CVE-2026-89979— ALSA pcm 非原子操作触发竞态漏洞
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，已修复以下漏洞： ALSA: pcm：修复非原子操作与触发启动之间的竞态条件 我们保护了并发状态转换中原子 PCM 操作的竞态条件，但对于非原子操作（如 hw_params、hw_free 和 prepare）与原子操作之间的检查并不完善。虽然 等操作的开头会对冲突的 PCM 状态进行检查，但在非原子 PCM 操作执行期间，原子 PCM 操作仍可能被发起。 一个典型的场景示例是：线程 A 对已处于 prepared 状态的流重新发起 或 ，与此同时，另一个线程 B 在 操作进行到一半时触发了
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b1d12144557fceed5de6e22e2c2e30a40ed37702 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b2edc017f94c08bdd0b046a586e43ac771a2f942 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b599e7f16441386754ec083fa62a549bccb02fca |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ad29779736cfd6f5595f0cab300dd7611418e363 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7ad2ea7c10044b08ecf7b04376916faf12e17a99 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 50afadf1ea66597116eb14e73c24da7ae99b759f |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< acac7b5e07349a9d10d78873afb4b93cd1dc721f |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-89979 基础信息
漏洞信息
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Vulnerability Title
ALSA: pcm: Fix race between non-atomic ops and trigger-start
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: pcm: Fix race between non-atomic ops and trigger-start
We protect the races of the concurrent state transitions between
atomic PCM ops, but the checks between the non-atomic ops (hw_params,
hw_free and prepare) and the atomic ops aren't perfect; there is a
check of the conflicting PCM state at the beginning of hw_params & co,
but the atomic PCM ops can be still issued during the non-atomic PCM
operations. An example such scenario is that a thread A re-issues the
PREPARE or HW_PARAMS for the already prepared stream, while another
thread B triggers the PCM start in the middle of the prepare
operation. Although this usually doesn't lead to much serious issues,
it can give some inconsistency as reported by syzkaller (such as
ODEBUG warning).
There are various atomic PCM ops, and basically the only problem is
the PCM start as it operates from the PREPARED state. Other trigger
commands (stop, etc) are for the running or the other special state,
hence they are filtered as pre-condition.
This patch is for preventing the PCM trigger-start during the non-
atomic operations in order to address the problems above.
Fortunately, the hw_params, hw_free and prepare operations call
snd_pcm_buffer_access_lock(), and this can be used for checking the
concurrent operations at the PCM trigger -- which sets the
runtime->buffer_accessing to a negative (if possible), so the PCM
trigger just needs to check the runtime->buffer_accessing value; if
it's negative, it means the concurrent non-atomic PCM ops is running.
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
受影响产品
二、漏洞 CVE-2026-89979 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-89979 其他参考 (8)
同批安全公告 · Linux · 2026-09-16 · 共 276 条
| CVE-2026-90048 | 9.8 CRITICAL | Linux内核NTFS3文件系统越界写漏洞 |
| CVE-2026-90012 | 9.8 CRITICAL | SPI DMA映射所有权修复 |
| CVE-2026-89970 | 9.8 CRITICAL | NVM Target SQ拆除时超时工作未同步 |
| CVE-2026-89857 | 9.8 CRITICAL | QLogic qla2xxx NVMe LS拒绝竞态条件漏洞 |
| CVE-2026-89969 | 9.8 CRITICAL | Linux内核 nvmet-tcp 越界写入漏洞 |
| CVE-2026-89847 | 9.8 CRITICAL | qla2xxx SCSI驱动异步IOCB超时双重完成漏洞 |
| CVE-2026-89972 | 9.8 CRITICAL | NVMe驱动错误路径SRCU宽限期缺失漏洞 |
| CVE-2026-89990 | 9.8 CRITICAL | Ceph ceph_mds_check_access 互斥锁缺失漏洞 |
| CVE-2026-90036 | 9.8 CRITICAL | Linux NFSd 阻塞锁收割时释放后使用漏洞 |
| CVE-2026-90038 | 9.8 CRITICAL | Linux内核NFSD导出撤销后使用漏洞 |
| CVE-2026-90037 | 9.8 CRITICAL | Linux内核NFSD close_lru释放后使用漏洞 |
| CVE-2026-89788 | 9.8 CRITICAL | Linux kernel ksmbd 释放后使用漏洞 |
| CVE-2026-89783 | 9.8 CRITICAL | Linux内核 xfrm6 越界写入漏洞 |
| CVE-2026-90042 | 9.8 CRITICAL | Ceph 虚拟内存分配缓冲区文件名解密漏洞 |
| CVE-2026-89778 | 9.8 CRITICAL | isofs 空 zisofs 块页面数组越界访问漏洞 |
| CVE-2026-89915 | 9.3 CRITICAL | KVM arm64 移除虚拟机级 VNCR 映射计数器 |
| CVE-2026-90049 | 9.3 CRITICAL | 内核网络子系统中skb_zerocopy处理中的缺陷 |
| CVE-2026-89775 | 9.3 CRITICAL | KVM arm64 VNCR TLB大小计算漏洞 |
| CVE-2026-89916 | 9.3 CRITICAL | KVM arm64 VNCR失效重试漏洞 |
| CVE-2026-89930 | 9.3 CRITICAL | KVM嵌套虚拟化本地TLB刷新漏洞 |
显示前 20 条，共 276 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89979
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