CVE-2026-72489: staging: nvec: fix use-after-free in nvec_rx_completed()
In the Linux kernel, the following vulnerability has been resolved:
staging: nvec: fix use-after-free in nvecrxcompleted()
In nvecrxcompleted(), when an incomplete RX transfer is detected, nvecmsgfree() is called to return the message back to the pool by clearing its 'used' atomic flag. Immediately after this, the code accesses nvec->rx->data[0] to check the message type.
Since nvecmsgfree() marks the pool slot as available via atomicset(), any concurrent or subsequent call to nvecmsgalloc() could claim that same slot and overwrite its data[] array. Reading nvec->rx->data[0] after freeing the message is therefore a use-after-free.
Fix this by saving the message type byte before calling nvecmsgfree(), then using the saved value for the battery quirk check.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-38.38.1 - Compensating control
In nvec_rx_completed(), save the message type byte before calling nvec_msg_free(), then use the saved value for the battery quirk check instead of accessing nvec->rx->data[0] after freeing the message.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72489?
CVE-2026-72489 has a risk rating of 27, indicating a critical severity level.
How do I fix CVE-2026-72489?
To address CVE-2026-72489, update your Linux kernel to the latest version where the vulnerability has been patched.
What type of vulnerability is CVE-2026-72489?
CVE-2026-72489 is categorized as a Use After Free vulnerability.
Which function is affected by CVE-2026-72489?
The function affected by CVE-2026-72489 is nvec_rx_completed() in the staging: nvec subsystem.
What consequences can occur due to CVE-2026-72489?
CVE-2026-72489 can lead to potential application crashes or exploitation due to memory corruption.