CVE-2022-49691 [Medium] | Security Vulnerability in Linux Kernel

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>

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-06	0.03%	0.05%	+0.02%
2	2025-11-27	0.08%	0.03%	-0.05%
3	2025-03-17	—	0.08%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-06

0.03%

0.05%

+0.02%

2025-11-27

0.08%

0.03%

-0.05%

2025-03-17

—

0.08%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2022-49691

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49691 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-49691
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49691
`suse`	medium	CVE-2022-49691 severity moderate: SUSE including 45 source package names (bpftool-4.18.0-477.10.1.el8_8, cluster-md-kmp-default, …), 180 product×package rows across 29 product lines (SUSE Liberty Linux 8, SUSE Linux Enterprise High Availability Extension 12 SP5, … (29 product lines)): Known Not Affected 160, Fixed 20.	https://www.suse.com/security/cve/CVE-2022-49691/
`ubuntu`	medium	CVE-2022-49691 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 146, released 135, not-affected 124, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49691

Affected software / configurations for CVE-2022-49691

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.18, < 4.19.250	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.202	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.127	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.51	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.18.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.19	cpe:2.3:o:linux:linux_kernel:5.19:rc1::::::
linux	linux_kernel	5.19	cpe:2.3:o:linux:linux_kernel:5.19:rc2::::::
linux	linux_kernel	5.19	cpe:2.3:o:linux:linux_kernel:5.19:rc3::::::

References for CVE-2022-49691

URL	Tags
https://git.kernel.org/stable/c/02da602bc2f353dccd9e489a604490034ded941e	Patch
https://git.kernel.org/stable/c/2c8aeffc7c586d53e1d380f010bdca4f710f2480	Patch
https://git.kernel.org/stable/c/301bd140ed0b24f0da660874c7e8a47dad8c8222	Patch
https://git.kernel.org/stable/c/a3b2470399f679587c45abe56e551caf10becca2	Patch
https://git.kernel.org/stable/c/cec9867ee55478ef5dcb2adf030fe0c442a4c4ee	Patch
https://git.kernel.org/stable/c/fb401f37f6eadf24956d93687e5758c163c0d12b	Patch

URL

CVE-2022-49691 | erspan: do not assume transport header is always set

Exploit prediction scoring system (EPSS) score for CVE-2022-49691

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49691

Weakness enumeration for CVE-2022-49691

OS Trackers for CVE-2022-49691

Affected software / configurations for CVE-2022-49691

References for CVE-2022-49691