CVE-2026-64577

CVE CVE-2026-64577EUVD EUVD-2026-53271Published 2026-08-05T08:09:33.000ZLast changed 2026-08-08T15:13:14.000ZCVSS 7.5

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: gtp: check skb_pull_data() return in gtp1u_send_echo_resp() gtp1u_send_echo_resp() ignores skb_pull_data()'s return value. Its caller gtp1u_udp_encap_recv() only guarantees 16 bytes (udphdr + gtp1_header), but the pull requests 20 (gtp1_header_long + udphdr). For a 16-19 byte echo request the pull fails and returns NULL without advancing skb->data; execution continues, and the following skb_push() plus the IP header pushed by iptunnel_xmit() move skb->data below skb->head, tripping skb_under_panic(). Fix it by dropping the packet when skb_pull_data() fails. skbuff: skb_under_panic: ... kernel BUG at net/core/skbuff.c:214! Call Trace: skb_push (net/core/skbuff.c:2648) iptunnel_xmit (net/ipv4/ip_tunnel_core.c:82) gtp_encap_recv (drivers/net/gtp.c:701 drivers/net/gtp.c:808 drivers/net/gtp.c:920) udp_queue_rcv_one_skb (net/ipv4/udp.c:2388) ... Kernel panic - not syncing: Fatal exception in interrupt

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.18; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 <961e9b1e33445f8e42859ecc020c9f60d8b69a8b; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 <b3c733eaae7f362601c28ac1533d47a961cd3e1c; patch: 6.18.42; patch: 7.2-rc5; patch: 0; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 <4fc7923871d176ce0e5fecf4a9b7bb915af790ed; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 <cf45d748e437b8dd2dd987f27ee79c8c86f95c88; patch: 6.6.148; patch: 7.1.6; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 <cd170f051dba9ac146fabcd1b91726487c0cb9fa; patch: 6.12.101

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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