CVE-2022-50090— 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btrfs文件系统使用固定值BTRFS_MAX_EXTENT_SIZE计算元数据预留量，可能导致元数据耗尽。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d8e3fb106f393858b90b3befc4f6092a76c86d1c< 1aa262c1d056551dd1246115af8b7e351184deae |
affected |
d8e3fb106f393858b90b3befc4f6092a76c86d1c< 6cb4b96df97082a54634ba02196516919cda228c |
affected | ||
d8e3fb106f393858b90b3befc4f6092a76c86d1c< 096e8eb9639b342bc35f9b741cf05e26d0106e92 |
affected | ||
d8e3fb106f393858b90b3befc4f6092a76c86d1c< f7b12a62f008a3041f42f2426983e59a6a0a3c59 |
affected | ||
5.12 |
affected | ||
< 5.12 |
unaffected | ||
5.15.64≤ 5.15.* |
unaffected | ||
5.18.18≤ 5.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2022-50090 基础信息
漏洞信息
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Vulnerability Title
btrfs: replace BTRFS_MAX_EXTENT_SIZE with fs_info->max_extent_size
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: replace BTRFS_MAX_EXTENT_SIZE with fs_info->max_extent_size
On zoned filesystem, data write out is limited by max_zone_append_size,
and a large ordered extent is split according the size of a bio. OTOH,
the number of extents to be written is calculated using
BTRFS_MAX_EXTENT_SIZE, and that estimated number is used to reserve the
metadata bytes to update and/or create the metadata items.
The metadata reservation is done at e.g, btrfs_buffered_write() and then
released according to the estimation changes. Thus, if the number of extent
increases massively, the reserved metadata can run out.
The increase of the number of extents easily occurs on zoned filesystem
if BTRFS_MAX_EXTENT_SIZE > max_zone_append_size. And, it causes the
following warning on a small RAM environment with disabling metadata
over-commit (in the following patch).
[75721.498492] ------------[ cut here ]------------
[75721.505624] BTRFS: block rsv 1 returned -28
[75721.512230] WARNING: CPU: 24 PID: 2327559 at fs/btrfs/block-rsv.c:537 btrfs_use_block_rsv+0x560/0x760 [btrfs]
[75721.581854] CPU: 24 PID: 2327559 Comm: kworker/u64:10 Kdump: loaded Tainted: G W 5.18.0-rc2-BTRFS-ZNS+ #109
[75721.597200] Hardware name: Supermicro Super Server/H12SSL-NT, BIOS 2.0 02/22/2021
[75721.607310] Workqueue: btrfs-endio-write btrfs_work_helper [btrfs]
[75721.616209] RIP: 0010:btrfs_use_block_rsv+0x560/0x760 [btrfs]
[75721.646649] RSP: 0018:ffffc9000fbdf3e0 EFLAGS: 00010286
[75721.654126] RAX: 0000000000000000 RBX: 0000000000004000 RCX: 0000000000000000
[75721.663524] RDX: 0000000000000004 RSI: 0000000000000008 RDI: fffff52001f7be6e
[75721.672921] RBP: ffffc9000fbdf420 R08: 0000000000000001 R09: ffff889f8d1fc6c7
[75721.682493] R10: ffffed13f1a3f8d8 R11: 0000000000000001 R12: ffff88980a3c0e28
[75721.692284] R13: ffff889b66590000 R14: ffff88980a3c0e40 R15: ffff88980a3c0e8a
[75721.701878] FS: 0000000000000000(0000) GS:ffff889f8d000000(0000) knlGS:0000000000000000
[75721.712601] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[75721.720726] CR2: 000055d12e05c018 CR3: 0000800193594000 CR4: 0000000000350ee0
[75721.730499] Call Trace:
[75721.735166] <TASK>
[75721.739886] btrfs_alloc_tree_block+0x1e1/0x1100 [btrfs]
[75721.747545] ? btrfs_alloc_logged_file_extent+0x550/0x550 [btrfs]
[75721.756145] ? btrfs_get_32+0xea/0x2d0 [btrfs]
[75721.762852] ? btrfs_get_32+0xea/0x2d0 [btrfs]
[75721.769520] ? push_leaf_left+0x420/0x620 [btrfs]
[75721.776431] ? memcpy+0x4e/0x60
[75721.781931] split_leaf+0x433/0x12d0 [btrfs]
[75721.788392] ? btrfs_get_token_32+0x580/0x580 [btrfs]
[75721.795636] ? push_for_double_split.isra.0+0x420/0x420 [btrfs]
[75721.803759] ? leaf_space_used+0x15d/0x1a0 [btrfs]
[75721.811156] btrfs_search_slot+0x1bc3/0x2790 [btrfs]
[75721.818300] ? lock_downgrade+0x7c0/0x7c0
[75721.824411] ? free_extent_buffer.part.0+0x107/0x200 [btrfs]
[75721.832456] ? split_leaf+0x12d0/0x12d0 [btrfs]
[75721.839149] ? free_extent_buffer.part.0+0x14f/0x200 [btrfs]
[75721.846945] ? free_extent_buffer+0x13/0x20 [btrfs]
[75721.853960] ? btrfs_release_path+0x4b/0x190 [btrfs]
[75721.861429] btrfs_csum_file_blocks+0x85c/0x1500 [btrfs]
[75721.869313] ? rcu_read_lock_sched_held+0x16/0x80
[75721.876085] ? lock_release+0x552/0xf80
[75721.881957] ? btrfs_del_csums+0x8c0/0x8c0 [btrfs]
[75721.888886] ? __kasan_check_write+0x14/0x20
[75721.895152] ? do_raw_read_unlock+0x44/0x80
[75721.901323] ? _raw_write_lock_irq+0x60/0x80
[75721.907983] ? btrfs_global_root+0xb9/0xe0 [btrfs]
[75721.915166] ? btrfs_csum_root+0x12b/0x180 [btrfs]
[75721.921918] ? btrfs_get_global_root+0x820/0x820 [btrfs]
[75721.929166] ? _raw_write_unlock+0x23/0x40
[75721.935116] ? unpin_extent_cache+0x1e3/0x390 [btrfs]
[75721.942041] btrfs_finish_ordered_io.isra.0+0xa0c/0x1dc0 [btrfs]
[75721.949906] ? try_to_wake_up+0x30/0x14a0
[75721.955700] ? btrfs_unlink_subvol+0xda0/0xda0 [btrfs]
[75721.962661] ? rcu
---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btrfs文件系统使用固定值BTRFS_MAX_EXTENT_SIZE计算元数据预留量，可能导致元数据耗尽。
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-2022-50090 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-06-18 · 共 362 条
| CVE-2025-38075 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-50098 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38052 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49934 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50164 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38016 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38074 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49974 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49968 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50022 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50028 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49935 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38082 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50182 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38080 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38079 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38060 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38062 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50101 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 362 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-50090
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