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bpf: Check skb->transport_header is set in bpf_skb_check_mtu

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Check skb->transport_header is set in bpf_skb_check_mtu The bpf_skb_check_mtu helper needs to use skb->transport_header when the BPF_MTU_CHK_SEGS flag is used: bpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS) The transport_header is not always set. There is a WARN_ON_ONCE report when CONFIG_DEBUG_NET is enabled + skb->gso_size is set + bpf_prog_test_run is used: WARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071 skb_gso_validate_network_len bpf_skb_check_mtu bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch bpf_test_run bpf_prog_test_run_skb For a normal ingress skb (not test_run), skb_reset_transport_header is performed but there is plan to avoid setting it as described in commit 2170a1f09148 ("net: no longer reset transport_header in __netif_receive_skb_core()"). This patch fixes the bpf helper by checking skb_transport_header_was_set(). The check is done just before skb->transport_header is used, to avoid breaking the existing bpf prog. The WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.

Announced Source revision 1
Original source ↗

CVE-2025-68363

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-2025-68363

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
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": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "b3171a5e4622e915e94599a55f4964078bdec27e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "97b876fa88322625228792cf7a5fd77531815a80",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "30ce906557a21adef4cba5901c8e995dc18263a9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "1c30e4afc5507f0069cc09bd561e510e4d97fbf7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34b2021cc61642d61c3cf943d9e71925b827941b",
        "lessThan": "d946f3c98328171fa50ddb908593cf833587f725",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "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": "5.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.120",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.63",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.13",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-68363

Source reference: /cveMetadata/cveId

Publisher severity

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Event
#27120 · Revision 1
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