CVE-2025-39828 (GCVE-0-2025-39828)
Vulnerability from cvelistv5
Published
2025-09-16 13:00
Modified
2025-09-16 13:00
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
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;
The special message is processed in atmtcp_recv_control() called
from atmtcp_c_send().
atmtcp_c_send() is vcc->dev->ops->send() and called from 2 paths:
1. .ndo_start_xmit() (vcc->send() == atm_send_aal0())
2. vcc_sendmsg()
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().
[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:
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||||||
|
|||||||||
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"drivers/atm/atmtcp.c",
"include/linux/atmdev.h",
"net/atm/common.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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"versionType": "git"
}
]
},
{
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"include/linux/atmdev.h",
"net/atm/common.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"lessThan": "2.6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.298",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.242",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.150",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc4",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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{
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},
{
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},
{
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},
{
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{
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003edev-\u003eops-\u003esend() and called from 2 paths:\n\n 1. .ndo_start_xmit() (vcc-\u003esend() == 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\u0027s add a new -\u003epre_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 \u003c42\u003e 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 \u003cTASK\u003e\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 \u003c48\u003e 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 \u003c/TASK\u003e\nModules linked in:"
}
],
"providerMetadata": {
"dateUpdated": "2025-09-16T13:00:26.433Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b502f16bad8f0a4cfbd023452766f21bfda39dde"
},
{
"url": "https://git.kernel.org/stable/c/0a6a6d4fb333f7afe22e59ffed18511a7a98efc8"
},
{
"url": "https://git.kernel.org/stable/c/62f368472b0aa4b5d91d9b983152855c6b6d8925"
},
{
"url": "https://git.kernel.org/stable/c/51872b26429077be611b0a1816e0e722278015c3"
},
{
"url": "https://git.kernel.org/stable/c/3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b"
},
{
"url": "https://git.kernel.org/stable/c/33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b"
},
{
"url": "https://git.kernel.org/stable/c/3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe"
},
{
"url": "https://git.kernel.org/stable/c/ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a"
}
],
"title": "atm: atmtcp: Prevent arbitrary write in atmtcp_recv_control().",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39828",
"datePublished": "2025-09-16T13:00:26.433Z",
"dateReserved": "2025-04-16T07:20:57.140Z",
"dateUpdated": "2025-09-16T13:00:26.433Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39828\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T13:16:03.373\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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-\u003edev-\u003eops-\u003esend() and called from 2 paths:\\n\\n 1. .ndo_start_xmit() (vcc-\u003esend() == 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\u0027s add a new -\u003epre_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 \u003c42\u003e 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 \u003cTASK\u003e\\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 \u003c48\u003e 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 \u003c/TASK\u003e\\nModules linked in:\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a6a6d4fb333f7afe22e59ffed18511a7a98efc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51872b26429077be611b0a1816e0e722278015c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/62f368472b0aa4b5d91d9b983152855c6b6d8925\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b502f16bad8f0a4cfbd023452766f21bfda39dde\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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