CVE-2026-23011— ipv4: ip_gre: make ipgre_header() robust
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I. Basic Information for CVE-2026-23011
Vulnerability Information
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Vulnerability Title
ipv4: ip_gre: make ipgre_header() robust
Source: NVD (National Vulnerability Database)
Vulnerability Description
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
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于头空间不足，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-23011
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Same Patch Batch · Linux · 2026-01-25 · 20 CVEs total
| CVE-2026-23010 | 7.8 HIGH | ipv6: Fix use-after-free in inet6_addr_del(). |
| CVE-2026-22999 | 7.8 HIGH | net/sched: sch_qfq: do not free existing class in qfq_change_class() |
| CVE-2026-23004 | 7.8 HIGH | dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list() |
| CVE-2026-23001 | 7.8 HIGH | macvlan: fix possible UAF in macvlan_forward_source() |
| CVE-2026-22997 | 7.5 HIGH | net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the |
| CVE-2026-22998 | 7.5 HIGH | nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec |
| CVE-2026-23003 | 7.5 HIGH | ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv() |
| CVE-2026-23013 | 7.0 HIGH | net: octeon_ep_vf: fix free_irq dev_id mismatch in IRQ rollback |
| CVE-2025-71162 | dmaengine: tegra-adma: Fix use-after-free | |
| CVE-2025-71163 | dmaengine: idxd: fix device leaks on compat bind and unbind | |
| CVE-2026-22996 | net/mlx5e: Don't store mlx5e_priv in mlx5e_dev devlink priv | |
| CVE-2026-23000 | net/mlx5e: Fix crash on profile change rollback failure | |
| CVE-2026-23002 | lib/buildid: use __kernel_read() for sleepable context | |
| CVE-2026-23005 | x86/fpu: Clear XSTATE_BV[i] in guest XSAVE state whenever XFD[i]=1 | |
| CVE-2026-23006 | ASoC: tlv320adcx140: fix null pointer | |
| CVE-2026-23007 | block: zero non-PI portion of auto integrity buffer | |
| CVE-2026-23008 | drm/vmwgfx: Fix KMS with 3D on HW version 10 | |
| CVE-2026-23009 | xhci: sideband: don't dereference freed ring when removing sideband endpoint | |
| CVE-2026-23012 | mm/damon/core: remove call_control in inactive contexts |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-23011
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