CVE-2026-74734— Linux Firewire OHCI 空指针解引用漏洞
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。
在 Linux 内核中，以下漏洞已得到修复： firewire: ohci: 修复 ar_context_release 中的空指针解引用 在驱动程序 probe 函数的错误处理路径中，ar_context_release() 中可能会出现空指针解引用。 当 pci_probe() 在早期阶段失败时（例如 pcim_enable_device() 或 MMIO 映射失败），devres 清理机制会调用 release_ohci()。该函数无条件地调用 ar_context_release() 以清理异步接收上下文。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 5716e58aecdd4f7225c2e46ce903a839fc54f22f< ed5470771c7ed7f959230c4697f316af83426a90 |
affected |
5716e58aecdd4f7225c2e46ce903a839fc54f22f< 7d228ba43279de2d191f25e139fad166409c2c06 |
affected | ||
5716e58aecdd4f7225c2e46ce903a839fc54f22f< 42d217add8d80d6e7d9f58f80d11ea9b07ea113e |
affected | ||
6.5 |
affected | ||
< 6.5 |
unaffected | ||
6.18.46≤ 6.18.* |
unaffected | ||
7.1.10≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-74734 基础信息
漏洞信息
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Vulnerability Title
firewire: ohci: fix NULL pointer dereference in ar_context_release
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
firewire: ohci: fix NULL pointer dereference in ar_context_release
During the error handling path of the driver's probe function, a NULL
pointer dereference can occur in ar_context_release().
When pci_probe() fails early (e.g., if pcim_enable_device() or MMIO mapping
fails), the devres cleanup mechanism invokes release_ohci(). This function
unconditionally calls ar_context_release() to clean up the asynchronous
receive contexts. However, if ar_context_init() was not yet called,
ctx->ohci remains NULL (as the fw_ohci structure is zero-initialized by
devres_alloc()).
ar_context_release() immediately dereferences ctx->ohci to get the dev
pointer before checking if the context was actually initialized, leading to
a crash:
Oops: general protection fault, probably for non-canonical address
0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
RIP: 0010:ar_context_release+0x3f/0x380 drivers/firewire/ohci.c:543
Call Trace:
release_ohci+0x3f/0x60 drivers/firewire/ohci.c:3567
release_nodes drivers/base/devres.c:546 [inline]
devres_release_all+0x1a8/0x260 drivers/base/devres.c:576
device_unbind_cleanup drivers/base/dd.c:597 [inline]
really_probe+0x451/0xae0 drivers/base/dd.c:772
To fix this, move the assignment of the dev pointer after the !ctx->buffer
check. If ctx->buffer is NULL, it indicates that the context was never
successfully initialized and there is nothing to release, safely avoiding
the dereference of the uninitialized ctx->ohci pointer.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-74734 的公开POC
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CVE-2026-74734 补丁与修复 (3)
同批安全公告 · Linux · 2026-08-26 · 共 92 条
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| CVE-2026-74737 | 9.8 CRITICAL | TI AM65 CPSW 驱动端口ID提取错误 |
| CVE-2026-80589 | 9.8 CRITICAL | 磁盘块：释放未添加磁盘时停止超时定时器 |
| CVE-2026-74743 | 9.8 CRITICAL | macvlan 继承底层设备头部尾部空间 |
| CVE-2026-80586 | 9.8 CRITICAL | Linux内核 MPTCP 模块异常尺寸处理缺陷 |
| CVE-2026-74744 | 9.8 CRITICAL | Linux内核ipvlan模块继承headroom/tailroom |
| CVE-2026-74746 | 9.8 CRITICAL | Netfilter 流表 GC 可见元组发布顺序漏洞 |
| CVE-2026-80519 | 9.8 CRITICAL | OpenVPN 加密回调清理漏洞 |
| CVE-2026-80557 | 9.8 CRITICAL | libceph 2.0 越界读取漏洞 |
| CVE-2026-80528 | 9.8 CRITICAL | Ceph 文件回收竞态漏洞 |
| CVE-2026-80558 | 9.8 CRITICAL | Ceph libceph 模块 OSID 索引缺陷 |
| CVE-2026-74752 | 9.8 CRITICAL | SCTP协议Cookie AUTH状态校验前使用漏洞 |
| CVE-2026-80585 | 9.4 CRITICAL | Linux 内核 MPTCP 快开子流标记错误 |
| CVE-2026-74751 | 9.4 CRITICAL | RISC-V ZBB strnlen越界读取 |
| CVE-2026-80554 | 9.3 CRITICAL | Linux s390/vfio_ccw 通道程序段数限制 |
| CVE-2026-80551 | 9.3 CRITICAL | s390/vfio_ccw: 确保首个IDAW保持不变 |
| CVE-2026-80547 | 8.8 HIGH | s390/vfio_ccw: 实现 CRW 锁 |
| CVE-2026-80553 | 8.8 HIGH | s390/vfio_ccw 队列取消机制 |
| CVE-2026-80576 | 8.8 HIGH | AMD GPU 驱动拒绝超大IB |
显示前 20 条，共 92 条。 查看全部 → →
IV. Related Vulnerabilities
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