CVE-2022-49802 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix null pointer dereference in ftrace_add_mod() The @ftrace_mod is allocated by kzalloc(), so both the members {prev,next} of @ftrace_mode->list are NULL, it's not a valid state to call list_del(). If kstrdup() for @ftrace_mod->{func|module} fails, it goes to @out_free tag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del() will write prev->next and next->prev, where null pointer dereference happens. BUG: kernel NULL pointer dereference, address: 0000000000000008 Oops: 0002 [#1] PREEMPT SMP NOPTI Call Trace: <TASK> ftrace_mod_callback+0x20d/0x220 ? do_filp_open+0xd9/0x140 ftrace_process_regex.isra.51+0xbf/0x130 ftrace_regex_write.isra.52.part.53+0x6e/0x90 vfs_write+0xee/0x3a0 ? __audit_filter_op+0xb1/0x100 ? auditd_test_task+0x38/0x50 ksys_write+0xa5/0xe0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Kernel panic - not syncing: Fatal exception So call INIT_LIST_HEAD() to initialize the list member to fix this issue.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-09	0.05%	0.04%	-0.01%
2	2026-02-25	0.03%	0.05%	+0.02%
3	2025-11-08	—	0.03%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-09

0.05%

0.04%

-0.01%

2026-02-25

0.03%

0.05%

+0.02%

2025-11-08

—

0.03%

—

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-2022-49802

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49802 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-2022-49802
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49802
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49802/
`ubuntu`	medium	CVE-2022-49802 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, released 154, ignored 146, not-affected 105, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49802

Affected software / configurations for CVE-2022-49802

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.13, < 4.14.300	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.267	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.225	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.156	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.80	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.0.10	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.1	cpe:2.3:o:linux:linux_kernel:6.1:rc1::::::
linux	linux_kernel	6.1	cpe:2.3:o:linux:linux_kernel:6.1:rc2::::::
linux	linux_kernel	6.1	cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::
linux	linux_kernel	6.1	cpe:2.3:o:linux:linux_kernel:6.1:rc4::::::
linux	linux_kernel	6.1	cpe:2.3:o:linux:linux_kernel:6.1:rc5::::::

References for CVE-2022-49802

URL	Tags
https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0	Patch
https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77	Patch
https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9	Patch
https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704	Patch
https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1	Patch
https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c	Patch
https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584	Patch

URL

CVE-2022-49802 | ftrace: Fix null pointer dereference in ftrace_add_mod()

Exploit prediction scoring system (EPSS) score for CVE-2022-49802

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49802

Weakness enumeration for CVE-2022-49802

OS Trackers for CVE-2022-49802

Affected software / configurations for CVE-2022-49802

References for CVE-2022-49802