CVE Catalog

CVE-2026-90115

Low risk· EPSS 10%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.21%

10th percentile - higher than 10% of all known CVEs

Summary

In the Linux kernel XDP socket (xsk) subsystem, __xsk_rcv() in the multi-buffer path calls xsk_buff_alloc() in a loop without checking its return value. When xsk_buff_alloc() returns NULL, a NULL pointer dereference causes a kernel crash. The fix introduces a two-stage buffer allocation transaction.

Risk Assessment

This can cause a kernel crash (oops/null-ptr-deref) and denial of service. The risk affects systems using XDP sockets with multi-buffer support.

Recommendation

Update the Linux kernel to a version with the fix. Restrict the ability to create XDP sockets to trusted users until the update is applied.

Related vulnerabilities

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: xsk: fix NULL pointer dereference in __xsk_rcv() In the __xsk_rcv() multi-buffer path, xsk_buff_alloc() is called in a loop without checking its return value. xsk_buff_can_alloc() only counts fill queue entries without validating their addresses, so it can succeed while xsk_buff_alloc() rejects all remaining entries and returns NULL. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:__xsk_rcv+0x426/0xc20 (net/xdp/xsk.c:350) Call Trace: xsk_generic_rcv+0x26d/0x5f0 xdp_do_generic_redirect+0x3c5/0xcf0 do_xdp_generic+0x92f/0xe70 __netif_receive_skb_core.constprop.0+0xf7e/0x2b30 Fix this with a two-stage transaction. First allocate and stage all buffers required for the packet, recycling all staged buffers with xsk_buff_free() if any allocation fails. Only after this stage succeeds, copy the data, reserve the RX descriptors, and release the buffers in an error-free loop.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS