CVE-2026-53132

Summary

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: fix potential unbounded skb queue

virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc.

virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM.

If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0.

Fix this by estimating the skb metadata size:

(Number of skbs in the queue) * SKB_TRUESIZE(0)

Affected Software

VendorProductVersion RangeStatus
LinuxLinux077706165717686a2a6a71405fef036cd5b37ae0 < 1eca304f97a34ed5e921e1f0e06c8b241f25bf12affected
LinuxLinux077706165717686a2a6a71405fef036cd5b37ae0 < 9bdc637fde66b63d6cad0caacd034888bb7bf5f5affected
LinuxLinux077706165717686a2a6a71405fef036cd5b37ae0 < 100d5b2ffdc6468b9e48532641f29e83efdcb63caffected
LinuxLinux077706165717686a2a6a71405fef036cd5b37ae0 < 059b7dbd20a6f0c539a45ddff1573cb8946685b5affected
LinuxLinux5852a2b573f7a3a29df46296e56aa3491e589cdfaffected
LinuxLinux6.1.63 < 6.2affected
LinuxLinux6.3affected
LinuxLinux0 < 6.3unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References