gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
CVSS score
7.5
EPSS probability
%0.6
Risk score
0.0
Published
2 mo ago
Kanıt listesindeki ürün ve sürüm eşleşmesini kontrol edin; bazı varyantlar hâlâ etkileniyor olabilir.
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%61
Short explanation
A memory corruption vulnerability in the Linux kernel's gtp module, specifically in gtp1u_send_echo_resp(), can trigger a kernel panic when processing short echo requests. The issue is mitigated by specific kernel commit hashes, and versions up to 5.18 are affected. Higher versions are unaffected. Patch status is UNKNOWN due to lack of official confirmation.
This vulnerability can be exploited to cause a denial-of-service condition or system crash in systems using the GTP protocol, especially in network infrastructure where such protocols are common.
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
Linux çekirdeğinde, gtp1u_send_echo_resp() işlevi skb_pull_data() döndürdüğü değerini görmez. Kısa echo istekleri işlemede bu, skb->data işaretçisini skb->head'dan aşağıya taşımaya neden olabilir. Bu durum, skb_under_panic ile birlikte çekirdeğin bir hatası tetikleyebilir.
Bu ele geçirme, belirli Linux çekirdeği sürümlerinde etkilenir; 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 < b3c733eaae7f362601c28ac1533d47a961cd3e1c gibi commit hash'leri altındaki sürümler ve 5.18 sürümüne kadar etkilenir. 6.6.148 ve üzeri, 6.12.101 ve üzeri, 6.18.42 ve üzeri, 7.1.6 ve üzeri, 7.2-rc5 ve üzeri sürümler etkilenmez.
Yama değerlendirmesi BİLGİSİZ çünkü resmî kaynaklarda güvenilir bilgi yoktur. Resmî kaynaklarda bir yama durumu doğrulanmamıştır.
Show the technical text from the sources
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
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-64577 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.5 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CVE CNA |
| 7.5 | CVSS V31 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
1 düzeltme kanıtı bulundu; en az 3 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.
7.1.6-1Debian sid: 7.1.6-1
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64577 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64577 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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