CVE-2026-99039— memstick: core: wait for request completion before freeing card
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，以下漏洞已得到修复： memstick 子系统：核心模块在释放卡结构前等待请求完成 在 和 函数中，使用了 来等待设备识别和地址配置请求完成。 然而，memstick 子系统并未在 中为正在进行的请求提供中止或取消回调机制。如果 超时（例如，当 USB 传输或命令重试被延迟时）， 将返回错误，并通过 释放 结构体。 此时，主机控制器驱动程序（如 ）仍可能在 worker 上下文中异步执行该请求。当传输最终完成时，驱动程序会向 写入数据，而该指针指向的内存区域位于已被释放的卡结构体中。这导致
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | baf8532a147d5b76681ce040e2c8f25a3f0e718d< c3ab92542475d59ae685cbb294e70ca4d0ba38e9 |
affected |
baf8532a147d5b76681ce040e2c8f25a3f0e718d< 810580cf60edc75c9891c2de3225e4cda78e4d9f |
affected | ||
baf8532a147d5b76681ce040e2c8f25a3f0e718d< f2795c50144d528dabc2cf2fd53c0f0c63a823a1 |
affected | ||
baf8532a147d5b76681ce040e2c8f25a3f0e718d< 3af81770e2011c6ac7bb597a4af2e4f3591f928c |
affected | ||
baf8532a147d5b76681ce040e2c8f25a3f0e718d< aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582 |
affected | ||
2.6.25 |
affected | ||
< 2.6.25 |
unaffected | ||
6.6.160≤ 6.6.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-99039
Vulnerability Information
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Vulnerability Title
memstick: core: wait for request completion before freeing card
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
memstick: core: wait for request completion before freeing card
In memstick_alloc_card() and memstick_set_rw_addr(),
wait_for_completion_timeout() is used to wait for device identification
and address configuration requests to complete.
The memstick subsystem does not provide an abort or cancellation
callback in struct memstick_host for in-flight requests. If
wait_for_completion_timeout() expires (for instance, when a USB transfer
or command retry is delayed), memstick_alloc_card() returns an error and
frees the memstick_dev structure via kfree(card).
However, the host controller driver (such as rtsx_usb_ms) is still
running the request asynchronously in worker context. When the transfer
eventually finishes, the driver writes into host->req->data, which
points to memory inside the already freed card structure. This leads to
a KASAN slab-use-after-free write:
BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990
Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239
Workqueue: events rtsx_usb_ms_handle_req
Call Trace:
ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450
rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline]
rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
Allocated by task 1662:
memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline]
memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
Freed by task 1662:
kfree+0x20c/0x650 mm/slub.c:6792
memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline]
memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
Host controller drivers (rtsx_usb_ms, jmb38x_ms, tifm_ms, r592) already
implement their own hardware and bus timeouts, and callers in
mspro_block and ms_block already rely on wait_for_completion()
unconditionally.
Replace wait_for_completion_timeout() with wait_for_completion() in
memstick_set_rw_addr() and memstick_alloc_card() so that the card
structure is never freed while an asynchronous request is in flight.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-99039
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-99039 (5)
Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total
| CVE-2026-98959 | 9.8 CRITICAL | btrfs: fix xattr replace when multiple xattrs are packed in the same item |
| CVE-2026-99078 | 9.8 CRITICAL | net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry |
| CVE-2026-99079 | 9.8 CRITICAL | net/mlx5e: Prevent stale XSK buffer release on refill retry |
| CVE-2026-98988 | 8.8 HIGH | namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE |
| CVE-2026-99083 | 8.8 HIGH | ksmbd: fix heap out-of-bounds write in krb5_authenticate() |
| CVE-2026-99082 | 8.8 HIGH | KVM: x86: Use active memslots for the per-vCPU MMIO cache |
| CVE-2026-98981 | 8.8 HIGH | namespace: unhash a dentry before detaching the mounts on it |
| CVE-2026-98980 | 8.8 HIGH | namei: don't reveal overmounted entries in refwalk |
| CVE-2026-98870 | 8.8 HIGH | ksmbd: remove stale channels from all sessions on teardown |
| CVE-2026-98978 | 8.4 HIGH | namespace: never expire a locked mount |
| CVE-2026-99042 | 8.4 HIGH | io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6 |
| CVE-2026-98968 | 8.1 HIGH | amt: send the relay's General Query directly from the receive path |
| CVE-2026-99064 | 8.1 HIGH | cipso: adjust cached option offsets when removing CIPSO |
| CVE-2026-99014 | 7.8 HIGH | Bluetooth: hci_sync: Fix command skb lifetime during scan setup |
| CVE-2026-98999 | 7.8 HIGH | drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin |
| CVE-2026-99016 | 7.8 HIGH | riscv: futex: untag the user pointer before the atomic access |
| CVE-2026-99018 | 7.8 HIGH | riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp |
| CVE-2026-99051 | 7.8 HIGH | fsverity: RCU-delay the freeing of struct fsverity_info |
| CVE-2026-99054 | 7.8 HIGH | tipc: destroy topsrv workqueues before closing connections |
| CVE-2026-99053 | 7.8 HIGH | tipc: hold a reference to nodes found by link name |
Showing top 20 of 217 CVEs. View all on vendor page → →
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Same vendor: Linux
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CVE-2026-99099
x86/CPU/AMD: Fix AMD TLBI Erratum #1718 -
CVE-2026-99097
tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc -
CVE-2026-99098
dm-integrity: fix buffer overflow in inline mode with large -
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drm/vc4: drain the hangcheck timer and works on V3D unbind -
CVE-2026-99096
io_uring/register: don't exempt disabled rings from task res