CVE-2022-49688 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: afs: Fix dynamic root getattr The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd. Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr(). This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like: BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-06	0.03%	0.06%	+0.03%
2	2025-11-21	0.06%	0.03%	-0.03%
3	2025-11-18	—	0.06%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-06

0.03%

0.06%

+0.03%

2025-11-21

0.06%

0.03%

-0.03%

2025-11-18

—

0.06%

—

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-2022-49688

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49688 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-2022-49688
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2022-49688
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49688/
`ubuntu`	medium	CVE-2022-49688 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, not-affected 132, released 127, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49688

Affected software / configurations for CVE-2022-49688

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.19.245, < 4.19.250	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.4.196, < 5.4.202	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.10.118, < 5.10.127	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.15.42, < 5.15.51	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.17.10, < 5.18	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.18.1, < 5.18.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.18	cpe:2.3:o:linux:linux_kernel:5.18:-::::::
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-2022-49688

URL	Tags
https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce	Patch
https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d	Patch
https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b	Patch
https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4	Patch
https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb	Patch
https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b	Patch

URL

CVE-2022-49688 | afs: Fix dynamic root getattr

Exploit prediction scoring system (EPSS) score for CVE-2022-49688

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49688

Weakness enumeration for CVE-2022-49688

OS Trackers for CVE-2022-49688

Affected software / configurations for CVE-2022-49688

References for CVE-2022-49688