CVE-2026-64577 (GCVE-0-2026-64577)

Vulnerability from cvelistv5 – Published: 2026-08-05 08:09 – Updated: 2026-08-05 08:09
VLAI
Title
gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
Summary
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 , < b3c733eaae7f362601c28ac1533d47a961cd3e1c (git)
Affected: 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 , < 4fc7923871d176ce0e5fecf4a9b7bb915af790ed (git)
Affected: 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 , < 961e9b1e33445f8e42859ecc020c9f60d8b69a8b (git)
Affected: 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 , < cf45d748e437b8dd2dd987f27ee79c8c86f95c88 (git)
Affected: 9af41cc33471ea1efa6f77e188f055cc77d0a5c5 , < cd170f051dba9ac146fabcd1b91726487c0cb9fa (git)
Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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()\u0027s 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-\u003edata; execution continues, and the following skb_push()\nplus the IP header pushed by iptunnel_xmit() move skb-\u003edata below\nskb-\u003ehead, 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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64577",
      "date": "2026-08-06",
      "epss": "0.0018",
      "percentile": "0.07792"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64577\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-05T08:16:37.630\",\"lastModified\":\"2026-08-05T08:16:37.630\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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()\u0027s 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-\u003edata; execution continues, and the following skb_push()\\nplus the IP header pushed by iptunnel_xmit() move skb-\u003edata below\\nskb-\u003ehead, 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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/gtp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9af41cc33471ea1efa6f77e188f055cc77d0a5c5\",\"lessThan\":\"b3c733eaae7f362601c28ac1533d47a961cd3e1c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9af41cc33471ea1efa6f77e188f055cc77d0a5c5\",\"lessThan\":\"4fc7923871d176ce0e5fecf4a9b7bb915af790ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9af41cc33471ea1efa6f77e188f055cc77d0a5c5\",\"lessThan\":\"961e9b1e33445f8e42859ecc020c9f60d8b69a8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9af41cc33471ea1efa6f77e188f055cc77d0a5c5\",\"lessThan\":\"cf45d748e437b8dd2dd987f27ee79c8c86f95c88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9af41cc33471ea1efa6f77e188f055cc77d0a5c5\",\"lessThan\":\"cd170f051dba9ac146fabcd1b91726487c0cb9fa\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/gtp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4fc7923871d176ce0e5fecf4a9b7bb915af790ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/961e9b1e33445f8e42859ecc020c9f60d8b69a8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3c733eaae7f362601c28ac1533d47a961cd3e1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd170f051dba9ac146fabcd1b91726487c0cb9fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf45d748e437b8dd2dd987f27ee79c8c86f95c88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T12:35:44+00:00",
      "cve": "CVE-2026-64577",
      "id": "CVE-2026-64577",
      "initial_release_date": "2026-08-05T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gtp: check skb_pull_data() return in gtp1u_send_echo_resp()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64577.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-06T01:06:18Z",
      "cve": "CVE-2026-64577",
      "id": "CVE-2026-64577",
      "initial_release_date": "2026-08-06T01:06:18Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64577",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64577.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.