CVE-2025-71098

MEDIUM EPSS 1.8%
Published Jan 13, 20265mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 13, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥3.7.1  –  <5.10.248
linuxlinux_kernel*≥5.11  –  <5.15.198
linuxlinux_kernel*≥5.16  –  <6.1.160
linuxlinux_kernel*≥6.2  –  <6.6.120
linuxlinux_kernel*≥6.7  –  <6.12.64
linuxlinux_kernel*≥6.13  –  <6.18.4
linuxlinux_kernel3.7any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/1717357007db150c2d703f13f5695460e960f26c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/17e7386234f740f3e7d5e58a47b5847ea34c3bc2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41a1a3140aff295dee8063906f70a514548105e8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5fe210533e3459197eabfdbf97327dacbdc04d60
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/91a2b25be07ce1a7549ceebbe82017551d2eec92
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/adee129db814474f2f81207bd182bf343832a52e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db5b4e39c4e63700c68a7e65fc4e1f1375273476
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1717357007db150c2d703f13f5695460e960f26c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/17e7386234f740f3e7d5e58a47b5847ea34c3bc2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41a1a3140aff295dee8063906f70a514548105e8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5fe210533e3459197eabfdbf97327dacbdc04d60
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/91a2b25be07ce1a7549ceebbe82017551d2eec92
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/adee129db814474f2f81207bd182bf343832a52e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db5b4e39c4e63700c68a7e65fc4e1f1375273476
    Patch