CVE-2026-64496— 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基金会开源的一款操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于事件FIFO重置竞态问题，可能导致越界读取并泄露相邻内核内存。
可能的 ATT&CK 技术 1 AI
T1059.004 · Unix Shell影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b91accafbb1031b80d22ad83576877ff2f8b4774< 9dc84ba4be5bbeb29ee49efe6cea2cb32c461424 |
affected |
b91accafbb1031b80d22ad83576877ff2f8b4774< d16a702ca7d29c0b7a9b509339d1b044a1cadb32 |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< a13ef1adbc62085b21b546b07b0be7e2fbf52150 |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< 0d4a646d7f87ea3625fafe387043fddc6a2f5e7f |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< 72c6aa8e0d74eab91b8694cde97dec088c248fee |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< 9edefd4c56bee3fe331e0355d1f10a533134999d |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< f187dc5a4c4846ffa07d9bda6e760837ed005574 |
affected | ||
b91accafbb1031b80d22ad83576877ff2f8b4774< af791d295737ea6b6ff2c8d8488462a49c14af01 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-64496 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！
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Vulnerability Title
iio: event: Fix event FIFO reset race
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
iio: event: Fix event FIFO reset race
`iio_event_getfd()` creates the event file descriptor with
`anon_inode_getfd()`, which allocates a new fd, creates the anonymous
file and installs it in the process fd table before returning to the
caller.
The IIO code resets the event FIFO after `anon_inode_getfd()` has returned,
but before `IIO_GET_EVENT_FD_IOCTL` has copied the fd number to userspace.
But since fd tables are shared between threads, another thread can guess
the newly allocated fd number and issue a `read()` on it as soon as the fd
has been installed.
This means the `kfifo_to_user()` in `iio_event_chrdev_read()` can run in
parallel with the `kfifo_reset_out()` in `iio_event_getfd()`.
The kfifo documentation says that `kfifo_reset_out()` is only safe when it
is called from the reader thread and there is only one concurrent reader.
Otherwise it is dangerous and must be handled in the same way as
`kfifo_reset()`.
If that happens, `kfifo_to_user()` can advance the FIFO `out` index based
on state from before the reset, after the reset has already moved the `out`
index to the current `in` index. That can leave the FIFO with an `out`
index past the `in` index. A later `read()` can then see an underflowed
FIFO length and copy more data than the event FIFO buffer contains. This
can result in an out-of-bounds read and leak adjacent kernel memory to
userspace.
Move the FIFO reset before `anon_inode_getfd()`. At that point the event fd is
marked busy, but the new fd has not been installed yet, so userspace cannot
access it while the FIFO is reset.
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:N/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基金会开源的一款操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于事件FIFO重置竞态问题，可能导致越界读取并泄露相邻内核内存。
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-2026-64496 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-64496 补丁与修复 (8)
同批安全公告 · Linux · 2026-07-25 · 共 274 条
| CVE-2026-64397 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64268 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64383 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64385 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64386 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64387 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64391 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64399 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64523 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64355 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64459 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64439 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64303 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64410 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64392 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64450 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64269 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64319 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64393 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 274 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-64496
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