CVE-2020-12657
An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.
02 Description
An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.71% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 53.0% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-05-05 06:01Z6 YR AGO
- Last updated
- 2024-08-04 12:04Z2 YR AGO
- Reserved
- 2020-05-05
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.1
- Document digest
- 4765de34867859a1efb6e5d30e5f3d18176ab01ac8d61bfe8c46cca74442df8b
05 Affected products
06 References
- patchwork.kernel.orghttps://patchwork.kernel.org/patch/11447049/
- cdn.kernel.orghttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
- github.comhttps://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- git.kernel.orghttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- usn.ubuntu.comUSN-4367-1https://usn.ubuntu.com/4367-1/
- usn.ubuntu.comUSN-4368-1https://usn.ubuntu.com/4368-1/
- usn.ubuntu.comUSN-4363-1https://usn.ubuntu.com/4363-1/
- usn.ubuntu.comUSN-4369-1https://usn.ubuntu.com/4369-1/
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20200608-0001/
- lists.opensuse.orgopenSUSE-SU-2020:0801http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
07 Fixed in
Debian 12
- linux Fixed in 5.6.7-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.6.7-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.6.7-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux-aws-hwe Fixed in 4.15.0-1067.71~16.04.1
- linux-azure Fixed in 4.15.0-1083.93~16.04.1
- linux-gcp Fixed in 4.15.0-1071.81~16.04.1
- linux-hwe Fixed in 4.15.0-101.102~16.04.1
- linux-hwe-edge No fix yet
- linux-oracle Fixed in 4.15.0-1039.43~16.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- linux Fixed in 4.15.0-101.102
- linux-aws Fixed in 4.15.0-1067.71
- linux-aws-5.0 No fix yet
- linux-aws-5.3 Fixed in 5.3.0-1019.21~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1083.93
- linux-azure-5.3 Fixed in 5.3.0-1022.23~18.04.1
- linux-azure-edge No fix yet
- linux-gcp No fix yet
- linux-gcp-5.3 Fixed in 5.3.0-1020.22~18.04.1
- linux-gcp-edge No fix yet
- linux-gke-4.15 Fixed in 4.15.0-1059.62
- linux-gke-5.0 Fixed in 5.0.0-1037.38
- linux-gke-5.3 Fixed in 5.3.0-1020.22~18.04.1
- linux-hwe Fixed in 5.3.0-53.47~18.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.15.0-1060.61
- linux-oem Fixed in 4.15.0-1081.91
- linux-oem-osp1 Fixed in 5.0.0-1052.57
- linux-oracle Fixed in 4.15.0-1039.43
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 Fixed in 5.3.0-1018.20~18.04.1
- linux-raspi2 Fixed in 4.15.0-1062.66
- linux-raspi2-5.3 Fixed in 5.3.0-1026.28~18.04.1
- linux-snapdragon Fixed in 4.15.0-1079.86
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- linux Fixed in 5.4.0-31.35
- linux-aws Fixed in 5.4.0-1011.11
- linux-azure Fixed in 5.4.0-1012.12
- linux-azure-fde No fix yet
- linux-gcp Fixed in 5.4.0-1011.11
- linux-gke No fix yet
- linux-kvm Fixed in 5.4.0-1011.11
- linux-oem-5.6 Fixed in 5.6.0-1010.10
- linux-oracle Fixed in 5.4.0-1011.11
- linux-raspi Fixed in 5.4.0-1011.11
- linux-raspi2 No fix yet
- linux-riscv Fixed in 5.4.0-26.30
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux-intel-iot-realtime No fix yet
- linux-realtime No fix yet
- linux-riscv No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- linux-raspi-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- linux-azure Fixed in 4.15.0-1083.93~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2018.18Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2006.7Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1029.34Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 18.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.