CVE-2025-71098 (GCVE-0-2025-71098)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-09-08 08:43
VLAI
Title
ip6_gre: make ip6gre_header() robust
Summary
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 ! <TASK> 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
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c12b395a46646bab69089ce7016ac78177f6001f , < 17e7386234f740f3e7d5e58a47b5847ea34c3bc2 (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < 41a1a3140aff295dee8063906f70a514548105e8 (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < adee129db814474f2f81207bd182bf343832a52e (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < 1717357007db150c2d703f13f5695460e960f26c (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < 5fe210533e3459197eabfdbf97327dacbdc04d60 (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < 91a2b25be07ce1a7549ceebbe82017551d2eec92 (git)
Affected: c12b395a46646bab69089ce7016ac78177f6001f , < db5b4e39c4e63700c68a7e65fc4e1f1375273476 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:12:31+00:00",
      "cve": "CVE-2025-71098",
      "id": "CVE-2025-71098",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6_gre: make ip6gre_header() robust",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71098.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:48:09Z",
      "cve": "CVE-2025-71098",
      "id": "CVE-2025-71098",
      "initial_release_date": "2026-01-14T00:25:23Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "642",
      "product_status:known_not_affected": "30",
      "product_status:recommended": "326",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-71098",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-71098.json",
      "version": "33"
    },
    "vulnrichment": {
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mld_sendpack()\\nwas called, syzbot managed to attach an ip6gre device.\\n\\n[1]\\nskbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0\\n------------[ cut here ]------------\\n kernel BUG at net/core/skbuff.c:213 !\\n \u003cTASK\u003e\\n  skb_under_panic net/core/skbuff.c:223 [inline]\\n  skb_push+0xc3/0xe0 net/core/skbuff.c:2641\\n  ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371\\n  dev_hard_header include/linux/netdevice.h:3436 [inline]\\n  neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618\\n  neigh_output include/net/neighbour.h:556 [inline]\\n  ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136\\n __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]\\n  ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220\\n  NF_HOOK_COND include/linux/netfilter.h:307 [inline]\\n  ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247\\n  NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318\\n  mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855\\n  mld_send_cr net/ipv6/mcast.c:2154 [inline]\\n  mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.64\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.4\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:54:42.469Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-71098\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:43:51.924Z\", \"dateReserved\": \"2026-01-13T15:30:19.650Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-13T15:34:57.536Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.