Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work Upon an MDIO… (CVE-2026-72411)
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work Upon an MDIO CRC error mxl862xx_crc_err_work_fn() walks the DSA ports and closes the CPU port conduits: dsa_switch_for_each_cpu_port(dp, priv->ds) dev_close(dp->conduit); mxl862xx_remove() unregisters the switch before cancelling this work: set_bit(MXL862XX_FLAG_WORK_STOPPED, &priv->flags); cancel_delayed_work_sync(&priv->stats_work); dsa_unregister_switch(ds); mxl862xx_host_shutdown(priv); dsa_unregister_switch() frees the dsa_port objects. If a CRC error schedules the work during teardown it can run after the ports have been freed and dereference freed memory. Guard the port walk with MXL862XX_FLAG_WORK_STOPPED, which is already set before dsa_unregister_switch(). DSA tears the ports down under rtnl_lock(), so checking the flag under rtnl_lock() means the work either runs before teardown and sees valid ports, or runs afterwards, observes the flag and skips the walk. This mirrors the host_flood_work handler, which skips torn-down ports under rtnl_lock().
AI Analysis
Technical Summary
CVE-2026-72411 addresses a use-after-free vulnerability in the Linux kernel's DSA mxl862xx driver. When an MDIO CRC error triggers mxl862xx_crc_err_work_fn(), it walks through DSA CPU ports and closes CPU port conduits. During teardown, mxl862xx_remove() unregisters the switch and frees dsa_port objects. If the CRC error schedules work after ports are freed, the work function dereferences freed memory, causing a use-after-free. The patch adds a guard flag (MXL862XX_FLAG_WORK_STOPPED) checked under rtnl_lock() to ensure the work either runs before teardown with valid ports or skips the walk if teardown has completed, preventing use-after-free.
Potential Impact
The vulnerability can cause the kernel to dereference freed memory, potentially leading to system instability or crashes. There is no indication of remote code execution or privilege escalation from the provided data. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to guard the work function with a flag that prevents use-after-free during teardown. Users should apply the official kernel updates that include this patch. Since no patch links or vendor advisory are provided here, check the Linux kernel mailing list or official kernel repositories for the relevant fix. No additional mitigation is indicated.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work Upon an MDIO… (CVE-2026-72411)
Description
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work Upon an MDIO CRC error mxl862xx_crc_err_work_fn() walks the DSA ports and closes the CPU port conduits: dsa_switch_for_each_cpu_port(dp, priv->ds) dev_close(dp->conduit); mxl862xx_remove() unregisters the switch before cancelling this work: set_bit(MXL862XX_FLAG_WORK_STOPPED, &priv->flags); cancel_delayed_work_sync(&priv->stats_work); dsa_unregister_switch(ds); mxl862xx_host_shutdown(priv); dsa_unregister_switch() frees the dsa_port objects. If a CRC error schedules the work during teardown it can run after the ports have been freed and dereference freed memory. Guard the port walk with MXL862XX_FLAG_WORK_STOPPED, which is already set before dsa_unregister_switch(). DSA tears the ports down under rtnl_lock(), so checking the flag under rtnl_lock() means the work either runs before teardown and sees valid ports, or runs afterwards, observes the flag and skips the walk. This mirrors the host_flood_work handler, which skips torn-down ports under rtnl_lock().
CVSS v3.1
Score 7.8high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-72411 addresses a use-after-free vulnerability in the Linux kernel's DSA mxl862xx driver. When an MDIO CRC error triggers mxl862xx_crc_err_work_fn(), it walks through DSA CPU ports and closes CPU port conduits. During teardown, mxl862xx_remove() unregisters the switch and frees dsa_port objects. If the CRC error schedules work after ports are freed, the work function dereferences freed memory, causing a use-after-free. The patch adds a guard flag (MXL862XX_FLAG_WORK_STOPPED) checked under rtnl_lock() to ensure the work either runs before teardown with valid ports or skips the walk if teardown has completed, preventing use-after-free.
Potential Impact
The vulnerability can cause the kernel to dereference freed memory, potentially leading to system instability or crashes. There is no indication of remote code execution or privilege escalation from the provided data. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to guard the work function with a flag that prevents use-after-free during teardown. Users should apply the official kernel updates that include this patch. Since no patch links or vendor advisory are provided here, check the Linux kernel mailing list or official kernel repositories for the relevant fix. No additional mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-426f-jh2p-2383
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-72411"]
Threat ID: 6a808b6fbf8831d5394fa7d7
Added to database: 08/15/2026, 15:53:19 UTC
Last enriched: 08/15/2026, 16:29:26 UTC
Last updated: 09/30/2026, 12:53:02 UTC
Views: 44
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