7a98efc8
- https://git.kernel.org/stable/c/33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b
- https://git.kernel.org/stable/c/3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe
- https://git.kernel.org/stable/c/3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b
- https://git.kernel.org/stable/c/51872b26429077be611b0a1816e0e722278015c3
- https://git.kernel.org/stable/c/62f368472b0aa4b5d91d9b983152855c6b6d8925
- https://git.kernel.org/stable/c/b502f16bad8f0a4cfbd023452766f21bfda39dde
- https://git.kernel.org/stable/c/ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-39828",
"cveTags": [],
"metrics": {
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{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
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"versionType": "git"
},
{
"status": "affected",
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"versionType": "git"
},
{
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}
],
"programFiles": [
"drivers/atm/atmtcp.c",
"include/linux/atmdev.h",
"net/atm/common.c"
],
"defaultStatus": "unaffected"
},
{
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"vendor": "Linux",
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"versions": [
{
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},
{
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"version": "0",
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},
{
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},
{
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"versionType": "semver",
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},
{
"status": "unaffected",
"version": "5.15.191",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.150",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.104",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.45",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.5",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/atm/atmtcp.c",
"include/linux/atmdev.h",
"net/atm/common.c"
],
"defaultStatus": "affected"
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC CN 4100",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V5.0",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2025-09-16T13:16:03.373",
"references": [
{
"url": "https://git.kernel.org/stable/c/0a6a6d4fb333f7afe22e59ffed18511a7a98efc8",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/51872b26429077be611b0a1816e0e722278015c3",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/62f368472b0aa4b5d91d9b983152855c6b6d8925",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b502f16bad8f0a4cfbd023452766f21bfda39dde",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: atmtcp: Prevent arbitrary write in atmtcp_recv_control().\n\nsyzbot reported the splat below. [0]\n\nWhen atmtcp_v_open() or atmtcp_v_close() is called via connect()\nor close(), atmtcp_send_control() is called to send an in-kernel\nspecial message.\n\nThe message has ATMTCP_HDR_MAGIC in atmtcp_control.hdr.length.\nAlso, a pointer of struct atm_vcc is set to atmtcp_control.vcc.\n\nThe notable thing is struct atmtcp_control is uAPI but has a\nspace for an in-kernel pointer.\n\n struct atmtcp_control {\n \tstruct atmtcp_hdr hdr;\t/* must be first */\n ...\n \tatm_kptr_t vcc;\t\t/* both directions */\n ...\n } __ATM_API_ALIGN;\n\n typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;\n\nThe special message is processed in atmtcp_recv_control() called\nfrom atmtcp_c_send().\n\natmtcp_c_send() is vcc->dev->ops->send() and called from 2 paths:\n\n 1. .ndo_start_xmit() (vcc->send() == atm_send_aal0())\n 2. vcc_sendmsg()\n\nThe problem is sendmsg() does not validate the message length and\nuserspace can abuse atmtcp_recv_control() to overwrite any kptr\nby atmtcp_control.\n\nLet's add a new ->pre_send() hook to validate messages from sendmsg().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc00200000ab: 0000 [#1] SMP KASAN PTI\nKASAN: probably user-memory-access in range [0x0000000100000558-0x000000010000055f]\nCPU: 0 UID: 0 PID: 5865 Comm: syz-executor331 Not tainted 6.17.0-rc1-syzkaller-00215-gbab3ce404553 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\nRIP: 0010:atmtcp_recv_control drivers/atm/atmtcp.c:93 [inline]\nRIP: 0010:atmtcp_c_send+0x1da/0x950 drivers/atm/atmtcp.c:297\nCode: 4d 8d 75 1a 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 15 06 00 00 41 0f b7 1e 4d 8d b7 60 05 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 13 06 00 00 66 41 89 1e 4d 8d 75 1c 4c\nRSP: 0018:ffffc90003f5f810 EFLAGS: 00010203\nRAX: 00000000200000ab RBX: 0000000000000000 RCX: 0000000000000000\nRDX: ffff88802a510000 RSI: 00000000ffffffff RDI: ffff888030a6068c\nRBP: ffff88802699fb40 R08: ffff888030a606eb R09: 1ffff1100614c0dd\nR10: dffffc0000000000 R11: ffffffff8718fc40 R12: dffffc0000000000\nR13: ffff888030a60680 R14: 000000010000055f R15: 00000000ffffffff\nFS: 00007f8d7e9236c0(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000000045ad50 CR3: 0000000075bde000 CR4: 00000000003526f0\nCall Trace:\n <TASK>\n vcc_sendmsg+0xa10/0xc60 net/atm/common.c:645\n sock_sendmsg_nosec net/socket.c:714 [inline]\n __sock_sendmsg+0x219/0x270 net/socket.c:729\n ____sys_sendmsg+0x505/0x830 net/socket.c:2614\n ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668\n __sys_sendmsg net/socket.c:2700 [inline]\n __do_sys_sendmsg net/socket.c:2705 [inline]\n __se_sys_sendmsg net/socket.c:2703 [inline]\n __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f8d7e96a4a9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f8d7e923198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f8d7e9f4308 RCX: 00007f8d7e96a4a9\nRDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000005\nRBP: 00007f8d7e9f4300 R08: 65732f636f72702f R09: 65732f636f72702f\nR10: 65732f636f72702f R11: 0000000000000246 R12: 00007f8d7e9c10ac\nR13: 00007f8d7e9231a0 R14: 0000200000000200 R15: 0000200000000250\n </TASK>\nModules linked in:"
}
],
"lastModified": "2026-06-17T09:18:34.160",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9C88F3D3-DE2F-46B5-ABFB-05ECB718391F",
"versionEndExcluding": "5.4.298",
"versionStartIncluding": "2.6.12.1"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CFAE7D1D-31D7-4259-8581-3CB64D12DE3B",
"versionEndExcluding": "5.10.242",
"versionStartIncluding": "5.5"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A532F1D1-B7A9-4745-AB0E-B6AD12CAD0BD",
"versionEndExcluding": "5.15.191",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "67AC87D5-97BF-4617-92EF-9E282B6D1CF7",
"versionEndExcluding": "6.1.150",
"versionStartIncluding": "5.16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "FD12E3C3-F737-4936-9A57-80832E36D22F",
"versionEndExcluding": "6.6.104",
"versionStartIncluding": "6.2"
},
{
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"vulnerable": true,
"matchCriteriaId": "DC443D7D-A411-41FB-BB45-010F36EF7C94",
"versionEndExcluding": "6.12.45",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "EB781080-7001-4FA1-B388-517FFEFBC73E",
"versionEndExcluding": "6.16.5",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6F62EECE-8FB1-4D57-85D8-CB9E23CF313C"
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