01 Record
CVE-2021-47321
watchdog: Fix possible use-after-free by calling del_timer_sync()
UnratedPUBLISHEDCNA: Linux
CNA base scoreUnratedNo CNA CVSS vector
02 Description
watchdog: Fix possible use-after-free by calling del_timer_sync()
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
- 0.24% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 15.8% 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
- Analyzed. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. 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
- 2024-05-21 14:35Z2 YR AGO
- Last updated
- 2026-05-11 13:52Z5 MO AGO
- Reserved
- 2024-05-21
- Assigning CNA
- Linux
- 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
- 5.2
- Document digest
- 501b9a1dd8fb7c718c8619749d7f365cfe6a23442d8f223341a06d3b3a41fe3f
05 Affected products
VendorProductVersionsPlatforms
LinuxLinux7c25f8c9f67708e6464d2221bc311cbd99e950dc to < 58606882ad8ec6c39e0f40344b922921ef94ab4d, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < ca96b8ea5e74956071154bdb456778cc3027e79f, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < 8bec568d7518b1504a602ed5376bb322e4dbb270, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < ecd620e0fb1ff7f78fdb593379b2e6938c99707a, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < db222f1477ad5692cd454709b714949807e5d111, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < 66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < 4c05dac488a660fe2925c047ecb119e7afaaeb1e, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < 1a053c4d716898a53c2e31c574a70ea0c37044a3, 7c25f8c9f67708e6464d2221bc311cbd99e950dc to < d0212f095ab56672f6f36aabc605bda205e1e0bf, 4.3—
06 References
- git.kernel.orghttps://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d
- git.kernel.orghttps://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f
- git.kernel.orghttps://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270
- git.kernel.orghttps://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a
- git.kernel.orghttps://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111
- git.kernel.orghttps://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4
- git.kernel.orghttps://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e
- git.kernel.orghttps://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3
- git.kernel.orghttps://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-553.22.1.el8_10
- kernel Fixed in 4.18.0-553.22.1.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.22.1.el8_10
- kernel-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- kernel-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-doc Fixed in 4.18.0-553.22.1.el8_10
- kernel-headers Fixed in 4.18.0-553.22.1.el8_10
- kernel-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- kernel-rt Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-core Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-tools Fixed in 4.18.0-553.22.1.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.22.1.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- perf Fixed in 4.18.0-553.22.1.el8_10
- python3-perf Fixed in 4.18.0-553.22.1.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 4.18.0-553.22.1.el8_10
- kernel Fixed in 4.18.0-553.22.1.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.22.1.el8_10
- kernel-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- kernel-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-doc Fixed in 4.18.0-553.22.1.el8_10
- kernel-headers Fixed in 4.18.0-553.22.1.el8_10
- kernel-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- kernel-rt Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-core Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.22.1.rt7.363.el8_10
- kernel-tools Fixed in 4.18.0-553.22.1.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.22.1.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.22.1.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.22.1.el8_10
- perf Fixed in 4.18.0-553.22.1.el8_10
- python3-perf Fixed in 4.18.0-553.22.1.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 5.14.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.14.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.14.6-1
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 4.15.0-156.163
- linux-aws Fixed in 4.15.0-1111.118
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1057.60~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1123.136
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1059.62~18.04.1
- linux-azure-edge No fix yet
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1108.122
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1053.57~18.04.1
- 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 5.4.0-87.98~18.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.15.0-1099.101
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1080.88
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1055.59~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1044.48~18.04.1
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 5.4.0-88.99
- linux-aws Fixed in 5.4.0-1057.60
- 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 5.4.0-1059.62
- 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 5.4.0-1019.22
- linux-gcp Fixed in 5.4.0-1053.57
- 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 5.4.0-1024.25
- 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 5.4.0-1005.6
- linux-intel-5.13 No fix yet
- linux-kvm Fixed in 5.4.0-1047.49
- 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 5.4.0-1055.59
- 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 5.4.0-1044.48
- 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-aws No fix yet
- linux-azure Fixed in 4.15.0-1123.136~14.04.1Available 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 4.15.0-1111.118~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1123.136~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1108.122~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-156.163~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm No fix yet
- linux-oracle Fixed in 4.15.0-1080.88~16.04.1Available 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 4.15.0-2053.55Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2035.39Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1069.78Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2018.20Available 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 5.4.0-1034.40Available 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.