CVE-2025-39873

HighCVSS 7.8/10Last modified Oct 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB

can_put_echo_skb() takes ownership of the SKB and it may be freed during or after the call.

However, xilinx_can xcan_write_frame() keeps using SKB after the call.

Fix that by only calling can_put_echo_skb() after the code is done touching the SKB.

The tx_lock is held for the entire xcan_write_frame() execution and also on the can_get_echo_skb() side so the order of operations does not matter.

An earlier fix commit 3d3c817c3a40 ("can: xilinx_can: Fix usage of skb memory") did not move the can_put_echo_skb() call far enough.

[mkl: add "commit" in front of sha1 in patch description] [mkl: fix indention]

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < e202ffd9e54538ef67ec301ebd6d9da4823466c9; >= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < 1139321161a3ba5e45e61e0738b37f42f20bc57a; >= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < 94b050726288a56a6b8ff55aa641f2fedbd3b44c; >= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < 725b33deebd6e4c96fe7893f384510a54258f28f; >= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < 668cc1e3bb21101d074e430de1b7ba8fd10189e7; >= 1598efe57b3e768056e4ca56cb9cf33111e68d1c, < ef79f00be72bd81d2e1e6f060d83cf7e425deee4
LinuxLinux4.19

References

Timeline

Published
Sep 23, 2025
Last modified
Oct 19, 2026
NVD status
Modified

Related CVEs from 2025

CVE-2025-398745.5In the Linux kernel, the following vulnerability has been resolved: macsec: sync features on RTM_NEWLINK Syzkaller managed to lock the lowCVE-2025-398755.5In the Linux kernel, the following vulnerability has been resolved: igb: Fix NULL pointer dereference in ethtool loopback test The igb driCVE-2025-398765.5In the Linux kernel, the following vulnerability has been resolved: net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable() ThCVE-2025-398777.8In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix use-after-free in state_show() state_show() reads CVE-2025-398785.5In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The funCVE-2025-398795.5In the Linux kernel, the following vulnerability has been resolved: ceph: always call ceph_shift_unused_folios_left() The function ceph_prCVE-2025-39888.8A vulnerability classified as critical has been found in TOTOLINK N150RT 3.4.0-B20190525. Affected is an unknown function of the file /boafrCVE-2025-398807.8In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a plCVE-2025-398817.8In the Linux kernel, the following vulnerability has been resolved: kernfs: Fix UAF in polling when open file is released A use-after-freeCVE-2025-398827.8In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: fix potential OF node use-after-free The for_each_child_CVE-2025-398837.1In the Linux kernel, the following vulnerability has been resolved: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoisonCVE-2025-398844.7In the Linux kernel, the following vulnerability has been resolved: btrfs: fix subvolume deletion lockup caused by inodes xarray race Ther
CVE-2025-39873: High severity, CVSS 7.8 | Vulnix