CVE-2026-45855— 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ata libata-scsi模块在NCQ命令持续负载下可能导致非NCQ命令饥饿。
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 | bdb01301f3ea51a59eff252b06643fc1fe843e57< ce22aaed011206fed9cbd8c9c2d44718607f31ee |
affected |
bdb01301f3ea51a59eff252b06643fc1fe843e57< 888cd7e40adb2ef4af1b4d3b6e2e83ad409ae8c2 |
affected | ||
bdb01301f3ea51a59eff252b06643fc1fe843e57< 5d61a38a60e62750526d94663b69b7ac5c7f07a5 |
affected | ||
bdb01301f3ea51a59eff252b06643fc1fe843e57< 0ea84089dbf62a92dc7889c79e6b18fc89260808 |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
6.12.77≤ 6.12.* |
unaffected | ||
6.18.14≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-45855 基础信息
漏洞信息
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Vulnerability Title
ata: libata-scsi: avoid Non-NCQ command starvation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ata: libata-scsi: avoid Non-NCQ command starvation
When a non-NCQ command is issued while NCQ commands are being executed,
ata_scsi_qc_issue() indicates to the SCSI layer that the command issuing
should be deferred by returning SCSI_MLQUEUE_XXX_BUSY. This command
deferring is correct and as mandated by the ACS specifications since
NCQ and non-NCQ commands cannot be mixed.
However, in the case of a host adapter using multiple submission queues,
when the target device is under a constant load of NCQ commands, there
are no guarantees that requeueing the non-NCQ command will be executed
later and it may be deferred again repeatedly as other submission queues
can constantly issue NCQ commands from different CPUs ahead of the
non-NCQ command. This can lead to very long delays for the execution of
non-NCQ commands, and even complete starvation for these commands in the
worst case scenario.
Since the block layer and the SCSI layer do not distinguish between
queueable (NCQ) and non queueable (non-NCQ) commands, libata-scsi SAT
implementation must ensure forward progress for non-NCQ commands in the
presence of NCQ command traffic. This is similar to what SAS HBAs with a
hardware/firmware based SAT implementation do.
Implement such forward progress guarantee by limiting requeueing of
non-NCQ commands from ata_scsi_qc_issue(): when a non-NCQ command is
received and NCQ commands are in-flight, do not force a requeue of the
non-NCQ command by returning SCSI_MLQUEUE_XXX_BUSY and instead return 0
to indicate that the command was accepted but hold on to the qc using
the new deferred_qc field of struct ata_port.
This deferred qc will be issued using the work item deferred_qc_work
running the function ata_scsi_deferred_qc_work() once all in-flight
commands complete, which is checked with the port qc_defer() callback
return value indicating that no further delay is necessary. This check
is done using the helper function ata_scsi_schedule_deferred_qc() which
is called from ata_scsi_qc_complete(). This thus excludes this mechanism
from all internal non-NCQ commands issued by ATA EH.
When a port deferred_qc is non NULL, that is, the port has a command
waiting for the device queue to drain, the issuing of all incoming
commands (both NCQ and non-NCQ) is deferred using the regular busy
mechanism. This simplifies the code and also avoids potential denial of
service problems if a user issues too many non-NCQ commands.
Finally, whenever ata EH is scheduled, regardless of the reason, a
deferred qc is always requeued so that it can be retried once EH
completes. This is done by calling the function
ata_scsi_requeue_deferred_qc() from ata_eh_set_pending(). This avoids
the need for any special processing for the deferred qc in case of NCQ
error, link or device reset, or device timeout.
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ata libata-scsi模块在NCQ命令持续负载下可能导致非NCQ命令饥饿。
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-2026-45855 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-45855 补丁与修复 (4)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 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-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 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-2026-45910 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45931 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45956 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46036 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46100 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45894 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45933 | 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-2026-45855
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