CVE-2023-52509: ravb: Fix use-after-free issue in ravb_tx_timeout_work()

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ravb: Fix use-after-free issue in ravb_tx_timeout_work() The ravb_stop() should call cancel_work_sync(). Otherwise, ravb_tx_timeout_work() is possible to use the freed priv after ravb_remove() was called like below: CPU0 CPU1 ravb_tx_timeout() ravb_remove() unregister_netdev() free_netdev(ndev) // free priv ravb_tx_timeout_work() // use priv unregister_netdev() will call .ndo_stop() so that ravb_stop() is called. And, after phy_stop() is called, netif_carrier_off() is also called. So that .ndo_tx_timeout() will not be called after phy_stop().

Affected products

Linux kernel: from 4.2 before 5.4.259; from 5.5 before 5.10.199; from 5.11 before 5.15.136; from 5.16 before 6.1.59; from 6.2 before 6.5.8; 6.6-rc1, 6.6-rc2, 6.6-rc3, 6.6-rc4, 6.6-rc5 — fixed in 5.10.199, 5.15.136, 5.4.259, 6.1.59, 6.5.8

How to fix

Upgrade to a fixed version: Linux kernel 5.10.199, 5.15.136, 5.4.259, 6.1.59. Check the vendor advisory for mitigations.

References

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