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CVE-2025-71098

ip6_gre: make ip6gre_header() robust

Description

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

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 9 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-71098, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.14% · top 97% of all CVEs (9 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected c12b395a46646bab69089ce7016ac78177f6001f – < 17e7386234f740f3e7d5e58a47b5847ea34c3bc2
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < 41a1a3140aff295dee8063906f70a514548105e8
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < adee129db814474f2f81207bd182bf343832a52e
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < 1717357007db150c2d703f13f5695460e960f26c
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < 5fe210533e3459197eabfdbf97327dacbdc04d60
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < 91a2b25be07ce1a7549ceebbe82017551d2eec92
    • affected c12b395a46646bab69089ce7016ac78177f6001f – < db5b4e39c4e63700c68a7e65fc4e1f1375273476

  • Linux · Linux

    • affected 3.7
    • unaffected < 3.7
    • unaffected 5.10.248 – ≤ 5.10.*
    • unaffected 5.15.198 – ≤ 5.15.*
    • unaffected 6.1.160 – ≤ 6.1.*
    • unaffected 6.6.120 – ≤ 6.6.*
    • unaffected 6.12.64 – ≤ 6.12.*
    • unaffected 6.18.4 – ≤ 6.18.*
    • unaffected 6.19 – ≤ *

References

9

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .