CVE-2026-46066— 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ceph中加密分配失败时num_ops计数错误，可能导致内核崩溃。以下版本受到影响：修复版本之前版本。
可能的 ATT&CK 技术 1 AI
T1006 · Direct Volume Access影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d55207717ded95c8f2760a30e93319fa313186e6< 6200f41d6fcf2ac7e24866431e381cbc914560e4 |
affected |
d55207717ded95c8f2760a30e93319fa313186e6< ba12c1e578890f6337a415b7dedf476c6d455105 |
affected | ||
d55207717ded95c8f2760a30e93319fa313186e6< a0d9555bf9eaeba34fe6b6bb86f442fe08ba3842 |
affected | ||
6.6 |
affected | ||
< 6.6 |
unaffected | ||
6.18.30≤ 6.18.* |
unaffected | ||
7.0.4≤ 7.0.* |
unaffected | ||
7.1≤ * |
unaffected |
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一、 漏洞 CVE-2026-46066 基础信息
漏洞信息
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Vulnerability Title
ceph: fix num_ops off-by-one when crypto allocation fails
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ceph: fix num_ops off-by-one when crypto allocation fails
move_dirty_folio_in_page_array() may fail if the file is encrypted, the
dirty folio is not the first in the batch, and it fails to allocate a
bounce buffer to hold the ciphertext. When that happens,
ceph_process_folio_batch() simply redirties the folio and flushes the
current batch -- it can retry that folio in a future batch.
However, if this failed folio is not contiguous with the last folio that
did make it into the batch, then ceph_process_folio_batch() has already
incremented `ceph_wbc->num_ops`; because it doesn't follow through and
add the discontiguous folio to the array, ceph_submit_write() -- which
expects that `ceph_wbc->num_ops` accurately reflects the number of
contiguous ranges (and therefore the required number of "write extent"
ops) in the writeback -- will panic the kernel:
BUG_ON(ceph_wbc->op_idx + 1 != req->r_num_ops);
This issue can be reproduced on affected kernels by writing to
fscrypt-enabled CephFS file(s) with a 4KiB-written/4KiB-skipped/repeat
pattern (total filesize should not matter) and gradually increasing the
system's memory pressure until a bounce buffer allocation fails.
Fix this crash by decrementing `ceph_wbc->num_ops` back to the correct
value when move_dirty_folio_in_page_array() fails, but the folio already
started counting a new (i.e. still-empty) extent.
The defect corrected by this patch has existed since 2022 (see first
`Fixes:`), but another bug blocked multi-folio encrypted writeback until
recently (see second `Fixes:`). The second commit made it into 6.18.16,
6.19.6, and 7.0-rc1, unmasking the panic in those versions. This patch
therefore fixes a regression (panic) introduced by cac190c7674f.
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ceph中加密分配失败时num_ops计数错误，可能导致内核崩溃。以下版本受到影响：修复版本之前版本。
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-2026-46066 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-46066 补丁与修复 (3)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46056 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46010 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46099 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46076 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45935 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46058 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45909 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46065 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45959 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45931 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46015 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 275 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-46066
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