CVE-2026-58088— Race condition in ELF core dump segment counting
Quick assessment
Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
ELF 核心转储（core dump）代码首先计算可转储的虚拟内存映射条目数量，为对应的程序头分配缓冲区，然后第二次遍历该映射以填充这些程序头。由于通过 共享地址空间的进程可以在两次遍历之间修改映射内容，导致第二次遍历时将程序头写入缓冲区末尾之外。 一个本地非特权用户，若与发生核心转储的进程共享地址空间，则可触发内核堆上的越界写入漏洞，可能导致权限提升（privilege escalation）。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-58088
Vulnerability Information
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Vulnerability Title
Race condition in ELF core dump segment counting
Source: CVE Program / CVE List V5
Vulnerability Description
The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding program headers, then iterated over the map a second time to populate them. A process sharing the address space via rfork(2) can mutate the map between the two passes, causing the second pass to write program headers past the end of the buffer.
An unprivileged local user sharing an address space with a process that dumps core can trigger an out-of-bounds write on the kernel heap, potentially leading to privilege escalation.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-58088
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-58088 (1)
Same Patch Batch · FreeBSD · 2026-08-19 · 23 CVEs total
| CVE-2026-49426 | Incorrect audit records for ptrace(2) syscall requests | |
| CVE-2026-58087 | Heap out-of-bounds access in semctl(2) | |
| CVE-2026-58083 | Use-after-free in kqueue copy-on-fork | |
| CVE-2026-58084 | Kernel stack disclosure via timer_settime(2) | |
| CVE-2026-58085 | Missing MAC validation in wg(4) packet decryption | |
| CVE-2026-58086 | ktrace(2) privilege incorrectly validated in jails | |
| CVE-2026-49425 | Kernel stack disclosure in 32-bit compatibility support | |
| CVE-2026-49424 | Kernel stack disclosure in Linux compatibility layer | |
| CVE-2026-58081 | Heap based buffer overflow in iconv(3) | |
| CVE-2026-58082 | Stack based buffer overflow in iconv(3) | |
| CVE-2026-49423 | Remote DOS via uninitialized memory access in KTLS receive | |
| CVE-2026-49418 | Use-after-free in device pager page list | |
| CVE-2026-49427 | posixshm: largepage shared memory objects not explicitly wired | |
| CVE-2026-49428 | posixshm: system calls can incorrectly free memory of largepage objects | |
| CVE-2026-49420 | Buffer overflow in libalias RTSP handler | |
| CVE-2026-49422 | Use-after-free in TCP RACK stack option handler | |
| CVE-2026-49421 | unlinkat(2) ignores AT_RESOLVE_BENEATH flag | |
| CVE-2026-49430 | Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl | |
| CVE-2026-49429 | Kernel heap overflow in ZFS_IOC_USERSPACE_MANY ioctl | |
| CVE-2026-49431 | Incorrect user validation in ZFS_IOC_SET_PROP ioctl |
Showing top 20 of 23 CVEs. View all on vendor page → →
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Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-362
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V. Comments for CVE-2026-58088
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