CVE-2026-31532
In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor. can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually]
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0Patch
- https://git.kernel.org/stable/c/1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3
- https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3aPatch
- https://git.kernel.org/stable/c/3f43f12fde34737fba091b7e3ab391e14ddbb0be
- https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358ePatch
- https://git.kernel.org/stable/c/5e9cfffad898bbeaafd0ea608a6d267362f050fcPatch
- https://git.kernel.org/stable/c/64c8553decf5a5f2417bd54761ea0a832c56c4ca
- https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffaPatch
- https://git.kernel.org/stable/c/a535a9217ca3f2fccedaafb2fddb4c48f27d36dcPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.