CVE-2026-89962— PowerPC kexec_file 地址截断漏洞
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。
在 Linux 内核中，已修复以下漏洞： powerpc/kexec_file：防止 kexec 地址范围被截断 Sashiko AI 代码审查指出了以下问题： 函数在合并重叠的内存范围时处理不正确。尽管 已提前将所有范围按起始地址升序排序，但合并逻辑仍存在两处缺陷： 1. 它当前将当前范围的起始地址与上一个元素（ ）比较，而不是与正在处理的索引（ ）比较。 2. 它无条件地用 覆盖 。 当较大的内存范围完全包含后续较小的范围时，这一逻辑缺陷会导致严重的内存范围被截断。 示例说明： 假设有一个已排序的输入数组，包含
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 180adfc532a83c1d74146449f7385f767d4b8059< 9ef63622e6cee588ea4b763a6afc87065254b36a |
affected |
180adfc532a83c1d74146449f7385f767d4b8059< da88a2a2119e4fd0e8919a7a2448682f574e1545 |
affected | ||
180adfc532a83c1d74146449f7385f767d4b8059< c4cb547f26d9b73b489c5278d0c8db837c5a174f |
affected | ||
180adfc532a83c1d74146449f7385f767d4b8059< fa40f9dbdd4af53e7445d9135b5b207eb8adf372 |
affected | ||
5.9 |
affected | ||
< 5.9 |
unaffected | ||
6.12.110≤ 6.12.* |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-89962 基础信息
漏洞信息
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Vulnerability Title
powerpc/kexec_file: Prevent kexec range truncation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
powerpc/kexec_file: Prevent kexec range truncation
Sashiko AI review pointed out the following issue.
The __merge_memory_ranges() function incorrectly handles overlapping
memory ranges when merging them. Although sort_memory_ranges() sorts all
ranges by their start address in ascending order beforehand, the merge
logic remains defective in two ways:
1. It compares the current range's start against the previous element (i-1)
instead of the running target index (idx)
2. It unconditionally overwrites 'ranges[idx].end' with 'ranges[i].end'.
This logic flaw leads to critical memory truncation when a larger memory
range completely subsumes subsequent smaller ranges.
For example, consider a sorted input array with three ranges:
Range A (idx=0): [0x1000 - 0x9000]
Range B (i=1): [0x2000 - 0x5000] (completely inside Range A)
Range C (i=2): [0x6000 - 0x8000] (completely inside Range A)
1. When i=1 (Range B):
ranges[1].start (0x2000) <= ranges[0].end + 1 (0x9001) is TRUE.
The code executes: ranges[0].end = ranges[1].end, which erroneously
shrinks Range A's end from 0x9000 down to 0x5000.
2. When i=2 (Range C):
ranges[2].start (0x6000) <= ranges[1].end + 1 (0x5001) is FALSE.
The code falls into the else block, creating a broken new range.
As a result, valid memory fragments [0x5001 - 0x5fff] and [0x8001 - 0x9000]
are completely lost from the kexec exclude lists, potentially allowing
the crash kernel to overwrite active memory, causing data corruption
or crashes.
Fix this by ensuring the start of the current range is compared against the
end of the active merged range (idx), and use max() to safely prevent the
outer boundary from being truncated.
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-2026-89962 的公开POC
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|---|
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CVE-2026-89962 其他参考 (4)
同批安全公告 · Linux · 2026-09-16 · 共 276 条
| CVE-2026-90048 | 9.8 CRITICAL | Linux内核NTFS3文件系统越界写漏洞 |
| CVE-2026-90012 | 9.8 CRITICAL | SPI DMA映射所有权修复 |
| CVE-2026-89970 | 9.8 CRITICAL | NVM Target SQ拆除时超时工作未同步 |
| CVE-2026-89857 | 9.8 CRITICAL | QLogic qla2xxx NVMe LS拒绝竞态条件漏洞 |
| CVE-2026-89969 | 9.8 CRITICAL | Linux内核 nvmet-tcp 越界写入漏洞 |
| CVE-2026-89847 | 9.8 CRITICAL | qla2xxx SCSI驱动异步IOCB超时双重完成漏洞 |
| CVE-2026-89972 | 9.8 CRITICAL | NVMe驱动错误路径SRCU宽限期缺失漏洞 |
| CVE-2026-89990 | 9.8 CRITICAL | Ceph ceph_mds_check_access 互斥锁缺失漏洞 |
| CVE-2026-90036 | 9.8 CRITICAL | Linux NFSd 阻塞锁收割时释放后使用漏洞 |
| CVE-2026-90038 | 9.8 CRITICAL | Linux内核NFSD导出撤销后使用漏洞 |
| CVE-2026-90037 | 9.8 CRITICAL | Linux内核NFSD close_lru释放后使用漏洞 |
| CVE-2026-89788 | 9.8 CRITICAL | Linux kernel ksmbd 释放后使用漏洞 |
| CVE-2026-89783 | 9.8 CRITICAL | Linux内核 xfrm6 越界写入漏洞 |
| CVE-2026-90042 | 9.8 CRITICAL | Ceph 虚拟内存分配缓冲区文件名解密漏洞 |
| CVE-2026-89778 | 9.8 CRITICAL | isofs 空 zisofs 块页面数组越界访问漏洞 |
| CVE-2026-89915 | 9.3 CRITICAL | KVM arm64 移除虚拟机级 VNCR 映射计数器 |
| CVE-2026-90049 | 9.3 CRITICAL | 内核网络子系统中skb_zerocopy处理中的缺陷 |
| CVE-2026-89775 | 9.3 CRITICAL | KVM arm64 VNCR TLB大小计算漏洞 |
| CVE-2026-89916 | 9.3 CRITICAL | KVM arm64 VNCR失效重试漏洞 |
| CVE-2026-89930 | 9.3 CRITICAL | KVM嵌套虚拟化本地TLB刷新漏洞 |
显示前 20 条，共 276 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89962
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