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CVE-2025-39873— can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB

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xcan_write_frame函数在调用can_put_echo_skb后继续使用已释放的SKB，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 1598efe57b3e768056e4ca56cb9cf33111e68d1c< e202ffd9e54538ef67ec301ebd6d9da4823466c9 affected
1598efe57b3e768056e4ca56cb9cf33111e68d1c< 1139321161a3ba5e45e61e0738b37f42f20bc57a affected
1598efe57b3e768056e4ca56cb9cf33111e68d1c< 94b050726288a56a6b8ff55aa641f2fedbd3b44c affected
1598efe57b3e768056e4ca56cb9cf33111e68d1c< 725b33deebd6e4c96fe7893f384510a54258f28f affected
1598efe57b3e768056e4ca56cb9cf33111e68d1c< 668cc1e3bb21101d074e430de1b7ba8fd10189e7 affected
1598efe57b3e768056e4ca56cb9cf33111e68d1c< ef79f00be72bd81d2e1e6f060d83cf7e425deee4 affected
4.19 affected
< 4.19 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-39873

Vulnerability Information
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Vulnerability Title
can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
Source: CVE Program / CVE List V5
Vulnerability 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]
Source: 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
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xcan_write_frame函数在调用can_put_echo_skb后继续使用已释放的SKB，可能导致释放后重用。
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 1598efe57b3e768056e4ca56cb9cf33111e68d1c ~ e202ffd9e54538ef67ec301ebd6d9da4823466c9 -
Linux Linux 4.19 -

II. Public POCs for CVE-2025-39873

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III. Intelligence Information for CVE-2025-39873

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Patches & Fixes for CVE-2025-39873 (1)

Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39880 9.8 CRITICAL libceph: fix invalid accesses to ceph_connection_v1_info
CVE-2025-39869 8.4 HIGH dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39882 8.4 HIGH drm/mediatek: fix potential OF node use-after-free
CVE-2025-39888 7.8 HIGH fuse: Block access to folio overlimit
CVE-2025-39872 7.8 HIGH hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39868 7.8 HIGH erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39881 7.8 HIGH kernfs: Fix UAF in polling when open file is released
CVE-2025-39878 ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
CVE-2025-39887 tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
CVE-2025-39885 ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886 bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883 mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884 btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39879 ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39877 mm/damon/sysfs: fix use-after-free in state_show()
CVE-2025-39876 net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874 macsec: sync features on RTM_NEWLINK
CVE-2025-39875 igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39871 dmaengine: idxd: Remove improper idxd_free
CVE-2025-39870 dmaengine: idxd: Fix double free in idxd_setup_wqs()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39873

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