CVE-2021-3348: debian debian_linux
Vulnerability summary
CVE-2021-3348 is a high (CVSS 7.0) vulnerability in debian debian_linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 18.3% of scored vulnerabilities.
Not severe (CVSS 7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 17 · Duplicates 1 · Related 12Timeline
- 01-02-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.26% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu47 products
- linux< 4.15.0-141.145 | < 5.4.0-71.79
- linux-aws< 4.15.0-1098.105 | < 5.4.0-1043.45
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1043.45~18.04.1
Suse18 products
- kernel-azure&distro=SUSE Linux Enterprise Server 12 SP5< 4.12.14-16.47.1
- kernel-azure&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 4.12.14-16.47.1
- kernel-default&distro=SUSE Linux Enterprise High Availability Extension 12 SP5< 4.12.14-122.63.1
- kernel-default&distro=SUSE Linux Enterprise Live Patching 12 SP5< 4.12.14-122.63.1
- kernel-default&distro=SUSE Linux Enterprise Server 12 SP5< 4.12.14-122.63.1
Debian2 products
- linux< 5.10.13-1
- debian_linuxEOL9.0
Linux1 product
- linux_kernel≤ 5.10.12
4 vendors · 68 products
References
83 links- www.openwall.com/lists/oss-security/2021/01/28/3X Refsource MISCREPORTMailing ListPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2021/02/01/1Mailing ListX Refsource MLISTPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlMailing ListX Refsource MLISTThird Party Advisory
