CVE-2022-49376: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: sd: Fix potential NULL pointer dereference If sd_probe() sees an early error before sdkp->device is initialized, sd_zbc_release_disk() is called. This causes a NULL pointer dereference when sd_is_zoned() is called inside that function. Avoid this by removing the call to sd_zbc_release_disk() in sd_probe() error path. This change is safe and does not result in zone information memory leakage because the zone information for a zoned disk is allocated only when sd_revalidate_disk() is called, at which point sdkp->disk_dev is fully set, resulting in sd_disk_release() being called when needed to cleanup a disk zone information using sd_zbc_release_disk().

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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	4.10 — 5.10.122
linux	linux_kernel	5.11 — 5.15.47
linux	linux_kernel	5.16 — 5.17.15
linux	linux_kernel	5.18 — 5.18.4

References

Advisories & Patches

https://git.kernel.org/stable/c/05fbde3a77a4f1d62e4c4428f384288c1f1a0be5 https://git.kernel.org/stable/c/0fcb0b131cc90c8f523a293d84c58d0c7273c96f https://git.kernel.org/stable/c/3733439593ad12f7b54ae35c273ea6f15d692de3 https://git.kernel.org/stable/c/78f8e96df06e2d04d82d4071c299b59d28744f47 https://git.kernel.org/stable/c/c1f0187025905e9981000d44a92e159468b561a8

Frequently Asked Questions

What is CVE-2022-49376? +

In the Linux kernel, the following vulnerability has been resolved: scsi: sd: Fix potential NULL pointer dereference If sd_probe() sees an early error before sdkp->device is initialized, sd_zbc_release_disk() is called. This causes a NULL pointer dereference when sd_is_zoned() is called inside that function. Avoid this by removing the call to sd_zbc_release_disk() in sd_probe() error path. This change is safe and does not result in zone information memory leakage because the zone information for a zoned disk is allocated only when sd_revalidate_disk() is called, at which point sdkp->disk_dev is fully set, resulting in sd_disk_release() being called when needed to cleanup a disk zone information using sd_zbc_release_disk(). It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49376? +

CVE-2022-49376 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-2022-49376? +

CVE-2022-49376 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-2022-49376? +

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-2022-49376