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ipv4: ip_gre: make ipgre_header() robust

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_gre: make ipgre_header() robust Analog to commit db5b4e39c4e6 ("ip6_gre: make ip6gre_header() robust") Over the years, syzbot found many ways to crash the kernel in ipgre_header() [1]. This involves team or bonding drivers ability to dynamically change their dev->needed_headroom and/or dev->hard_header_len In this particular crash mld_newpack() allocated an skb with a too small reserve/headroom, and by the time mld_sendpack() was called, syzbot managed to attach an ipgre device. [1] skbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0 kernel BUG at net/core/skbuff.c:213 ! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: mld mld_ifc_work RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213 Call Trace: skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318 mld_sendpack+0x8d4/0xe60 net/ipv

Announced Source revision 1
Original source ↗

CVE-2026-23011

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-2026-23011

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": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "eeb9a521de40c6fadccc12fa5205e5a1b364d5a8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "8d5b6b2d79c1c22a5b0db1187a6439dff375a022",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "2ecf0aa7cc262472a9599cc51ba02ada0897a17a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "06fe0801396a36cab865b34f666de1d65bc5ce8e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "aa57bfea4674e6da8104fa3a37760a6f5f255dad",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "554201ed0a8f4d32e719f42caeaeb2735a9ed6ca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
        "lessThan": "e67c577d89894811ce4dcd1a9ed29d8b63476667",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/ip_gre.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.10",
        "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": "6.12.67",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.7",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/ip_gre.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23011

Source reference: /cveMetadata/cveId

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Event
#39730 · Revision 1
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