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

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-07-14 12:44
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
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)
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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)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Show details on NVD website
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]------------\\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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido 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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": "2026-07-24T16:34:41Z",
      "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": "558",
      "product_status:known_not_affected": "30",
      "product_status:recommended": "344",
      "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": "31"
    },
    "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\": \"2026-07-14T12:44:37.987Z\", \"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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Taxonomy of the tags.





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.