CVE-2026-31426— 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acpi_ec_setup函数在探测失败时未清理处理程序，可能导致释放后重用。
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 03e9a0e05739cf872fee494b06c75c0469704a21< 022d1727f33ff90b3e1775125264e3023901952e |
affected |
03e9a0e05739cf872fee494b06c75c0469704a21< 9c886e63b69658959633937e3acb7ca8addf7499 |
affected | ||
03e9a0e05739cf872fee494b06c75c0469704a21< 808c0f156f48d5b8ca34088cbbfba8444e606cbc |
affected | ||
03e9a0e05739cf872fee494b06c75c0469704a21< d04c007047c88158141d9bd5eac761cdadd3782c |
affected | ||
03e9a0e05739cf872fee494b06c75c0469704a21< be1a827e15991e874e0d5222d0ea5fdad01960fe |
affected | ||
03e9a0e05739cf872fee494b06c75c0469704a21< f6484cadbcaf26b5844b51bd7307a663dda48ef6 |
affected | ||
5.7 |
affected | ||
< 5.7 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-31426 基础信息
漏洞信息
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Vulnerability Title
ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
When ec_install_handlers() returns -EPROBE_DEFER on reduced-hardware
platforms, it has already started the EC and installed the address
space handler with the struct acpi_ec pointer as handler context.
However, acpi_ec_setup() propagates the error without any cleanup.
The caller acpi_ec_add() then frees the struct acpi_ec for non-boot
instances, leaving a dangling handler context in ACPICA.
Any subsequent AML evaluation that accesses an EC OpRegion field
dispatches into acpi_ec_space_handler() with the freed pointer,
causing a use-after-free:
BUG: KASAN: slab-use-after-free in mutex_lock (kernel/locking/mutex.c:289)
Write of size 8 at addr ffff88800721de38 by task init/1
Call Trace:
<TASK>
mutex_lock (kernel/locking/mutex.c:289)
acpi_ec_space_handler (drivers/acpi/ec.c:1362)
acpi_ev_address_space_dispatch (drivers/acpi/acpica/evregion.c:293)
acpi_ex_access_region (drivers/acpi/acpica/exfldio.c:246)
acpi_ex_field_datum_io (drivers/acpi/acpica/exfldio.c:509)
acpi_ex_extract_from_field (drivers/acpi/acpica/exfldio.c:700)
acpi_ex_read_data_from_field (drivers/acpi/acpica/exfield.c:327)
acpi_ex_resolve_node_to_value (drivers/acpi/acpica/exresolv.c:392)
</TASK>
Allocated by task 1:
acpi_ec_alloc (drivers/acpi/ec.c:1424)
acpi_ec_add (drivers/acpi/ec.c:1692)
Freed by task 1:
kfree (mm/slub.c:6876)
acpi_ec_add (drivers/acpi/ec.c:1751)
The bug triggers on reduced-hardware EC platforms (ec->gpe < 0)
when the GPIO IRQ provider defers probing. Once the stale handler
exists, any unprivileged sysfs read that causes AML to touch an
EC OpRegion (battery, thermal, backlight) exercises the dangling
pointer.
Fix this by calling ec_remove_handlers() in the error path of
acpi_ec_setup() before clearing first_ec. ec_remove_handlers()
checks each EC_FLAGS_* bit before acting, so it is safe to call
regardless of how far ec_install_handlers() progressed:
-ENODEV (handler not installed): only calls acpi_ec_stop()
-EPROBE_DEFER (handler installed): removes handler, stops EC
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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acpi_ec_setup函数在探测失败时未清理处理程序，可能导致释放后重用。
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-2026-31426 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-13 · 共 15 条
| CVE-2026-31414 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31419 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31417 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31428 | Linux kernel 安全漏洞 | |
| CVE-2026-31427 | Linux kernel 安全漏洞 | |
| CVE-2026-31425 | Linux kernel 安全漏洞 | |
| CVE-2026-31424 | Linux kernel 安全漏洞 | |
| CVE-2026-31423 | Linux kernel 安全漏洞 | |
| CVE-2026-31422 | Linux kernel 安全漏洞 | |
| CVE-2026-31420 | Linux kernel 安全漏洞 | |
| CVE-2026-31421 | Linux kernel 安全漏洞 | |
| CVE-2026-31418 | Linux kernel 安全漏洞 | |
| CVE-2026-31416 | Linux kernel 安全漏洞 | |
| CVE-2026-31415 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-31426
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