CVE-2026-63811— 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基金会开源的一款操作系统内核。 Linux kernel 6.4版本存在安全漏洞，该漏洞源于在原子写操作中读取写时复制（COW）数据时使用了错误的inode，可能导致内核空指针取消引用。
可能的 ATT&CK 技术 1 AI
T1564.008 · Email Hiding Rules影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 591fc34e1f98b0d7eef4aa3440bfdff3c5a1cadd< 7e4ab3907f44dc243d026048d7f5d477dae9267b |
affected |
591fc34e1f98b0d7eef4aa3440bfdff3c5a1cadd< a92332f32a8d31a7eee47b1dc1d751cb3319908f |
affected | ||
591fc34e1f98b0d7eef4aa3440bfdff3c5a1cadd< a41075acde0124d2f8a5f563068a5d63e8ffd57b |
affected | ||
6.4 |
affected | ||
< 6.4 |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
7.1.3≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-63811 基础信息
漏洞信息
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Vulnerability Title
f2fs: read COW data with the original inode during atomic write
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: read COW data with the original inode during atomic write
When updating an atomic-write file, f2fs_write_begin() may read the
previously written data back from the COW inode:
prepare_atomic_write_begin() locates the block in the COW inode and sets
use_cow, and the read bio is then built with the COW inode:
f2fs_submit_page_read(use_cow ? F2FS_I(inode)->cow_inode : inode,
...);
and f2fs_grab_read_bio() decides whether to schedule fs-layer decryption
(STEP_DECRYPT) for the bio based on that inode via
fscrypt_inode_uses_fs_layer_crypto().
However, the folio being filled belongs to the original inode
(folio->mapping->host == inode), and the data stored in the COW block was
encrypted (or left as plaintext) using the original inode's context, not
the COW inode's -- see f2fs_encrypt_one_page(), which keys off
fio->page->mapping->host. fscrypt_decrypt_pagecache_blocks() likewise
operates on folio->mapping->host.
The COW inode is created as a tmpfile in the parent directory and inherits
its encryption policy from there. With test_dummy_encryption the newly
created COW inode gets the dummy policy and becomes encrypted, while a
pre-existing regular file -- created before the policy applied, e.g.
already present in the on-disk image -- stays unencrypted. The read
path then sets STEP_DECRYPT based on the encrypted COW inode and calls
fscrypt_decrypt_pagecache_blocks() on a folio whose host (the unencrypted
original inode) has a NULL ->i_crypt_info, dereferencing it:
Oops: general protection fault, probably for non-canonical address ...
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
RIP: 0010:fscrypt_decrypt_pagecache_blocks+0xa0/0x310
Workqueue: f2fs_post_read_wq f2fs_post_read_work
Call Trace:
fscrypt_decrypt_bio+0x1eb/0x340
f2fs_post_read_work+0xba/0x140
process_one_work+0x91c/0x1a40
worker_thread+0x677/0xe90
kthread+0x2bc/0x3a0
The COW inode is only needed to locate the on-disk block, and that block
address is already resolved into @blkaddr by prepare_atomic_write_begin()
via __find_data_block(cow_inode, ...); f2fs_submit_page_read() then reads
from that physical @blkaddr directly, so the inode argument only selects
the post-read crypto context, not which block is fetched. Reading with
@inode therefore returns the same (latest, not-yet-committed) COW data,
while making both the fs-layer decryption decision and the inline crypto
path use the correct (original inode's) key.
With the COW inode no longer used at the read site, the use_cow flag has no
remaining consumer; drop it from f2fs_write_begin() and
prepare_atomic_write_begin().
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基金会开源的一款操作系统内核。 Linux kernel 6.4版本存在安全漏洞，该漏洞源于在原子写操作中读取写时复制（COW）数据时使用了错误的inode，可能导致内核空指针取消引用。
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-2026-63811 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-63811 补丁与修复 (2)
CVE-2026-63811 其他参考 (1)
同批安全公告 · Linux · 2026-07-19 · 共 429 条
| CVE-2026-63795 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63984 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63979 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63800 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64142 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63978 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64056 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63808 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64055 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63922 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64033 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64113 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63825 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64016 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64122 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64047 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64035 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64025 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64150 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 429 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-63811
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