CVE-2026-53248 is a vulnerability in Linux Kernel
Published on June 25, 2026
net: airoha: Fix use-after-free in metadata dst teardown
In the Linux kernel, the following vulnerability has been resolved:
net: airoha: Fix use-after-free in metadata dst teardown
airoha_metadata_dst_free() runs metadata_dst_free() which frees the
metadata_dst with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, an use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.
Products Associated with CVE-2026-53248
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Affected Versions
Linux:- Version af3cf757d5c99011b9b94ea8d78aeaccc0153fdc and below 6f829e2c17a53a35321268339cd252aff6d6d723 is affected.
- Version af3cf757d5c99011b9b94ea8d78aeaccc0153fdc and below 4b5a574e033e66d2131eff1c18feef8d8643c67e is affected.
- Version af3cf757d5c99011b9b94ea8d78aeaccc0153fdc and below b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0 is affected.
- Version 6.15 is affected.
- Before 6.15 is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.