gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
Summary
| CVE | CVE-2026-64577 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-05 08:16:37 UTC |
| Updated | 2026-08-05 08:16:37 UTC |
| Description | 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 |
Risk And Classification
EPSS: 0.001800000 probability, percentile 0.077800000 (date 2026-08-07)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 b3c733eaae7f362601c28ac1533d47a961cd3e1c git | Not specified |
| CNA | Linux | Linux | affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 4fc7923871d176ce0e5fecf4a9b7bb915af790ed git | Not specified |
| CNA | Linux | Linux | affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 961e9b1e33445f8e42859ecc020c9f60d8b69a8b git | Not specified |
| CNA | Linux | Linux | affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 cf45d748e437b8dd2dd987f27ee79c8c86f95c88 git | Not specified |
| CNA | Linux | Linux | affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 cd170f051dba9ac146fabcd1b91726487c0cb9fa git | Not specified |
| CNA | Linux | Linux | affected 5.18 | Not specified |
| CNA | Linux | Linux | unaffected 5.18 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc5 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/cd170f051dba9ac146fabcd1b91726487c0cb9fa | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b3c733eaae7f362601c28ac1533d47a961cd3e1c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/961e9b1e33445f8e42859ecc020c9f60d8b69a8b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cf45d748e437b8dd2dd987f27ee79c8c86f95c88 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4fc7923871d176ce0e5fecf4a9b7bb915af790ed | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.