CVE-2026-98312— ALSA 6fire 驱动ISO长度越界写漏洞
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: 6fire：修复因设备报告的 ISO 长度导致的越界写入 函数 在计算每个出向等时（isochronous）数据包的大小时，使用的公式为： 其中 是设备为匹配的 IN 数据包报告的无符号长度。如果数据包以状态 0 完成，且 ，则减法操作会下溢至 ；而在总线上零长度的等时数据包是合法的，且前一个循环仅拒绝非零状态。该总和最终被传递到 ，写入的是 ，这是一个大小为 4832 字节的对象，由 分配。 即使没有发生下溢，结果仍然越界：在 88.2 kHz 或 96 kH
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< 61e665fb48e9eee44ec6d610514af383b1802cc1 |
affected |
c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< 246de677552fe5dede293a1543b632e9853f31e4 |
affected | ||
c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< 001ba7c1d9677225a5ecbc3e60d4865c08bb21d8 |
affected | ||
c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< ea11ade10583cc45af515d6b24510dbfa0184ca6 |
affected | ||
c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< cdc31537012bc7a58c95c6750db321b69dd802bb |
affected | ||
c6d43ba816d1cf1d125bfbfc938f2a28a87facf9< 1589afe2d099d3e817873bc474676968d7080410 |
affected | ||
2.6.39 |
affected | ||
< 2.6.39 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-98312 基础信息
漏洞信息
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Vulnerability Title
ALSA: 6fire: fix OOB write from device-reported iso length
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: 6fire: fix OOB write from device-reported iso length
usb6fire_pcm_in_urb_handler() sizes each outgoing isochronous packet as
(actual_length - 4) / (in_n_analog << 2) * (out_n_analog << 2) + 4, where
actual_length is the unsigned length the device reported for the matching
IN packet. A packet completed with status 0 and actual_length < 4 wraps
the subtraction to 0x7fffffec; a zero-length isochronous packet is legal
on the bus, and the preceding loop rejects only non-zero status. The sum
reaches memset() on out_urb->buffer, a 4832-byte object from
kcalloc(PCM_MAX_PACKET_SIZE, PCM_N_PACKETS_PER_URB).
Even without the wrap the result is out of bounds: at 88.2/96 kHz the
4-in/6-out scaling turns a full 420-byte IN packet into 628, so eight
packets span 5024 bytes of that buffer. usb_submit_urb() rejects an
over-long descriptor only after the memset() and the
usb6fire_pcm_playback() copy of user PCM data have run.
Guard the subtraction as the sibling usb6fire_pcm_capture() already does,
and limit the frame count to what fits in rt->out_packet_size, the OUT
endpoint's wMaxPacketSize. This bounds total_length by the buffer size
while keeping each packet length aligned to a whole output frame.
BUG: KASAN: out-of-bounds in usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338)
Write of size 18446744073709551456 at addr ffff88802a3d0000 by task vhci_rx/5018
Call Trace:
dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
kasan_report (mm/kasan/report.c:595)
kasan_check_range (mm/kasan/generic.c:186 mm/kasan/generic.c:200)
__asan_memset (mm/kasan/shadow.c:84)
usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338)
__usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657)
usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1741)
vhci_rx_loop (drivers/usb/usbip/vhci_rx.c:107 drivers/usb/usbip/vhci_rx.c:242)
kthread (kernel/kthread.c:436)
ret_from_fork (arch/x86/kernel/process.c:158)
ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
Allocated by task 10:
__kmalloc_cache_noprof (mm/slub.c:5563)
usb6fire_pcm_init (sound/usb/6fire/pcm.c:560 sound/usb/6fire/pcm.c:595)
usb6fire_chip_probe (sound/usb/6fire/chip.c:133)
usb_probe_interface (drivers/usb/core/driver.c:399)
The buggy address belongs to the object at ffff88802a3d0000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 0 bytes inside of
4832-byte region [ffff88802a3d0000, ffff88802a3d12e0)
Kernel panic - not syncing: Fatal exception in interrupt
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-2026-98312 的公开POC
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|---|
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CVE-2026-98312 补丁与修复 (5)
同批安全公告 · Linux · 2026-10-06 · 共 208 条
| CVE-2026-98323 | 9.8 CRITICAL | RDMA/siw 分片头拷贝边界漏洞 |
| CVE-2026-98365 | 9.8 CRITICAL | RDMA/rxe mr_check_range() 整数溢出导致越界访问漏洞 |
| CVE-2026-98282 | 8.8 HIGH | PowerPC IOMMU iommu_tce_check_ioba 溢出验证修复 |
| CVE-2026-98283 | 8.8 HIGH | KVM: PPC Book3S HV tlbie_all_lpid 使用后释放漏洞 |
| CVE-2026-98339 | 8.8 HIGH | cfg80211 移除过时条目时过滤BSS类型漏洞 |
| CVE-2026-98171 | 8.8 HIGH | smb 客户端修复复合 PDU 中 next_buffer UAF 及 NextCommand 越界漏洞 |
| CVE-2026-98261 | 8.1 HIGH | CIFS 服务器 cifs_chan_skip_or_disable() 函数中的使用后释放漏洞 |
| CVE-2026-98357 | 8.1 HIGH | IB/isert 释放连接前等待控制PDU完成漏洞 |
| CVE-2026-98239 | 8.1 HIGH | lan743x 网卡 RX 校验和使用后释放漏洞 |
| CVE-2026-98305 | 7.8 HIGH | mxl862xx 网络驱动在 teardown 时禁用统计轮询 |
| CVE-2026-98341 | 7.8 HIGH | WiFi: cfg80211驱动扫描请求释放漏洞 |
| CVE-2026-98320 | 7.8 HIGH | netfilter flowtable 在流释放前持有 ct 引用漏洞 |
| CVE-2026-98228 | 7.8 HIGH | MIPS EQE4 系统内核配置错误 |
| CVE-2026-98229 | 7.8 HIGH | Linux内核xfrm安全路径重置前保存输入状态数据 |
| CVE-2026-98318 | 7.8 HIGH | SMB客户端修复相对原生符号链接目标验证漏洞 |
| CVE-2026-98315 | 7.8 HIGH | NTFS运行列表更新缺少锁保护 |
| CVE-2026-98311 | 7.8 HIGH | virt_wifi 未注册前转移 operstate 漏洞 |
| CVE-2026-98276 | 7.8 HIGH | Linux 内核 sock_gettstamp 函数锁机制漏洞 |
| CVE-2026-98258 | 7.8 HIGH | Linux内核posix-cpu-timers释放过期列表定时器漏洞 |
| CVE-2026-98260 | 7.8 HIGH | exec 清理 POSIX 定时器漏洞 |
显示前 20 条，共 208 条。 查看全部 → →
IV. Related Vulnerabilities
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