CVE-2025-39873
Full vulnerability record from the local CVENow database.
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]
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-23 06:15:46.670000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-23T06:15:46.670",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB\n\ncan_put_echo_skb() takes ownership of the SKB and it may be freed\nduring or after the call.\n\nHowever, xilinx_can xcan_write_frame() keeps using SKB after the call.\n\nFix that by only calling can_put_echo_skb() after the code is done\ntouching the SKB.\n\nThe tx_lock is held for the entire xcan_write_frame() execution and\nalso on the can_get_echo_skb() side so the order of operations does not\nmatter.\n\nAn earlier fix commit 3d3c817c3a40 (\"can: xilinx_can: Fix usage of skb\nmemory\") did not move the can_put_echo_skb() call far enough.\n\n[mkl: add \"commit\" in front of sha1 in patch description]\n[mkl: fix indention]"
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"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: xilinx_can: xcan_write_frame(): corregir uso después de liberación del SKB transmitido\n\ncan_put_echo_skb() toma posesión del SKB y este puede ser liberado durante o después de la llamada.\n\nSin embargo, xilinx_can xcan_write_frame() sigue usando el SKB después de la llamada.\n\nCorregir eso llamando a can_put_echo_skb() solo después de que el código haya terminado de manipular el SKB.\n\nEl tx_lock se mantiene durante toda la ejecución de xcan_write_frame() y también en el lado de can_get_echo_skb(), por lo que el orden de las operaciones no importa.\n\nUn commit de corrección anterior 3d3c817c3a40 ('can: xilinx_can: Corregir el uso de la memoria skb') no movió la llamada a can_put_echo_skb() lo suficientemente lejos.\n\n[mkl: añadir 'commit' delante de sha1 en la descripción del parche]\n[mkl: corregir sangría]"
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