CVE-2025-21799: net: ethernet: ti: am65-cpsw: fix freeing IRQ in am65_cpsw_nuss_remove_tx_chns()
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: ti: am65-cpsw: fix freeing IRQ in am65cpswnussremovetxchns()
When getting the IRQ we use k3udmagluetxgetirq() which returns negative error value on error. So not NULL check is not sufficient to deteremine if IRQ is valid. Check that IRQ is greater then zero to ensure it is valid.
There is no issue at probe time but at runtime user can invoke .setchannels which results in the following call chain. am65cpswsetchannels() am65cpswnussupdatetxrxchns() am65cpswnussremovetxchns() am65cpswnussinittxchns()
At this point if am65cpswnussinittxchns() fails due to k3udmagluetxgetirq() then txchn->irq will be set to a negative value.
Then, at subsequent .setchannels with higher channel count we will attempt to free an invalid IRQ in am65cpswnussremovetxchns() leading to a kernel warning.
The issue is present in the original commit that introduced this driver, although there, am65cpswnussupdatetxrxchns() existed as am65cpswnussupdatetxchns().
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1089.98+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-140.150+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1083.92+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-64.67 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1032.34 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1034.39 - Upgrade
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ubuntu/linux-azure-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.15~24.04.1 - Upgrade
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ubuntu/linux-azure-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1022.23 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1033.35 - Upgrade
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ubuntu/linux-gcp-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.15~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1028.32 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1015.17 - Upgrade
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ubuntu/linux-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-26.26~24.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1029.29 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-64.67.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1014.15~24.04.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1031.34 - Upgrade
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ubuntu/linux-nvidia-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1010.10 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1031.34.1 - Upgrade
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ubuntu/linux-nvidia-tegrato a version that resolves this vulnerability.Fixed in 6.8.0-1008.8 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1031.35 - Upgrade
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ubuntu/linux-xilinxto a version that resolves this vulnerability.Fixed in 6.8.0-1017.18 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-78.78+fips1 - Compensating control
Validate that the IRQ returned by k3_udma_glue_tx_get_irq() is greater than zero before assigning, using, or freeing it in am65_cpsw_nuss_init_tx_chns() and am65_cpsw_nuss_remove_tx_chns().
Event History
Frequently Asked Questions
What is the severity of CVE-2025-21799?
CVE-2025-21799 carries a moderate severity level due to potential disruption in the Ethernet network functionality.
How do I fix CVE-2025-21799?
To fix CVE-2025-21799, you should upgrade to the patched version of the Linux kernel where this vulnerability has been addressed.
What is the impact of CVE-2025-21799?
The impact of CVE-2025-21799 includes possible denial of service in the Ethernet subsystems of affected Linux kernel versions.
Which systems are affected by CVE-2025-21799?
CVE-2025-21799 affects systems running the specified versions of the Linux kernel that use the Ethernet drivers, particularly for TI AM65 CPSW.
How was CVE-2025-21799 discovered?
CVE-2025-21799 was discovered through code review that identified an issue with IRQ handling in the Linux kernel's Ethernet module.