CVE-2026-23011

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23011
In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_gre: make ipgre_header() robust Analog to commit db5b4e39c4e6 ("ip6_gre: make ip6gre_header() robust") Over the years, syzbot found many ways to crash the kernel in ipgre_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 ipgre device. [1] skbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0 kernel BUG at net/core/skbuff.c:213 ! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: mld mld_ifc_work RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213 Call Trace: <TASK> skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 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 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/06fe0801396a36cab865b34f666de1d65bc5ce8e Patch
https://git.kernel.org/stable/c/2ecf0aa7cc262472a9599cc51ba02ada0897a17a Patch
https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6ca Patch
https://git.kernel.org/stable/c/8d5b6b2d79c1c22a5b0db1187a6439dff375a022 Patch
https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dad Patch
https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667 Patch
https://git.kernel.org/stable/c/eeb9a521de40c6fadccc12fa5205e5a1b364d5a8 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.10:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
History

25 Mar 2026, 19:51

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: ipv4: ip_gre: hacer ipgre_header() robusto Análogo al commit db5b4e39c4e6 ('ip6_gre: hacer ip6gre_header() robusto') A lo largo de los años, syzbot encontró muchas maneras de colapsar el kernel en ipgre_header() [1]. Esto implica la capacidad de los controladores de equipo o de enlace (bonding drivers) de cambiar dinámicamente su dev-&gt;needed_headroom y/o dev-&gt;hard_header_len En este colapso particular, mld_newpack() asignó un skb con una reserva/espacio de cabecera (headroom) demasiado pequeño, y para cuando se llamó a mld_sendpack(), syzbot logró adjuntar un dispositivo ipgre. [1] skbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0 kernel BUG at net/core/skbuff.c:213 ! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: mld mld_ifc_work RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213 Call Trace: skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 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 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.10:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/06fe0801396a36cab865b34f666de1d65bc5ce8e - () https://git.kernel.org/stable/c/06fe0801396a36cab865b34f666de1d65bc5ce8e - Patch
References () https://git.kernel.org/stable/c/2ecf0aa7cc262472a9599cc51ba02ada0897a17a - () https://git.kernel.org/stable/c/2ecf0aa7cc262472a9599cc51ba02ada0897a17a - Patch
References () https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6ca - () https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6ca - Patch
References () https://git.kernel.org/stable/c/8d5b6b2d79c1c22a5b0db1187a6439dff375a022 - () https://git.kernel.org/stable/c/8d5b6b2d79c1c22a5b0db1187a6439dff375a022 - Patch
References () https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dad - () https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dad - Patch
References () https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667 - () https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667 - Patch
References () https://git.kernel.org/stable/c/eeb9a521de40c6fadccc12fa5205e5a1b364d5a8 - () https://git.kernel.org/stable/c/eeb9a521de40c6fadccc12fa5205e5a1b364d5a8 - Patch
First Time Linux
Linux linux Kernel
CWE NVD-CWE-noinfo

06 Feb 2026, 17:16

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/2ecf0aa7cc262472a9599cc51ba02ada0897a17a -
  • () https://git.kernel.org/stable/c/8d5b6b2d79c1c22a5b0db1187a6439dff375a022 -
  • () https://git.kernel.org/stable/c/eeb9a521de40c6fadccc12fa5205e5a1b364d5a8 -

30 Jan 2026, 10:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/06fe0801396a36cab865b34f666de1d65bc5ce8e -

25 Jan 2026, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-25 15:15

Updated : 2026-03-25 19:51

NVD link : CVE-2026-23011

Mitre link : CVE-2026-23011

CVE.ORG link : CVE-2026-23011

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo