CVE-2022-49688: linux kernel Null Dereference — Fix

Description

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

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.19.245 — 4.19.250
linux	linux_kernel	5.4.196 — 5.4.202
linux	linux_kernel	5.10.118 — 5.10.127
linux	linux_kernel	5.15.42 — 5.15.51
linux	linux_kernel	5.17.10 — 5.18
linux	linux_kernel	5.18.1 — 5.18.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2022-49688? +

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 It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49688? +

CVE-2022-49688 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-49688? +

CVE-2022-49688 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49688? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2022-49688