Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - ext4修复 eh_entries == 0 且 eh_depth > 0 时范围解析中的缺陷。在遍历 inode 范围时ext4_ext_binsearch_idx() 函数假设范围标头之前已进行验证。但是，当 depth > 0 时，没有任何检查验证条目数 (eh->eh_entries) 是否为非零。这将导致出现问题，因为 EXT_FIRST_INDEX() 和 EXT_LAST_INDEX() 将返回垃圾信息，并导致this[ 135.245946] ------------[在此剪切 ]------------ [ 135.247579] fs/ext4/extents.c:2258 的内核缺陷问题[ 135.249045] 无效的 opcode0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] 硬件名称QEMU Standard PC (i440FX + PIIX 、1996、BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP
    0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code[ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS
    00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08:
    0000000000000001 R09ffff888002ca580c [ 135.268576] R100000000000002602 R110000000000000000 R12
    0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS:
    0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace [ 135.278635] <TASK> [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ?
    _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hww此修补程序仅在 __ext4_ext_check() 中添加额外检查当 eh_depth 大于 0 时验证 eh_entries 是否不为 0。
    (CVE-2022-48631)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2022-48631

medium Nessus 插件 ID 225277

版本 1.13