PT-2026-34909 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-26 · CVE-2026-31557

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/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 recursive locking issue exists in the nvmet component. When the nvmet ctrl free() function flushes ctrl->async event work while running on the nvmet-wq workqueue, it causes the flush to re-enter workqueue completion for the same worker. This occurs through a chain where nvmet rdma release queue work() leads to nvmet ctrl free(), which then attempts to lock the same nvmet-wq completion lock already held by the process, potentially leading to a system deadlock.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-31557

ECHO-DEA7-DAB0-28C7

Affected Products

Linux Kernel

References · 15

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31557 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31557 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31557 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-31557 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31557 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31557 · Vendor Advisory
• https://git.kernel.org/stable/c/2922e3507f6d5caa7f1d07f145e186fc6f317a4e · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-31557 · Vendor Advisory
• https://git.kernel.org/stable/c/49c7c50ee6325a084216e94395e067ecde8088fa · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31557 · Vendor Advisory
• https://git.kernel.org/stable/c/25ceffc1dabec3b93f458b437aae26f4da293f87 · Patch
• https://git.kernel.org/stable/c/ca111c9d8d6c9d5735878d933a1716c4be86c2d1 · Patch
• https://twitter.com/CVEnew/status/2047798628656513083 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-31557 · Note
• https://git.kernel.org/linus/2922e3507f6d5caa7f1d07f145e186fc6f317a4e · Note