PT-2025-18593 · Linux+1 · Linux Kernel+1

Published 2025-05-01 · Updated 2025-05-02 · CVE-2022-49876

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A general-protection-fault issue occurs in the Linux kernel when the interface status is changed while the device is running. This issue is triggered by a race condition between two threads, where one thread sets sdata->bss to NULL while the other thread is still accessing sdata->bss->multicast to unicast. The problem arises because the sending queue continues to send packets after the interface status has been changed, leading to a null pointer dereference. The estimated number of potentially affected devices worldwide is not available. There is no information about real-world incidents where this issue was exploited.

Recommendations As a temporary workaround, consider disabling the ieee80211 subif start xmit() function until a patch is available. Restrict access to the vulnerable mac80211 module to minimize the risk of exploitation. Avoid using the sdata->bss variable in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-06058

CVE-2022-49876

Affected Products

Astra Linux

Linux Kernel

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49876.json · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-49876 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06058 · Security Note
• https://osv.dev/vulnerability/CVE-2022-49876 · Vendor Advisory
• https://git.kernel.org/stable/c/03eb68c72cee249aeb7af7d04a83c033aca3d6d9 · Patch
• https://git.kernel.org/stable/c/780854186946e0de2be192ee7fa5125666533b3a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2022-49876 · Security Note
• https://cve.org/CVERecord?id=CVE-2022-49876 · Security Note
• https://ubuntu.com/security/CVE-2022-49876 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-49876 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2022-49876 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/2025050152-CVE-2022-49876-498d@gregkh · Note
• https://twitter.com/CVEnew/status/1917950844605198817 · Twitter Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://access.redhat.com/security/cve/cve-2022-49876 · Note