01 Record
CVE-2021-47185
tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc
MediumPUBLISHEDCNA: Linux
CNA base score4.4 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
02 Description
tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.17% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 7.0% of scored records. A rank, not a probability.
- NVD base score
- 4.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Low. 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
- 2024-04-10 18:56Z2 YR AGO
- Last updated
- 2026-05-11 13:49Z5 MO AGO
- Reserved
- 2024-03-25
- Assigning CNA
- Linux
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.4)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 266f18c34408c187af7cafc18b4210db21dbbc73fd3b3f8e2c731cd7a40baf41
05 Affected products
VendorProductVersionsPlatforms
LinuxLinux81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 0380f643f3a7a61b0845cdc738959c2ad5735d61, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 4c1623651a0936ee197859824cdae6ebbd04d3ed, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 4f300f47dbcf9c3d4b2ea76c8554c8f360400725, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < d491c84df5c469dd9621863b6a770b3428137063, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 5c34486f04700f1ba04907231dce0cc2705c2d7d, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 3968ddcf05fb4b9409cd1859feb06a5b0550a1c1, 3.0—
06 References
- git.kernel.orghttps://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61
- git.kernel.orghttps://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc
- git.kernel.orghttps://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed
- git.kernel.orghttps://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725
- git.kernel.orghttps://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063
- git.kernel.orghttps://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41
- git.kernel.orghttps://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d
- git.kernel.orghttps://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-553.5.1.el8_10
- kernel Fixed in 4.18.0-553.5.1.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.5.1.el8_10
- kernel-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- kernel-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-doc Fixed in 4.18.0-553.5.1.el8_10
- kernel-headers Fixed in 4.18.0-553.5.1.el8_10
- kernel-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- kernel-rt Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-core Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-tools Fixed in 4.18.0-553.5.1.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.5.1.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- perf Fixed in 4.18.0-553.5.1.el8_10
- python3-perf Fixed in 4.18.0-553.5.1.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- bpftool Fixed in 4.18.0-553.5.1.el8_10
- kernel Fixed in 4.18.0-553.5.1.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.5.1.el8_10
- kernel-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- kernel-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-doc Fixed in 4.18.0-553.5.1.el8_10
- kernel-headers Fixed in 4.18.0-553.5.1.el8_10
- kernel-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- kernel-rt Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-core Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.5.1.rt7.346.el8_10
- kernel-tools Fixed in 4.18.0-553.5.1.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.5.1.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.5.1.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.5.1.el8_10
- perf Fixed in 4.18.0-553.5.1.el8_10
- python3-perf Fixed in 4.18.0-553.5.1.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- linux Fixed in 5.15.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.15.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.15.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux-hwe-edge No fix yet
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 4.15.0-167.175
- linux-aws Fixed in 4.15.0-1119.127
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1064.67~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1131.144
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1068.71~18.04.1
- linux-azure-edge No fix yet
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1115.129
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1063.67~18.04.1
- linux-gke-4.15 No fix yet
- linux-gke-5.4 No fix yet
- linux-gkeop-5.4 No fix yet
- linux-hwe No fix yet
- linux-hwe-5.4 Fixed in 5.4.0-97.110~18.04.1
- linux-hwe-edge No fix yet
- linux-ibm-5.4 Fixed in 5.4.0-1014.15~18.04.1
- linux-kvm Fixed in 4.15.0-1106.108
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1086.94
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1062.66~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1052.58~18.04.1
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 5.4.0-97.110
- linux-aws Fixed in 5.4.0-1064.67
- linux-aws-5.11 No fix yet
- linux-aws-5.13 No fix yet
- linux-aws-5.8 No fix yet
- linux-azure Fixed in 5.4.0-1068.71
- linux-azure-5.11 No fix yet
- linux-azure-5.13 No fix yet
- linux-azure-5.8 No fix yet
- linux-azure-fde No fix yet
- linux-bluefield Fixed in 5.4.0-1026.29
- linux-gcp Fixed in 5.4.0-1063.67
- linux-gcp-5.11 No fix yet
- linux-gcp-5.13 No fix yet
- linux-gcp-5.8 No fix yet
- linux-gke No fix yet
- linux-gke-5.15 No fix yet
- linux-gkeop Fixed in 5.4.0-1032.33
- linux-hwe-5.11 No fix yet
- linux-hwe-5.13 No fix yet
- linux-hwe-5.8 No fix yet
- linux-ibm Fixed in 5.4.0-1013.14
- linux-intel-5.13 No fix yet
- linux-kvm Fixed in 5.4.0-1054.56
- linux-oem-5.10 No fix yet
- linux-oem-5.13 No fix yet
- linux-oem-5.14 No fix yet
- linux-oem-5.6 No fix yet
- linux-oracle Fixed in 5.4.0-1062.66
- linux-oracle-5.11 No fix yet
- linux-oracle-5.13 No fix yet
- linux-oracle-5.8 No fix yet
- linux-raspi Fixed in 5.4.0-1052.58
- linux-raspi2 No fix yet
- linux-riscv No fix yet
- linux-riscv-5.11 No fix yet
- linux-riscv-5.8 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux-allwinner-5.19 No fix yet
- linux-aws-5.19 No fix yet
- linux-aws-6.2 No fix yet
- linux-azure-5.19 No fix yet
- linux-azure-6.2 No fix yet
- linux-azure-fde-5.19 No fix yet
- linux-azure-fde-6.2 No fix yet
- linux-gcp-5.19 No fix yet
- linux-gcp-6.2 No fix yet
- linux-hwe-5.19 No fix yet
- linux-hwe-6.2 No fix yet
- linux-intel-iot-realtime No fix yet
- linux-lowlatency-hwe-5.19 No fix yet
- linux-lowlatency-hwe-6.2 No fix yet
- linux-nvidia-6.2 No fix yet
- linux-oem-5.17 No fix yet
- linux-oem-6.0 No fix yet
- linux-oem-6.1 No fix yet
- linux-realtime No fix yet
- linux-riscv No fix yet
- linux-riscv-5.19 No fix yet
- linux-starfive-5.19 No fix yet
- linux-starfive-6.2 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 No fix yet
- linux-aws No fix yet
- linux-azure Fixed in 4.15.0-1130.143~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- linux No fix yet
- linux-aws No fix yet
- linux-aws-hwe Fixed in 4.15.0-1119.126~16.04.2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1130.143~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1115.129~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-167.175~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm No fix yet
- linux-oracle Fixed in 4.15.0-1086.94~16.04.1Available 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 16.04 LTS
- linux-fips No fix yet
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 4.15.0-2060.62Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2042.46Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1076.85Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2025.27Available 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-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1069.73+fips2Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1073.76+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1041.47Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1067.71~20.04.1Available 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 16.04 LTS
- linux-fips No fix yet
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-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.
Ubuntu Pro FIPS 20.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-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.