CVE-2024-49949— 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net组件中qdisc_pkt_len_init函数在处理UFO时的潜在下溢问题。
影响版本矩阵 26
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 960b360ca7463921c1a6b72e7066a706d6406223< d70ca7598943572d5e384227bd268acb5109bf72 |
affected |
fb2dbc124a7f800cd0e4f901a1bbb769a017104c< 1598d70ad9c7d0a4d9d54b82094e9f45908fda6d |
affected | ||
8e6bae950da9dc2d2c6c18b1c6b206dc00dc8772< ba26060a29d3ca1bfc737aa79f7125128f35147c |
affected | ||
0f810d06b507aa40fef8d1ac0a88e6d0590dbfc3< 939c88cbdc668dadd8cfa7a35d9066331239041c |
affected | ||
cf9acc90c80ecbee00334aa85d92f4e74014bcff< d6114993e0a89fde84a60a60a8329a571580b174 |
affected | ||
cf9acc90c80ecbee00334aa85d92f4e74014bcff< 25ab0b87dbd89cecef8a9c60a02bb97832e471d1 |
affected | ||
cf9acc90c80ecbee00334aa85d92f4e74014bcff< f959cce8a2a04ce776aa8b78e83ce339e0d7fbac |
affected | ||
cf9acc90c80ecbee00334aa85d92f4e74014bcff< 81fd007dcd47c34471766249853e4d4bce8eea4b |
affected | ||
| … +18 条更多 | |||
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一、 漏洞 CVE-2024-49949 基础信息
漏洞信息
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Vulnerability Title
net: avoid potential underflow in qdisc_pkt_len_init() with UFO
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: avoid potential underflow in qdisc_pkt_len_init() with UFO
After commit 7c6d2ecbda83 ("net: be more gentle about silly gso
requests coming from user") virtio_net_hdr_to_skb() had sanity check
to detect malicious attempts from user space to cook a bad GSO packet.
Then commit cf9acc90c80ec ("net: virtio_net_hdr_to_skb: count
transport header in UFO") while fixing one issue, allowed user space
to cook a GSO packet with the following characteristic :
IPv4 SKB_GSO_UDP, gso_size=3, skb->len = 28.
When this packet arrives in qdisc_pkt_len_init(), we end up
with hdr_len = 28 (IPv4 header + UDP header), matching skb->len
Then the following sets gso_segs to 0 :
gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
shinfo->gso_size);
Then later we set qdisc_skb_cb(skb)->pkt_len to back to zero :/
qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
This leads to the following crash in fq_codel [1]
qdisc_pkt_len_init() is best effort, we only want an estimation
of the bytes sent on the wire, not crashing the kernel.
This patch is fixing this particular issue, a following one
adds more sanity checks for another potential bug.
[1]
[ 70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 70.724561] #PF: supervisor read access in kernel mode
[ 70.724561] #PF: error_code(0x0000) - not-present page
[ 70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0
[ 70.724561] Oops: Oops: 0000 [#1] SMP NOPTI
[ 70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991
[ 70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel
[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 <49> 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49
All code
========
0: 24 08 and $0x8,%al
2: 49 c1 e1 06 shl $0x6,%r9
6: 44 89 7c 24 18 mov %r15d,0x18(%rsp)
b: 45 31 ed xor %r13d,%r13d
e: 45 31 c0 xor %r8d,%r8d
11: 31 ff xor %edi,%edi
13: 89 44 24 14 mov %eax,0x14(%rsp)
17: 4c 03 8b 90 01 00 00 add 0x190(%rbx),%r9
1e: eb 04 jmp 0x24
20: 39 ca cmp %ecx,%edx
22: 73 37 jae 0x5b
24: 4d 8b 39 mov (%r9),%r15
27: 83 c7 01 add $0x1,%edi
2a:* 49 8b 17 mov (%r15),%rdx <-- trapping instruction
2d: 49 89 11 mov %rdx,(%r9)
30: 41 8b 57 28 mov 0x28(%r15),%edx
34: 45 8b 5f 34 mov 0x34(%r15),%r11d
38: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
3f: 49 rex.WB
Code starting with the faulting instruction
===========================================
0: 49 8b 17 mov (%r15),%rdx
3: 49 89 11 mov %rdx,(%r9)
6: 41 8b 57 28 mov 0x28(%r15),%edx
a: 45 8b 5f 34 mov 0x34(%r15),%r11d
e: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
15: 49 rex.WB
[ 70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202
[ 70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000
[ 70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
[ 70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000
[ 70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58
[ 70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000
[ 70.724561] FS: 000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000
[ 70.724561] CS: 0010 DS: 0000 ES: 0000 C
---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net组件中qdisc_pkt_len_init函数在处理UFO时的潜在下溢问题。
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-2024-49949 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-49949 补丁与修复 (9)
同批安全公告 · Linux · 2024-10-21 · 共 372 条
| CVE-2022-48985 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47695 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50033 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49855 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50043 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50047 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49003 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49996 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47678 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49017 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50029 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48954 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48967 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48964 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48960 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48962 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49015 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49939 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49930 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-49949
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