CVE-2026-92483— liveupdate FLB retrieve()状态修复
一分钟漏洞结论
影响对象
Linux Linux
利用判断
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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。
在 Linux 内核中，以下漏洞已得到解决： liveupdate：记录 FLB retrieve() 状态 LUO 会跟踪针对 FLB（File Load Bundle，文件加载包）成功的 retrieve 尝试，以避免对同一 FLB 进行多次 retrieve 操作。之所以要避免多次 retrieve，是因为一旦 FLB 被 retrieve，其序列化的数据结构很可能已被释放，且 FLB 的实际状态与代码预期可能存在较大差异。 当 retrieve 成功时，这种机制运行良好。但当 retrieve 失败时， 会
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一、 漏洞 CVE-2026-92483 基础信息
漏洞信息
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Vulnerability Title
liveupdate: Remember FLB retrieve() status
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
liveupdate: Remember FLB retrieve() status
LUO keeps track of successful retrieve attempts on an FLB. It does so
to avoid multiple retrievals of the same FLB. Multiple retrievals cause
problems because once the FLB is retrieved, the serialized data
structures are likely freed and the FLB is likely in a very different
state from what the code expects.
All this works well when retrieve succeeds. When it fails,
luo_flb_retrieve_one() returns the error immediately, without ever
storing anywhere that a retrieve was attempted or what its error code
was. If the user attempts to retrieve another file registered with the
same FLB, LUO will attempt to call the FLB's retrieve() callback again.
The retry is problematic for much of the same reasons listed above. The
FLB is likely in a very different state than what the retrieve logic
normally expects (e.g. some KHO pages may have already been restored and
freed).
There is no sane way of attempting the retrieve again. Remember the
error retrieve returned and directly return it on a retry.
This is done by changing the retrieved bool to a retrieve_status
integer. A value of 0 means retrieve was never attempted, a positive
value means it succeeded, and a negative value means it failed and the
error code is the value.
This is similar to commit f85b1c6af5bc ("liveupdate: luo_file: remember
retrieve() status") which did the same for LUO files.
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
受影响产品
二、漏洞 CVE-2026-92483 的公开POC
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CVE-2026-92483 补丁与修复 (1)
同批安全公告 · Linux · 2026-09-17 · 共 600 条
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显示前 20 条，共 600 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-92483
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