🛡️ CVE-2022-49691 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

erspan: do not assume transport header is always set

In the Linux kernel, the following vulnerability has been resolved:

erspan: do not assume transport header is always set

Rewrite tests in ip6erspan_tunnel_xmit() and

erspan_fb_xmit() to not assume transport header is set.

syzbot reported:

WARNING: CPU: 0 PID: 1350 at include/linux/skbuff.h:2911 skb_transport_header include/linux/skbuff.h:2911 [inline]

WARNING: CPU: 0 PID: 1350 at include/linux/skbuff.h:2911 ip6erspan_tunnel_xmit+0x15af/0x2eb0 net/ipv6/ip6_gre.c:963

Modules linked in:

CPU: 0 PID: 1350 Comm: aoe_tx0 Not tainted 5.19.0-rc2-syzkaller-00160-g274295c6e53f #0

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014

RIP: 0010:skb_transport_header include/linux/skbuff.h:2911 [inline]

RIP: 0010:ip6erspan_tunnel_xmit+0x15af/0x2eb0 net/ipv6/ip6_gre.c:963

Code: 0f 47 f0 40 88 b5 7f fe ff ff e8 8c 16 4b f9 89 de bf ff ff ff ff e8 a0 12 4b f9 66 83 fb ff 0f 85 1d f1 ff ff e8 71 16 4b f9 <0f> 0b e9 43 f0 ff ff e8 65 16 4b f9 48 8d 85 30 ff ff ff ba 60 00

RSP: 0018:ffffc90005daf910 EFLAGS: 00010293

RAX: 0000000000000000 RBX: 000000000000ffff RCX: 0000000000000000

RDX: ffff88801f032100 RSI: ffffffff882e8d3f RDI: 0000000000000003

RBP: ffffc90005dafab8 R08: 0000000000000003 R09: 000000000000ffff

R10: 000000000000ffff R11: 0000000000000000 R12: ffff888024f21d40

R13: 000000000000a288 R14: 00000000000000b0 R15: ffff888025a2e000

FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000001b2e425000 CR3: 000000006d099000 CR4: 0000000000152ef0

Call Trace:

<TASK>

__netdev_start_xmit include/linux/netdevice.h:4805 [inline]

netdev_start_xmit include/linux/netdevice.h:4819 [inline]

xmit_one net/core/dev.c:3588 [inline]

dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3604

sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342

__dev_xmit_skb net/core/dev.c:3815 [inline]

__dev_queue_xmit+0x14a1/0x3900 net/core/dev.c:4219

dev_queue_xmit include/linux/netdevice.h:2994 [inline]

tx+0x6a/0xc0 drivers/block/aoe/aoenet.c:63

kthread+0x1e7/0x3b0 drivers/block/aoe/aoecmd.c:1229

kthread+0x2e9/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

</TASK>

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2022-49691 is recorded against 2 packages.

  • kernel (from 5.16.0 up to 5.18.8)
  • linux-kernel

Timeline and source

Published on 26 February 2025 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2022-49691 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-02-26
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 5.16.0 5.18.8
linux-kernel — —

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