Skip to content
Fencer Vulns
high 7.1

CVE-2021-47113 json

btrfs: abort in rename_exchange if we fail to insert the second ref

published 2024-03-15 2 y ago modified 2026-08-05 3 mo ago also EUVD-2021-33761

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

btrfs: abort in rename_exchange if we fail to insert the second ref

Error injection stress uncovered a problem where we'd leave a dangling inode ref if we failed during a rename_exchange. This happens because we insert the inode ref for one side of the rename, and then for the other side. If this second inode ref insert fails we'll leave the first one dangling and leave a corrupt file system behind. Fix this by aborting if we did the insert for the first inode ref.

Patch / fix

  • Linux Linux 5.10.43, 5.12.10, 5.13
  • linux Debian 14, Debian 13, Debian 12 5.10.46-1

debian advisories DEBIAN-CVE-2021-47113

  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.219.1
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.219.1
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.219.1
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.219.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.188.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.188.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.188.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.188.1

suse advisories SUSE-SU-2024:2184-1SUSE-SU-2024:1983-1SUSE-SU-2024:1650-1SUSE-SU-2024:1645-1SUSE-SU-2024:1643-1SUSE-SU-2024:1642-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-47113 updated cvss 5.5

kernel: btrfs: abort in rename_exchange if we fail to insert the second ref

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

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.