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bpf: Do not let BPF test infra emit invalid GSO types to stack

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Do not let BPF test infra emit invalid GSO types to stack Yinhao et al. reported that their fuzzer tool was able to trigger a skb_warn_bad_offload() from netif_skb_features() -> gso_features_check(). When a BPF program - triggered via BPF test infra - pushes the packet to the loopback device via bpf_clone_redirect() then mentioned offload warning can be seen. GSO-related features are then rightfully disabled. We get into this situation due to convert___skb_to_skb() setting gso_segs and gso_size but not gso_type. Technically, it makes sense that this warning triggers since the GSO properties are malformed due to the gso_type. Potentially, the gso_type could be marked non-trustworthy through setting it at least to SKB_GSO_DODGY without any other specific assumptions, but that also feels wrong given we should not go further into the GSO engine in the first place. The checks were added in 121d57af308d ("gso: validate gso_type in GSO handlers") because there were malicious (syzbot) senders that combine a protocol with a non-matching gso_type. If we would want to drop such packets, gso_features_check() currently only returns feature flags via netif_skb_features(), so one location for potentially dropping such skbs could be validate_xmit_unreadable_skb(), but then otoh it would be an additional check in the fast-path for a very corner case. Given bpf_clone_redirect() is the only place where BPF test infra could

Announced Source revision 1
Original source ↗

CVE-2025-68725

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-68725

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "bb7902ed7d7f6d6a7c6c4dc25410d6127ce1085f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "e0ffb64a2d72c6705b4a4c9efef600409f7e98a0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "768376ece7036ecb8604961793a1b72afe6345dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "8670b53b8ee91f028f7240531064020b7413c461",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "0f3a60869ca22024dfb9c6fce412b0c70cb4ea36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "fbea4c63b5385588cb44ab21f91e55e33c719a54",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "850a88cc4096fe1df407452ba2e4d28cf5b3eee9",
        "lessThan": "04a899573fb87273a656f178b5f920c505f68875",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bpf/test_run.c",
      "net/core/filter.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.249",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.199",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.162",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.122",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.68",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bpf/test_run.c",
      "net/core/filter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-68725

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27123 · Revision 1
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