CVE-2026-31769— 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gpib驱动在IO ioctl处理程序中释放锁后使用gpib_descriptor指针，可能导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9dde4559e93955ccc47d588f7fd051684d55c4e7< cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c |
affected |
9dde4559e93955ccc47d588f7fd051684d55c4e7< 28c75dd143ead62e0dfac564c79d251e21d5d74b |
affected | ||
9dde4559e93955ccc47d588f7fd051684d55c4e7< d1857f8296dceb75d00ab857fc3c61bc00c7f5c6 |
affected | ||
6.13 |
affected | ||
< 6.13 |
unaffected | ||
6.18.22≤ 6.18.* |
unaffected | ||
6.19.12≤ 6.19.* |
unaffected | ||
7.0≤ * |
unaffected |
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-31769 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
gpib: fix use-after-free in IO ioctl handlers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
gpib: fix use-after-free in IO ioctl handlers
The IBRD, IBWRT, IBCMD, and IBWAIT ioctl handlers use a gpib_descriptor
pointer after board->big_gpib_mutex has been released. A concurrent
IBCLOSEDEV ioctl can free the descriptor via close_dev_ioctl() during
this window, causing a use-after-free.
The IO handlers (read_ioctl, write_ioctl, command_ioctl) explicitly
release big_gpib_mutex before calling their handler. wait_ioctl() is
called with big_gpib_mutex held, but ibwait() releases it internally
when wait_mask is non-zero. In all four cases, the descriptor pointer
obtained from handle_to_descriptor() becomes unprotected.
Fix this by introducing a kernel-only descriptor_busy reference count
in struct gpib_descriptor. Each handler atomically increments
descriptor_busy under file_priv->descriptors_mutex before releasing the
lock, and decrements it when done. close_dev_ioctl() checks
descriptor_busy under the same lock and rejects the close with -EBUSY
if the count is non-zero.
A reference count rather than a simple flag is necessary because
multiple handlers can operate on the same descriptor concurrently
(e.g. IBRD and IBWAIT on the same handle from different threads).
A separate counter is needed because io_in_progress can be cleared from
unprivileged userspace via the IBWAIT ioctl (through general_ibstatus()
with set_mask containing CMPL), which would allow an attacker to bypass
a check based solely on io_in_progress. The new descriptor_busy
counter is only modified by the kernel IO paths.
The lock ordering is consistent (big_gpib_mutex -> descriptors_mutex)
and the handlers only hold descriptors_mutex briefly during the lookup,
so there is no deadlock risk and no impact on IO throughput.
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gpib驱动在IO ioctl处理程序中释放锁后使用gpib_descriptor指针，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-2026-31769 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-31769 的情报信息
请登录查看更多情报信息。
CVE-2026-31769 补丁与修复 (3)
同批安全公告 · Linux · 2026-05-01 · 共 146 条
| CVE-2026-43037 | 9.8 CRITICAL | Linux kernel 缓冲区错误漏洞 |
| CVE-2026-43011 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31705 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43038 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31718 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31773 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43018 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31706 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31739 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31709 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43048 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31717 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31735 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31712 | 8.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31771 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31779 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43051 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31708 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43056 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 146 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31769
暂无评论