{"api_version":"1","generated_at":"2026-08-08T09:50:53+00:00","cve":"CVE-2026-64577","urls":{"html":"https://cve.report/CVE-2026-64577","api":"https://cve.report/api/cve/CVE-2026-64577.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64577","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64577"},"summary":{"title":"gtp: check skb_pull_data() return in gtp1u_send_echo_resp()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: check skb_pull_data() return in gtp1u_send_echo_resp()\n\ngtp1u_send_echo_resp() ignores skb_pull_data()'s return value. Its\ncaller gtp1u_udp_encap_recv() only guarantees 16 bytes (udphdr +\ngtp1_header), but the pull requests 20 (gtp1_header_long + udphdr). For\na 16-19 byte echo request the pull fails and returns NULL without\nadvancing skb->data; execution continues, and the following skb_push()\nplus the IP header pushed by iptunnel_xmit() move skb->data below\nskb->head, tripping skb_under_panic().\n\nFix it by dropping the packet when skb_pull_data() fails.\n\n  skbuff: skb_under_panic: ...\n  kernel BUG at net/core/skbuff.c:214!\n  Call Trace:\n   skb_push (net/core/skbuff.c:2648)\n   iptunnel_xmit (net/ipv4/ip_tunnel_core.c:82)\n   gtp_encap_recv (drivers/net/gtp.c:701 drivers/net/gtp.c:808 drivers/net/gtp.c:920)\n   udp_queue_rcv_one_skb (net/ipv4/udp.c:2388)\n   ...\n  Kernel panic - not syncing: Fatal exception in interrupt","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-05 08:16:37","updated_at":"2026-08-05 08:16:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cd170f051dba9ac146fabcd1b91726487c0cb9fa","name":"https://git.kernel.org/stable/c/cd170f051dba9ac146fabcd1b91726487c0cb9fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b3c733eaae7f362601c28ac1533d47a961cd3e1c","name":"https://git.kernel.org/stable/c/b3c733eaae7f362601c28ac1533d47a961cd3e1c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/961e9b1e33445f8e42859ecc020c9f60d8b69a8b","name":"https://git.kernel.org/stable/c/961e9b1e33445f8e42859ecc020c9f60d8b69a8b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cf45d748e437b8dd2dd987f27ee79c8c86f95c88","name":"https://git.kernel.org/stable/c/cf45d748e437b8dd2dd987f27ee79c8c86f95c88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4fc7923871d176ce0e5fecf4a9b7bb915af790ed","name":"https://git.kernel.org/stable/c/4fc7923871d176ce0e5fecf4a9b7bb915af790ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64577","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64577","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 b3c733eaae7f362601c28ac1533d47a961cd3e1c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 4fc7923871d176ce0e5fecf4a9b7bb915af790ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 961e9b1e33445f8e42859ecc020c9f60d8b69a8b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 cf45d748e437b8dd2dd987f27ee79c8c86f95c88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 cd170f051dba9ac146fabcd1b91726487c0cb9fa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc5 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64577","cve":"CVE-2026-64577","epss":"0.001800000","percentile":"0.077800000","score_date":"2026-08-07","updated_at":"2026-08-08 00:14:59"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/gtp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b3c733eaae7f362601c28ac1533d47a961cd3e1c","status":"affected","version":"9af41cc33471ea1efa6f77e188f055cc77d0a5c5","versionType":"git"},{"lessThan":"4fc7923871d176ce0e5fecf4a9b7bb915af790ed","status":"affected","version":"9af41cc33471ea1efa6f77e188f055cc77d0a5c5","versionType":"git"},{"lessThan":"961e9b1e33445f8e42859ecc020c9f60d8b69a8b","status":"affected","version":"9af41cc33471ea1efa6f77e188f055cc77d0a5c5","versionType":"git"},{"lessThan":"cf45d748e437b8dd2dd987f27ee79c8c86f95c88","status":"affected","version":"9af41cc33471ea1efa6f77e188f055cc77d0a5c5","versionType":"git"},{"lessThan":"cd170f051dba9ac146fabcd1b91726487c0cb9fa","status":"affected","version":"9af41cc33471ea1efa6f77e188f055cc77d0a5c5","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/gtp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.18"},{"lessThan":"5.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc5","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc5","versionStartIncluding":"5.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: check skb_pull_data() return in gtp1u_send_echo_resp()\n\ngtp1u_send_echo_resp() ignores skb_pull_data()'s return value. Its\ncaller gtp1u_udp_encap_recv() only guarantees 16 bytes (udphdr +\ngtp1_header), but the pull requests 20 (gtp1_header_long + udphdr). For\na 16-19 byte echo request the pull fails and returns NULL without\nadvancing skb->data; execution continues, and the following skb_push()\nplus the IP header pushed by iptunnel_xmit() move skb->data below\nskb->head, tripping skb_under_panic().\n\nFix it by dropping the packet when skb_pull_data() fails.\n\n  skbuff: skb_under_panic: ...\n  kernel BUG at net/core/skbuff.c:214!\n  Call Trace:\n   skb_push (net/core/skbuff.c:2648)\n   iptunnel_xmit (net/ipv4/ip_tunnel_core.c:82)\n   gtp_encap_recv (drivers/net/gtp.c:701 drivers/net/gtp.c:808 drivers/net/gtp.c:920)\n   udp_queue_rcv_one_skb (net/ipv4/udp.c:2388)\n   ...\n  Kernel panic - not syncing: Fatal exception in interrupt"}],"providerMetadata":{"dateUpdated":"2026-08-05T08:09:33.135Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b3c733eaae7f362601c28ac1533d47a961cd3e1c"},{"url":"https://git.kernel.org/stable/c/4fc7923871d176ce0e5fecf4a9b7bb915af790ed"},{"url":"https://git.kernel.org/stable/c/961e9b1e33445f8e42859ecc020c9f60d8b69a8b"},{"url":"https://git.kernel.org/stable/c/cf45d748e437b8dd2dd987f27ee79c8c86f95c88"},{"url":"https://git.kernel.org/stable/c/cd170f051dba9ac146fabcd1b91726487c0cb9fa"}],"title":"gtp: check skb_pull_data() return in gtp1u_send_echo_resp()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64577","datePublished":"2026-08-05T08:09:33.135Z","dateReserved":"2026-07-19T15:36:31.798Z","dateUpdated":"2026-08-05T08:09:33.135Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-05 08:16:37","lastModifiedDate":"2026-08-05 08:16:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64577","Ordinal":"1","Title":"gtp: check skb_pull_data() return in gtp1u_send_echo_resp()","CVE":"CVE-2026-64577","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64577","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: check skb_pull_data() return in gtp1u_send_echo_resp()\n\ngtp1u_send_echo_resp() ignores skb_pull_data()'s return value. Its\ncaller gtp1u_udp_encap_recv() only guarantees 16 bytes (udphdr +\ngtp1_header), but the pull requests 20 (gtp1_header_long + udphdr). For\na 16-19 byte echo request the pull fails and returns NULL without\nadvancing skb->data; execution continues, and the following skb_push()\nplus the IP header pushed by iptunnel_xmit() move skb->data below\nskb->head, tripping skb_under_panic().\n\nFix it by dropping the packet when skb_pull_data() fails.\n\n  skbuff: skb_under_panic: ...\n  kernel BUG at net/core/skbuff.c:214!\n  Call Trace:\n   skb_push (net/core/skbuff.c:2648)\n   iptunnel_xmit (net/ipv4/ip_tunnel_core.c:82)\n   gtp_encap_recv (drivers/net/gtp.c:701 drivers/net/gtp.c:808 drivers/net/gtp.c:920)\n   udp_queue_rcv_one_skb (net/ipv4/udp.c:2388)\n   ...\n  Kernel panic - not syncing: Fatal exception in interrupt","Type":"Description","Title":"gtp: check skb_pull_data() return in gtp1u_send_echo_resp()"}]}}}