Skip to content
Fencer Vulns
high 7.5

CVE-2023-49298 json

OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenarios involving applications that try to rely on efficient copying of file d…

published 2023-11-24 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-53284

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenarios involving applications that try to rely on efficient copying of file data, can replace file contents with zero-valued bytes and thus potentially disable security mechanisms. NOTE: this issue is not always security related, but can be security related in realistic situations. A possible example is cp, from a recent GNU Core Utilities (coreutils) version, when attempting to preserve a rule set for denying unauthorized access. (One might use cp when configuring access control, such as with the /etc/hosts.deny file specified in the IBM Support reference.) NOTE: this issue occurs less often in version 2.2.1, and in versions before 2.1.4, because of the default configuration in those versions.

Patch / fix

  • zfs-linux Debian 12 2.1.11-1+deb12u1
  • zfs-linux Debian 14, Debian 13 2.1.14-1

debian advisories DEBIAN-CVE-2023-49298

  • zfs-linux Ubuntu 20.04 LTS 0.8.3-1ubuntu12.17
  • zfs-linux Ubuntu 22.04 LTS 2.1.5-1ubuntu6~22.04.4
  • zfs-linux Ubuntu 24.04 LTS 2.2.2-0ubuntu2

ubuntu advisories UBUNTU-CVE-2023-49298

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zfs Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 2.2.1-r1
  • zfs-lts Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 2.2.1-r1
  • zfs-rpi Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 2.2.1-r1

alpine advisories ALPINE-CVE-2023-49298

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/openzfs/zfs/pull/15571 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/openzfs/zfs/issues/15526 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • openzfs openzfs

Classification

Weakness
  • CWE-639 Authorization Bypass Through User-Controlled Key

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.