High 7.8Published Sep 23, 2025

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

Updated under an hour ago (Oct 26, 2026, 11:00 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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]

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1598efe57b3e768056e4ca56cb9cf33111e68d1c before e202ffd9e54538ef67ec301ebd6d9da4823466c9; from 1598efe57b3e768056e4ca56cb9cf33111e68d1c before 1139321161a3ba5e45e61e0738b37f42f20bc57a; 1598efe57b3e768056e4ca56cb9cf33111e68d1c builds before 94b050726288a56a6b8ff55aa641f2fedbd3b44c; 1598efe57b3e768056e4ca56cb9cf33111e68d1c builds before 725b33deebd6e4c96fe7893f384510a54258f28f; 1598efe57b3e768056e4ca56cb9cf33111e68d1c builds before 668cc1e3bb21101d074e430de1b7ba8fd10189e7; from 1598efe57b3e768056e4ca56cb9cf33111e68d1c before ef79f00be72bd81d2e1e6f060d83cf7e425deee4	CNA record
linux linux_kernel linux:linux_kernel	from 4.19 before 5.15.194; from 5.16 before 6.1.153; from 6.2 before 6.6.107; from 6.7 before 6.12.48; from 6.13 before 6.16.8; 6.17; 6.17; 6.17; and 2 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9	patch
https://git.kernel.org/stable/c/1139321161a3ba5e45e61e0738b37f42f20bc57a	patch
https://git.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44c	patch
https://git.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28f	patch
https://git.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7	patch
https://git.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.