What’s Vulnerable › Vulnerabilities

CVE-2021-3348

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-01 · updated 2026-06-17
• Weakness: CWE-362

Description

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.

Affected products

• Debian Linux: 9.0
• Linux kernel: through 5.10.12

References

• http://www.openwall.com/lists/oss-security/2021/02/01/1
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b98e762e3d71e893b221f871825dc64694cfb258
• https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
• https://www.openwall.com/lists/oss-security/2021/01/28/3
• http://www.openwall.com/lists/oss-security/2021/02/01/1
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b98e762e3d71e893b221f871825dc64694cfb258
• https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
• https://www.openwall.com/lists/oss-security/2021/01/28/3

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