中危 CVE-2022-48847

CVE编号

CVE-2022-48847

利用情况

暂无

补丁情况

官方补丁

披露时间

2024-07-16
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:

watch_queue: Fix filter limit check

In watch_queue_set_filter(), there are a couple of places where we check
that the filter type value does not exceed what the type_filter bitmap
can hold. One place calculates the number of bits by:

if (tf[i].type >= sizeof(wfilter->type_filter) * 8)

which is fine, but the second does:

if (tf[i].type >= sizeof(wfilter->type_filter) * BITS_PER_LONG)

which is not. This can lead to a couple of out-of-bounds writes due to
a too-large type:

(1) __set_bit() on wfilter->type_filter
(2) Writing more elements in wfilter->filters[] than we allocated.

Fix this by just using the proper WATCH_TYPE__NR instead, which is the
number of types we actually know about.

The bug may cause an oops looking something like:

BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x659/0x740
Write of size 4 at addr ffff88800d2c66bc by task watch_queue_oob/611
...
Call Trace:
<TASK>
dump_stack_lvl+0x45/0x59
print_address_description.constprop.0+0x1f/0x150
...
kasan_report.cold+0x7f/0x11b
...
watch_queue_set_filter+0x659/0x740
...
__x64_sys_ioctl+0x127/0x190
do_syscall_64+0x43/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae

Allocated by task 611:
kasan_save_stack+0x1e/0x40
__kasan_kmalloc+0x81/0xa0
watch_queue_set_filter+0x23a/0x740
__x64_sys_ioctl+0x127/0x190
do_syscall_64+0x43/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88800d2c66a0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes inside of
32-byte region [ffff88800d2c66a0, ffff88800d2c66c0)
解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接
https://access.redhat.com/security/cve/CVE-2022-48847
https://git.kernel.org/stable/c/1b09f28f70a5046acd64138075ae3f095238b045
https://git.kernel.org/stable/c/648895da69ced90ca770fd941c3d9479a9d72c16
https://git.kernel.org/stable/c/b36588ebbcef74583824c08352e75838d6fb4ff2
https://git.kernel.org/stable/c/c993ee0f9f81caf5767a50d1faeba39a0dc82af2
https://lore.kernel.org/linux-cve-announce/2024071624-CVE-2022-48847-42ea@gregkh/T
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_11 linux * Up to
(excluding)
5.10.106-1
运行在以下环境
系统 debian_12 linux * Up to
(excluding)
5.16.18-1
运行在以下环境
系统 linux linux_kernel * From
(including)
5.11 		Up to
(excluding)
5.15.29
运行在以下环境
系统 linux linux_kernel * From
(including)
5.16 		Up to
(excluding)
5.16.15
运行在以下环境
系统 linux linux_kernel * From
(including)
5.8 		Up to
(excluding)
5.10.106
阿里云评分
5.0
  • 攻击路径
    本地
  • 攻击复杂度
    困难
  • 权限要求
    管控权限
  • 影响范围
    有限影响
  • EXP成熟度
    未验证
  • 补丁情况
    官方补丁
  • 数据保密性
    无影响
  • 数据完整性
    无影响
  • 服务器危害
    无影响
  • 全网数量
    N/A
CWE-ID 漏洞类型
CWE-787 跨界内存写
阿里云安全产品覆盖情况