CVE-2021-47300— 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，该漏洞源于内存释放后重用。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ebf7d1f508a73871acf3b2bfbfa1323a477acdb3< 39f1735c8107ef43a53c4daf82f330d880488d8f |
affected |
ebf7d1f508a73871acf3b2bfbfa1323a477acdb3< cbb086074dab631ac43f8645cbac1d7b148e05c4 |
affected | ||
ebf7d1f508a73871acf3b2bfbfa1323a477acdb3< 5dd0a6b8582ffbfa88351949d50eccd5b6694ade |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
5.10.54≤ 5.10.* |
unaffected | ||
5.13.6≤ 5.13.* |
unaffected | ||
5.14≤ * |
unaffected |
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一、 漏洞 CVE-2021-47300 基础信息
漏洞信息
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Vulnerability Title
bpf: Fix tail_call_reachable rejection for interpreter when jit failed
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix tail_call_reachable rejection for interpreter when jit failed
During testing of f263a81451c1 ("bpf: Track subprog poke descriptors correctly
and fix use-after-free") under various failure conditions, for example, when
jit_subprogs() fails and tries to clean up the program to be run under the
interpreter, we ran into the following freeze:
[...]
#127/8 tailcall_bpf2bpf_3:FAIL
[...]
[ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20
[ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682
[ 92.043707]
[ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87
[ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
[ 92.046785] Call Trace:
[ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0
[ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.049019] ? ktime_get+0x117/0x130
[...] // few hundred [similar] lines more
[ 92.659025] ? ktime_get+0x117/0x130
[ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0
[ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.662378] ? print_usage_bug+0x50/0x50
[ 92.663221] ? print_usage_bug+0x50/0x50
[ 92.664077] ? bpf_ksym_find+0x9c/0xe0
[ 92.664887] ? ktime_get+0x117/0x130
[ 92.665624] ? kernel_text_address+0xf5/0x100
[ 92.666529] ? __kernel_text_address+0xe/0x30
[ 92.667725] ? unwind_get_return_address+0x2f/0x50
[ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20
[ 92.670185] ? ktime_get+0x117/0x130
[ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0
[ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0
[ 92.675159] ? ktime_get+0x117/0x130
[ 92.677074] ? lock_is_held_type+0xd5/0x130
[ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20
[ 92.680046] ? ktime_get+0x117/0x130
[ 92.681285] ? __bpf_prog_run32+0x6b/0x90
[ 92.682601] ? __bpf_prog_run64+0x90/0x90
[ 92.683636] ? lock_downgrade+0x370/0x370
[ 92.684647] ? mark_held_locks+0x44/0x90
[ 92.685652] ? ktime_get+0x117/0x130
[ 92.686752] ? lockdep_hardirqs_on+0x79/0x100
[ 92.688004] ? ktime_get+0x117/0x130
[ 92.688573] ? __cant_migrate+0x2b/0x80
[ 92.689192] ? bpf_test_run+0x2f4/0x510
[ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0
[ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90
[ 92.691506] ? __kasan_slab_alloc+0x61/0x80
[ 92.692128] ? eth_type_trans+0x128/0x240
[ 92.692737] ? __build_skb+0x46/0x50
[ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50
[ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0
[ 92.694639] ? __fget_light+0xa1/0x100
[ 92.695162] ? bpf_prog_inc+0x23/0x30
[ 92.695685] ? __sys_bpf+0xb40/0x2c80
[ 92.696324] ? bpf_link_get_from_fd+0x90/0x90
[ 92.697150] ? mark_held_locks+0x24/0x90
[ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220
[ 92.699045] ? finish_task_switch+0xe6/0x370
[ 92.700072] ? lockdep_hardirqs_on+0x79/0x100
[ 92.701233] ? finish_task_switch+0x11d/0x370
[ 92.702264] ? __switch_to+0x2c0/0x740
[ 92.703148] ? mark_held_locks+0x24/0x90
[ 92.704155] ? __x64_sys_bpf+0x45/0x50
[ 92.705146] ? do_syscall_64+0x35/0x80
[ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae
[...]
Turns out that the program rejection from e411901c0b77 ("bpf: allow for tailcalls
in BPF subprograms for x64 JIT") is buggy since env->prog->aux->tail_call_reachable
is never true. Commit ebf7d1f508a7 ("bpf, x64: rework pro/epilogue and tailcall
handling in JIT") added a tracker into check_max_stack_depth() which propagates
the tail_call_reachable condition throughout the subprograms. This info is then
assigned to the subprogram's
---truncated---
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于内存释放后重用。
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-2021-47300 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-47300 其他参考 (2)
同批安全公告 · Linux · 2024-05-21 · 共 361 条
| CVE-2023-52732 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-52755 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47378 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47328 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47232 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-52741 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47427 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47308 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52776 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52801 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52798 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47388 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47390 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52846 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52769 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52790 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47240 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52829 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47352 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52775 | 8.2 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 361 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47300
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