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CVE-2026-64577— gtp: check skb_pull_data() return in gtp1u_send_echo_resp()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于drivers/net/gtp.c中gtp1u_send_echo_resp()函数忽略skb_pull_data()的返回值，可能导致内核崩溃。

CVSS 7.5 · High EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 9af41cc33471ea1efa6f77e188f055cc77d0a5c5< 9033fe49926f0e7421fefee922dc086417e905cf affected
9af41cc33471ea1efa6f77e188f055cc77d0a5c5< b3c733eaae7f362601c28ac1533d47a961cd3e1c affected
9af41cc33471ea1efa6f77e188f055cc77d0a5c5< 4fc7923871d176ce0e5fecf4a9b7bb915af790ed affected
9af41cc33471ea1efa6f77e188f055cc77d0a5c5< 961e9b1e33445f8e42859ecc020c9f60d8b69a8b affected
9af41cc33471ea1efa6f77e188f055cc77d0a5c5< cf45d748e437b8dd2dd987f27ee79c8c86f95c88 affected
9af41cc33471ea1efa6f77e188f055cc77d0a5c5< cd170f051dba9ac146fabcd1b91726487c0cb9fa affected
5.18 affected
< 5.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-64577

Vulnerability Information
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Vulnerability Title
gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于drivers/net/gtp.c中gtp1u_send_echo_resp()函数忽略skb_pull_data()的返回值，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 ~ 9033fe49926f0e7421fefee922dc086417e905cf -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-64577

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III. Intelligence Information for CVE-2026-64577

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Patches & Fixes for CVE-2026-64577 (6)

Same Patch Batch · Linux · 2026-08-05 · 17 CVEs total

CVE-2026-64566 9.8 CRITICAL xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()
CVE-2026-64578 8.2 HIGH ksmbd: validate compound request size before reading StructureSize2
CVE-2026-64567 7.8 HIGH btrfs: reject free space cache with more entries than pages
CVE-2026-64568 7.8 HIGH wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure
CVE-2026-64570 7.8 HIGH wifi: mac80211: fix fils_discovery double free on alloc failure
CVE-2026-64574 7.8 HIGH wifi: mac80211: tear down new links on vif update error path
CVE-2026-64575 7.8 HIGH bpf: tcp: fix double sock release on batch realloc
CVE-2026-64580 7.8 HIGH xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
CVE-2026-64581 7.8 HIGH xfrm: fix sk_dst_cache double-free in xfrm_user_policy()
CVE-2026-64582 7.8 HIGH RDMA/rxe: Fix a use-after-free problem in rxe_mmap
CVE-2026-64576 7.1 HIGH nexthop: initialize extack in nh_res_bucket_migrate()
CVE-2026-64569 mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
CVE-2026-64571 wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
CVE-2026-64572 ipv4: fib: free fib_alias with kfree_rcu() on insert error path
CVE-2026-64573 Bluetooth: qca: fix NVM tag length underflow in TLV parser
CVE-2026-64579 xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64577

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