CVE-2022-48733— 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 模块创建快照失败后存在释放后重用问题。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | c37b2b6269ee4637fb7cdb5da0d1e47215d57ce2< 7e4c72dbaf62f8978af8321a24dbd35566d3a78a |
affected |
c37b2b6269ee4637fb7cdb5da0d1e47215d57ce2< a7b717fa15165d3d9245614680bebc48a52ac05d |
affected | ||
c37b2b6269ee4637fb7cdb5da0d1e47215d57ce2< 9372fa1d73da5f1673921e365d0cd2c27ec7adc2 |
affected | ||
c37b2b6269ee4637fb7cdb5da0d1e47215d57ce2< 28b21c558a3753171097193b6f6602a94169093a |
affected | ||
3.7 |
affected | ||
< 3.7 |
unaffected | ||
5.10.226≤ 5.10.* |
unaffected | ||
5.15.22≤ 5.15.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2022-48733 基础信息
漏洞信息
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Vulnerability Title
btrfs: fix use-after-free after failure to create a snapshot
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix use-after-free after failure to create a snapshot
At ioctl.c:create_snapshot(), we allocate a pending snapshot structure and
then attach it to the transaction's list of pending snapshots. After that
we call btrfs_commit_transaction(), and if that returns an error we jump
to 'fail' label, where we kfree() the pending snapshot structure. This can
result in a later use-after-free of the pending snapshot:
1) We allocated the pending snapshot and added it to the transaction's
list of pending snapshots;
2) We call btrfs_commit_transaction(), and it fails either at the first
call to btrfs_run_delayed_refs() or btrfs_start_dirty_block_groups().
In both cases, we don't abort the transaction and we release our
transaction handle. We jump to the 'fail' label and free the pending
snapshot structure. We return with the pending snapshot still in the
transaction's list;
3) Another task commits the transaction. This time there's no error at
all, and then during the transaction commit it accesses a pointer
to the pending snapshot structure that the snapshot creation task
has already freed, resulting in a user-after-free.
This issue could actually be detected by smatch, which produced the
following warning:
fs/btrfs/ioctl.c:843 create_snapshot() warn: '&pending_snapshot->list' not removed from list
So fix this by not having the snapshot creation ioctl directly add the
pending snapshot to the transaction's list. Instead add the pending
snapshot to the transaction handle, and then at btrfs_commit_transaction()
we add the snapshot to the list only when we can guarantee that any error
returned after that point will result in a transaction abort, in which
case the ioctl code can safely free the pending snapshot and no one can
access it anymore.
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 btrfs 模块创建快照失败后存在释放后重用问题。
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-2022-48733 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-48733 补丁与修复 (1)
CVE-2022-48733 其他参考 (2)
同批安全公告 · Linux · 2024-06-20 · 共 67 条
| CVE-2022-48711 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-38620 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47620 | 8.1 HIGH | Linux kernel安全漏洞 |
| CVE-2022-48743 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48754 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48751 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48716 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48771 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48720 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48742 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48721 | 7.8 HIGH | Linux kernel安全漏洞 |
| CVE-2022-48762 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48726 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48735 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48729 | 7.8 HIGH | Linux kernel安全漏洞 |
| CVE-2022-48759 | 7.8 HIGH | Linux kernel安全漏洞 |
| CVE-2022-48744 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48727 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48739 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48717 | 7.1 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 67 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-48733
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