CVE-2022-49085 [High] | Use-After-Free in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: drbd: Fix five use after free bugs in get_initial_state In get_initial_state, it calls notify_initial_state_done(skb,..) if cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(), the skb will be freed by nlmsg_free(skb). Then get_initial_state will goto out and the freed skb will be used by return value skb->len, which is a uaf bug. What's worse, the same problem goes even further: skb can also be freed in the notify_*_state_change -> notify_*_state calls below. Thus 4 additional uaf bugs happened. My patch lets the problem callee functions: notify_initial_state_done and notify_*_state_change return an error code if errors happen. So that the error codes could be propagated and the uaf bugs can be avoid. v2 reports a compilation warning. This v3 fixed this warning and built successfully in my local environment with no additional warnings. v2: https://lore.kernel.org/patchwork/patch/1435218/

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-06	0.06%	0.01%	-0.04%
2	2025-06-28	0.04%	0.06%	+0.02%
3	2025-02-27	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-06

0.06%

0.01%

-0.04%

2025-06-28

0.04%

0.06%

+0.02%

2025-02-27

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

OS Trackers for CVE-2022-49085

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49085 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-2022-49085
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2022-49085
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49085/
`ubuntu`	medium	CVE-2022-49085 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 145, not-affected 115.	https://ubuntu.com/security/CVE-2022-49085

Affected software / configurations for CVE-2022-49085

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.5, < 4.9.311	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.10, < 4.14.276	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.238	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.189	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.111	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.34	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.16.20	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.17, < 5.17.3	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.18	cpe:2.3:o:linux:linux_kernel:5.18:rc1::::::

References for CVE-2022-49085

URL	Tags
https://git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103	Patch
https://git.kernel.org/stable/c/188fe6b26765edbad4055611c0f788b6870f4024	Patch
https://git.kernel.org/stable/c/226e993c39405292781bfcf4b039a8db56aab362	Patch
https://git.kernel.org/stable/c/594205b4936771a250f9d141e7e0fff21c3dd2d9	Patch
https://git.kernel.org/stable/c/a972c768723359ec995579902473028fe3cd64b1	Patch
https://git.kernel.org/stable/c/aadb22ba2f656581b2f733deb3a467c48cc618f6	Patch
https://git.kernel.org/stable/c/b6a4055036eed1f5e239ce3d8b0db1ce38bba447	Patch
https://git.kernel.org/stable/c/dcf6be17b5c53b741898d2223b23e66d682de300	Patch
https://git.kernel.org/stable/c/de63e74da2333b4068bb79983e632db730fea97e	Patch

URL

CVE-2022-49085 | drbd: Fix five use after free bugs in get_initial_state

Exploit prediction scoring system (EPSS) score for CVE-2022-49085

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49085

Weakness enumeration for CVE-2022-49085

OS Trackers for CVE-2022-49085

Affected software / configurations for CVE-2022-49085

References for CVE-2022-49085