CVE-2025-71098

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Source
https://cve.org/CVERecord?id=CVE-2025-71098
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71098.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-71098
Downstream
Related
Published
2026-01-13T15:34:57Z
Modified
2026-09-09T03:30:45Z
Summary
ip6_gre: make ip6gre_header() robust
Details

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

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71098.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c12b395a46646bab69089ce7016ac78177f6001f
Fixed
17e7386234f740f3e7d5e58a47b5847ea34c3bc2
Fixed
41a1a3140aff295dee8063906f70a514548105e8
Fixed
adee129db814474f2f81207bd182bf343832a52e
Fixed
1717357007db150c2d703f13f5695460e960f26c
Fixed
5fe210533e3459197eabfdbf97327dacbdc04d60
Fixed
91a2b25be07ce1a7549ceebbe82017551d2eec92
Fixed
db5b4e39c4e63700c68a7e65fc4e1f1375273476

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71098.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.7.0
Fixed
5.10.248
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.198
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.160
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.120
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.64
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71098.json"