CVE-2026-46253— 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pstore ram模块在persistent_ram_save_old函数中多次调用时未正确更新old_log_size，可能导致堆缓冲区溢出和越界读取。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 58bda5a1d1ee98254383ef34f76b2c35140513ea |
affected |
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 06d2c8bd108cea503f6f6e13e47495ed1085275f |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 2fa9a047c6a50ec80c3890dd623b85e237f0d1fd |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< cff0ef043e16feb5a02307c8f9d0117a96c5587c |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 9a6fc69a570c0780834246d52c856cc3dbc2605f |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 4f73486ca822305c1cf5b8ebc0b53a6ab3801a81 |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 7cfe964e61c0ab667abd5f5b68e0acbf783efa4f |
affected | ||
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 5669645c052f235726a85f443769b6fc02f66762 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-46253 基础信息
漏洞信息
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Vulnerability Title
pstore/ram: fix buffer overflow in persistent_ram_save_old()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
pstore/ram: fix buffer overflow in persistent_ram_save_old()
persistent_ram_save_old() can be called multiple times for the same
persistent_ram_zone (e.g., via ramoops_pstore_read -> ramoops_get_next_prz
for PSTORE_TYPE_DMESG records).
Currently, the function only allocates prz->old_log when it is NULL,
but it unconditionally updates prz->old_log_size to the current buffer
size and then performs memcpy_fromio() using this new size. If the
buffer size has grown since the first allocation (which can happen
across different kernel boot cycles), this leads to:
1. A heap buffer overflow (OOB write) in the memcpy_fromio() calls
2. A subsequent OOB read when ramoops_pstore_read() accesses the buffer
using the incorrect (larger) old_log_size
The KASAN splat would look similar to:
BUG: KASAN: slab-out-of-bounds in ramoops_pstore_read+0x...
Read of size N at addr ... by task ...
The conditions are likely extremely hard to hit:
0. Crash with a ramoops write of less-than-record-max-size bytes.
1. Reboot: ramoops registers, pstore_get_records(0) reads old crash,
allocates old_log with size X
2. Crash handler registered, timer started (if pstore_update_ms >= 0)
3. Oops happens (non-fatal, system continues)
4. pstore_dump() writes oops via ramoops_pstore_write() size Y (>X)
5. pstore_new_entry = 1, pstore_timer_kick() called
6. System continues running (not a panic oops)
7. Timer fires after pstore_update_ms milliseconds
8. pstore_timefunc() → schedule_work() → pstore_dowork() → pstore_get_records(1)
9. ramoops_get_next_prz() → persistent_ram_save_old()
10. buffer_size() returns Y, but old_log is X bytes
11. Y > X: memcpy_fromio() overflows heap
Requirements:
- a prior crash record exists that did not fill the record size
(almost impossible since the crash handler writes as much as it
can possibly fit into the record, capped by max record size and
the kmsg buffer almost always exceeds the max record size)
- pstore_update_ms >= 0 (disabled by default)
- Non-fatal oops (system survives)
Free and reallocate the buffer when the new size differs from the
previously allocated size. This ensures old_log always has sufficient
space for the data being copied.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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pstore ram模块在persistent_ram_save_old函数中多次调用时未正确更新old_log_size，可能导致堆缓冲区溢出和越界读取。
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-2026-46253 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-46253 补丁与修复 (8)
同批安全公告 · Linux · 2026-06-03 · 共 32 条
| CVE-2026-46244 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46266 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46264 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46273 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46251 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46270 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46263 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46260 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46259 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46271 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46265 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46250 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71314 | Linux kernel 安全漏洞 | |
| CVE-2026-46245 | Linux kernel 安全漏洞 | |
| CVE-2025-71313 | Linux kernel 安全漏洞 | |
| CVE-2026-46246 | Linux kernel 安全漏洞 | |
| CVE-2026-46247 | Linux kernel 安全漏洞 | |
| CVE-2026-46248 | Linux kernel 安全漏洞 | |
| CVE-2026-46249 | Linux kernel 安全漏洞 | |
| CVE-2026-46258 | Linux kernel 安全漏洞 |
显示前 20 条，共 32 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-46253
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