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CVE-2025-38448— usb: gadget: u_serial: Fix race condition in TTY wakeup

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于TTY唤醒路径中的竞争条件问题。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 35f95fd7f234d2b58803bab6f6ebd6bb988050a2< 18d58a467ccf011078352d91b4d6a0108c7318e8 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< d43657b59f36e88289a6066f15bc9a80df5014eb affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< a5012673d49788f16bb4e375b002d7743eb642d9 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< ee8d688e2ba558f3bb8ac225113740be5f335417 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< c6eb4a05af3d0ba3bc4e8159287722fb9abc6359 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< abf3620cba68e0e51e5c21054ce4f925f75b3661 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< c8c80a3a35c2e3488409de2d5376ef7e662a2bf5 affected
35f95fd7f234d2b58803bab6f6ebd6bb988050a2< c529c3730bd09115684644e26bf01ecbd7e2c2c9 affected
… +10 more rows
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I. Basic Information for CVE-2025-38448

Vulnerability Information
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Vulnerability Title
usb: gadget: u_serial: Fix race condition in TTY wakeup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Fix race condition in TTY wakeup A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively. Use the null-safe TTY Port helper function to wake up TTY. Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于TTY唤醒路径中的竞争条件问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 ~ 18d58a467ccf011078352d91b4d6a0108c7318e8 -
Linux Linux 3.5 -

II. Public POCs for CVE-2025-38448

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III. Intelligence Information for CVE-2025-38448

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Same Patch Batch · Linux · 2025-07-25 · 114 CVEs total

CVE-2025-38429 10.0 CRITICAL bus: mhi: ep: Update read pointer only after buffer is written
CVE-2025-38430 9.8 CRITICAL nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request
CVE-2025-38411 9.8 CRITICAL netfs: Fix double put of request
CVE-2025-38439 9.8 CRITICAL bnxt_en: Set DMA unmap len correctly for XDP_REDIRECT
CVE-2025-38365 9.1 CRITICAL btrfs: fix a race between renames and directory logging
CVE-2025-38377 8.8 HIGH rose: fix dangling neighbour pointers in rose_rt_device_down()
CVE-2025-38367 8.8 HIGH LoongArch: KVM: Avoid overflow with array index
CVE-2025-38437 8.8 HIGH ksmbd: fix potential use-after-free in oplock/lease break ack
CVE-2025-38375 8.4 HIGH virtio-net: ensure the received length does not exceed allocated size
CVE-2025-38395 8.4 HIGH regulator: gpio: Fix the out-of-bounds access to drvdata::gpiods
CVE-2025-38449 7.8 HIGH drm/gem: Acquire references on GEM handles for framebuffers
CVE-2025-38453 7.8 HIGH io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
CVE-2025-38396 7.8 HIGH fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass
CVE-2025-38447 7.8 HIGH mm/rmap: fix potential out-of-bounds page table access during batched unmap
CVE-2025-38408 7.8 HIGH genirq/irq_sim: Initialize work context pointers properly
CVE-2025-38386 7.8 HIGH ACPICA: Refuse to evaluate a method if arguments are missing
CVE-2025-38412 7.8 HIGH platform/x86: dell-wmi-sysman: Fix WMI data block retrieval in sysfs callbacks
CVE-2025-38440 7.8 HIGH net/mlx5e: Fix race between DIM disable and net_dim()
CVE-2025-38382 7.8 HIGH btrfs: fix iteration of extrefs during log replay
CVE-2025-38416 7.8 HIGH NFC: nci: uart: Set tty->disc_data only in success path

Showing top 20 of 114 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38448

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