CVE-2023-53198
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
raw: Fix NULL deref in raw_get_next().
Dae R. Jeong reported a NULL deref in raw_get_next() [0].
It seems that the repro was running these sequences in parallel so that one thread was iterating on a socket that was being freed in another netns.
After commit 0daf07e52709 ("raw: convert raw sockets to RCU"), we use RCU and hlist_nulls_for_each_entry() to iterate over SOCK_RAW sockets. However, we should use spinlock for slow paths to avoid the NULL deref.
Also, SOCK_RAW does not use SLAB_TYPESAFE_BY_RCU, and the slab object is not reused during iteration in the grace period. In fact, the lockless readers do not check the nulls marker with get_nulls_value(). So, SOCK_RAW should use hlist instead of hlist_nulls.
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Instead of adding an unnecessary barrier by sk_nulls_for_each_rcu(), let's convert hlist_nulls to hlist and use sk_for_each_rcu() for fast paths and sk_for_each() and spinlock for /proc/net/raw.
Detalles técnicos trazas, registros y código del informe original
unshare(0x40060200) r0 = syz_open_procfs(0x0, &(0x7f0000002080)='net/raw\x00') socket$inet_icmp_raw(0x2, 0x3, 0x1) pread64(r0, &(0x7f0000000000)=""/10, 0xa, 0x10000000007f) [0]: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 2 PID: 20952 Comm: syz-executor.0 Not tainted 6.2.0-g048ec869bafd-dirty #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:read_pnet include/net/net_namespace.h:383 [inline] RIP: 0010:sock_net include/net/sock.h:649 [inline] RIP: 0010:raw_get_next net/ipv4/raw.c:974 [inline] RIP: 0010:raw_get_idx net/ipv4/raw.c:986 [inline] RIP: 0010:raw_seq_start+0x431/0x800 net/ipv4/raw.c:995 Code: ef e8 33 3d 94 f7 49 8b 6d 00 4c 89 ef e8 b7 65 5f f7 49 89 ed 49 83 c5 98 0f 84 9a 00 00 00 48 83 c5 c8 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 00 3d 94 f7 4c 8b 7d 00 48 89 ef RSP: 0018:ffffc9001154f9b0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 1ffff1100302c8fd RCX: 0000000000000000 RDX: 0000000000000028 RSI: ffffc9001154f988 RDI: ffffc9000f77a338 RBP: 0000000000000029 R08: ffffffff8a50ffb4 R09: fffffbfff24b6bd9 R10: fffffbfff24b6bd9 R11: 0000000000000000 R12: ffff88801db73b78 R13: fffffffffffffff9 R14: dffffc0000000000 R15: 0000000000000030 FS: 00007f843ae8e700(0000) GS:ffff888063700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bb9614b35f CR3: 000000003c672000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> seq_read_iter+0x4c6/0x10f0 fs/seq_file.c:225 seq_read+0x224/0x320 fs/seq_file.c:162 pde_read fs/proc/inode.c:316 [inline] proc_reg_read+0x23f/0x330 fs/proc/inode.c:328 vfs_read+0x31e/0xd30 fs/read_write.c:468 ksys_pread64 fs/read_write.c:665 [inline] __do_sys_pread64 fs/read_write.c:675 [inline] __se_sys_pread64 fs/read_write.c:672 [inline] __x64_sys_pread64+0x1e9/0x280 fs/read_write.c:672 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x478d29 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f843ae8dbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 0000000000791408 RCX: 0000000000478d29 RDX: 000000000000000a RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000f477909a R08: 0000000000000000 R09: 0000000000000000 R10: 000010000000007f R11: 0000000000000246 R12: 0000000000791740 R13: 0000000000791414 R14: 0000000000791408 R15: 00007ffc2eb48a50 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010 ---truncated---
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: 0.16%
- Percentil entre todas las CVEs puntuadas: 4
- 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
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-53198",
"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",
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"version": "648067dd541591a0ddaa31afaaf4a7655d33c0d8",
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{
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"programFiles": [
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"net/ipv4/raw_diag.c",
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],
"defaultStatus": "unaffected"
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{
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"vendor": "Linux",
"product": "Linux",
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"net/ipv4/raw.c",
"net/ipv4/raw_diag.c",
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}
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}
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"published": "2025-09-15T14:15:42.223",
"references": [
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"weaknesses": [
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"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
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"descriptions": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nraw: Fix NULL deref in raw_get_next().\n\nDae R. Jeong reported a NULL deref in raw_get_next() [0].\n\nIt seems that the repro was running these sequences in parallel so\nthat one thread was iterating on a socket that was being freed in\nanother netns.\n\n unshare(0x40060200)\n r0 = syz_open_procfs(0x0, &(0x7f0000002080)='net/raw\\x00')\n socket$inet_icmp_raw(0x2, 0x3, 0x1)\n pread64(r0, &(0x7f0000000000)=\"\"/10, 0xa, 0x10000000007f)\n\nAfter commit 0daf07e52709 (\"raw: convert raw sockets to RCU\"), we\nuse RCU and hlist_nulls_for_each_entry() to iterate over SOCK_RAW\nsockets. However, we should use spinlock for slow paths to avoid\nthe NULL deref.\n\nAlso, SOCK_RAW does not use SLAB_TYPESAFE_BY_RCU, and the slab object\nis not reused during iteration in the grace period. In fact, the\nlockless readers do not check the nulls marker with get_nulls_value().\nSo, SOCK_RAW should use hlist instead of hlist_nulls.\n\nInstead of adding an unnecessary barrier by sk_nulls_for_each_rcu(),\nlet's convert hlist_nulls to hlist and use sk_for_each_rcu() for\nfast paths and sk_for_each() and spinlock for /proc/net/raw.\n\n[0]:\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\nCPU: 2 PID: 20952 Comm: syz-executor.0 Not tainted 6.2.0-g048ec869bafd-dirty #7\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\nRIP: 0010:read_pnet include/net/net_namespace.h:383 [inline]\nRIP: 0010:sock_net include/net/sock.h:649 [inline]\nRIP: 0010:raw_get_next net/ipv4/raw.c:974 [inline]\nRIP: 0010:raw_get_idx net/ipv4/raw.c:986 [inline]\nRIP: 0010:raw_seq_start+0x431/0x800 net/ipv4/raw.c:995\nCode: ef e8 33 3d 94 f7 49 8b 6d 00 4c 89 ef e8 b7 65 5f f7 49 89 ed 49 83 c5 98 0f 84 9a 00 00 00 48 83 c5 c8 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 00 3d 94 f7 4c 8b 7d 00 48 89 ef\nRSP: 0018:ffffc9001154f9b0 EFLAGS: 00010206\nRAX: 0000000000000005 RBX: 1ffff1100302c8fd RCX: 0000000000000000\nRDX: 0000000000000028 RSI: ffffc9001154f988 RDI: ffffc9000f77a338\nRBP: 0000000000000029 R08: ffffffff8a50ffb4 R09: fffffbfff24b6bd9\nR10: fffffbfff24b6bd9 R11: 0000000000000000 R12: ffff88801db73b78\nR13: fffffffffffffff9 R14: dffffc0000000000 R15: 0000000000000030\nFS: 00007f843ae8e700(0000) GS:ffff888063700000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000055bb9614b35f CR3: 000000003c672000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n seq_read_iter+0x4c6/0x10f0 fs/seq_file.c:225\n seq_read+0x224/0x320 fs/seq_file.c:162\n pde_read fs/proc/inode.c:316 [inline]\n proc_reg_read+0x23f/0x330 fs/proc/inode.c:328\n vfs_read+0x31e/0xd30 fs/read_write.c:468\n ksys_pread64 fs/read_write.c:665 [inline]\n __do_sys_pread64 fs/read_write.c:675 [inline]\n __se_sys_pread64 fs/read_write.c:672 [inline]\n __x64_sys_pread64+0x1e9/0x280 fs/read_write.c:672\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x478d29\nCode: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 bc ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f843ae8dbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011\nRAX: ffffffffffffffda RBX: 0000000000791408 RCX: 0000000000478d29\nRDX: 000000000000000a RSI: 0000000020000000 RDI: 0000000000000003\nRBP: 00000000f477909a R08: 0000000000000000 R09: 0000000000000000\nR10: 000010000000007f R11: 0000000000000246 R12: 0000000000791740\nR13: 0000000000791414 R14: 0000000000791408 R15: 00007ffc2eb48a50\n </TASK>\nModules linked in:\n---[ end trace 0000000000000000 ]---\nRIP: 0010\n---truncated---"
}
],
"lastModified": "2026-06-17T06:44:29.250",
"configurations": [
{
"nodes": [
{
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