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ip6_gre: make ip6gre_header() robust

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ip6_gre: make ip6gre_header() robust Over the years, syzbot found many ways to crash the kernel in ip6gre_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 ip6gre device. [1] skbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:213 ! skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220 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/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693

Announced Source revision 1
Original source ↗

CVE-2025-71098

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-2025-71098

Linux

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

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

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": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "17e7386234f740f3e7d5e58a47b5847ea34c3bc2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "41a1a3140aff295dee8063906f70a514548105e8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "adee129db814474f2f81207bd182bf343832a52e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "1717357007db150c2d703f13f5695460e960f26c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "5fe210533e3459197eabfdbf97327dacbdc04d60",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "91a2b25be07ce1a7549ceebbe82017551d2eec92",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c12b395a46646bab69089ce7016ac78177f6001f",
        "lessThan": "db5b4e39c4e63700c68a7e65fc4e1f1375273476",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_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": "3.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.248",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.198",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "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": "6.12.64",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_gre.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-71098

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#39151 · Revision 1
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Publisher date
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