CVE-2024-44935— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在reuseport_add_sock函数中存在空指针取消引用问题。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6ba84574026792ce33a40c7da721dea36d0f3973< c9b3fc4f157867e858734e31022ebee8a24f0de7 |
affected |
6ba84574026792ce33a40c7da721dea36d0f3973< 52319d9d2f522ed939af31af70f8c3a0f0f67e6c |
affected | ||
6ba84574026792ce33a40c7da721dea36d0f3973< 54b303d8f9702b8ab618c5032fae886b16356928 |
affected | ||
6ba84574026792ce33a40c7da721dea36d0f3973< 05e4a0fa248240efd99a539853e844f0f0a9e6a5 |
affected | ||
6ba84574026792ce33a40c7da721dea36d0f3973< 1407be30fc17eff918a98e0a990c0e988f11dc84 |
affected | ||
6ba84574026792ce33a40c7da721dea36d0f3973< e809a84c802377ef61525a298a1ec1728759b913 |
affected | ||
6ba84574026792ce33a40c7da721dea36d0f3973< 9ab0faa7f9ffe31296dbb9bbe6f76c72c14eea18 |
affected | ||
5.0 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2024-44935 基础信息
漏洞信息
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Vulnerability Title
sctp: Fix null-ptr-deref in reuseport_add_sock().
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sctp: Fix null-ptr-deref in reuseport_add_sock().
syzbot reported a null-ptr-deref while accessing sk2->sk_reuseport_cb in
reuseport_add_sock(). [0]
The repro first creates a listener with SO_REUSEPORT. Then, it creates
another listener on the same port and concurrently closes the first
listener.
The second listen() calls reuseport_add_sock() with the first listener as
sk2, where sk2->sk_reuseport_cb is not expected to be cleared concurrently,
but the close() does clear it by reuseport_detach_sock().
The problem is SCTP does not properly synchronise reuseport_alloc(),
reuseport_add_sock(), and reuseport_detach_sock().
The caller of reuseport_alloc() and reuseport_{add,detach}_sock() must
provide synchronisation for sockets that are classified into the same
reuseport group.
Otherwise, such sockets form multiple identical reuseport groups, and
all groups except one would be silently dead.
1. Two sockets call listen() concurrently
2. No socket in the same group found in sctp_ep_hashtable[]
3. Two sockets call reuseport_alloc() and form two reuseport groups
4. Only one group hit first in __sctp_rcv_lookup_endpoint() receives
incoming packets
Also, the reported null-ptr-deref could occur.
TCP/UDP guarantees that would not happen by holding the hash bucket lock.
Let's apply the locking strategy to __sctp_hash_endpoint() and
__sctp_unhash_endpoint().
[0]:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 UID: 0 PID: 10230 Comm: syz-executor119 Not tainted 6.10.0-syzkaller-12585-g301927d2d2eb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/sock_reuseport.c:350
Code: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14
RSP: 0018:ffffc9000b947c98 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff8880252ddf98 RCX: ffff888079478000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000012
RBP: 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385
R10: dffffc0000000000 R11: fffffbfff1fef386 R12: ffff8880252ddac0
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__sctp_hash_endpoint net/sctp/input.c:762 [inline]
sctp_hash_endpoint+0x52a/0x600 net/sctp/input.c:790
sctp_listen_start net/sctp/socket.c:8570 [inline]
sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625
__sys_listen_socket net/socket.c:1883 [inline]
__sys_listen+0x1b7/0x230 net/socket.c:1894
__do_sys_listen net/socket.c:1902 [inline]
__se_sys_listen net/socket.c:1900 [inline]
__x64_sys_listen+0x5a/0x70 net/socket.c:1900
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24e46039b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 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:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
RAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: 00007f24e46039b9
RDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007f24e468e420 R08: 00007f24e45b96c0 R09: 00007f24e45b96c0
R10: 00007f24e45b96c0 R11: 0000000000000246 R12: 00007f24e468e42c
R13:
---truncated---
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在reuseport_add_sock函数中存在空指针取消引用问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-44935 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-44935 其他参考 (7)
同批安全公告 · Linux · 2024-08-26 · 共 39 条
| CVE-2024-44942 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43910 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44934 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43897 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43892 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43891 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43888 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44941 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44940 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44933 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43913 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-44938 | Linux kernel 安全漏洞 | |
| CVE-2024-44937 | Linux kernel 安全漏洞 | |
| CVE-2024-44936 | Linux kernel 安全漏洞 | |
| CVE-2024-44932 | Linux kernel 安全漏洞 | |
| CVE-2024-44931 | Linux kernel 安全漏洞 | |
| CVE-2024-43914 | Linux kernel 安全漏洞 | |
| CVE-2024-43912 | Linux kernel 安全漏洞 | |
| CVE-2024-43911 | Linux kernel 安全漏洞 |
显示前 20 条，共 39 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-44935
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