USN-4916-2
linux, linux-aws, linux-gke-5.3, linux-hwe, linux-kvm, linux-lts-xenial, linux-oem-5.6, linux-raspi2, linux-raspi2-5.3, linux-snapdragon regression
USN-4916-1 fixed vulnerabilities in the Linux kernel. Unfortunately, the fix for CVE-2021-3493 introduced a memory leak in some situations. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493)
Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)
What each source reports
OSV No score
linux, linux-aws, linux-gke-5.3, linux-hwe, linux-kvm, linux-lts-xenial, linux-oem-5.6, linux-raspi2, linux-raspi2-5.3, linux-snapdragon regression
USN-4916-1 fixed vulnerabilities in the Linux kernel. Unfortunately, the fix for CVE-2021-3493 introduced a memory leak in some situations. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493)
Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)
- Record
USN-4916-2- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
linux-awsUbuntu:Pro:14.04:LTS |
before 4.4.0-1092.96, plus listed versions 4.4.0-1002.24.4.0-1003.34.4.0-1005.54.4.0-1006.64.4.0-1009.9 Show 45 moreShow less4.4.0-1010.104.4.0-1011.114.4.0-1012.124.4.0-1014.144.4.0-1016.164.4.0-1017.174.4.0-1019.194.4.0-1022.224.4.0-1023.234.4.0-1024.254.4.0-1025.264.4.0-1027.304.4.0-1028.314.4.0-1029.324.4.0-1031.344.4.0-1032.354.4.0-1034.374.4.0-1036.394.4.0-1037.404.4.0-1038.414.4.0-1039.424.4.0-1040.434.4.0-1042.454.4.0-1044.474.4.0-1045.484.4.0-1046.504.4.0-1048.524.4.0-1050.544.4.0-1052.564.4.0-1054.584.4.0-1055.594.4.0-1056.604.4.0-1058.624.4.0-1059.634.4.0-1060.644.4.0-1061.654.4.0-1062.664.4.0-1064.684.4.0-1065.694.4.0-1066.704.4.0-1067.714.4.0-1073.774.4.0-1074.784.4.0-1075.794.4.0-1076.80 |
4.4.0-1092.96 |
linux-lts-xenialUbuntu:Pro:14.04:LTS |
before 4.4.0-210.242~14.04.1, plus listed versions 4.4.0-13.29~14.04.14.4.0-14.30~14.04.24.4.0-15.31~14.04.14.4.0-18.34~14.04.14.4.0-21.37~14.04.1 Show 45 moreShow less4.4.0-22.39~14.04.14.4.0-22.40~14.04.14.4.0-24.43~14.04.14.4.0-28.47~14.04.14.4.0-31.50~14.04.14.4.0-34.53~14.04.14.4.0-36.55~14.04.14.4.0-38.57~14.04.14.4.0-42.62~14.04.14.4.0-45.66~14.04.14.4.0-47.68~14.04.14.4.0-51.72~14.04.14.4.0-53.74~14.04.14.4.0-57.78~14.04.14.4.0-59.80~14.04.14.4.0-62.83~14.04.14.4.0-63.84~14.04.24.4.0-64.85~14.04.14.4.0-66.87~14.04.14.4.0-67.88~14.04.14.4.0-70.91~14.04.14.4.0-71.92~14.04.14.4.0-72.93~14.04.14.4.0-75.96~14.04.14.4.0-78.99~14.04.24.4.0-79.100~14.04.14.4.0-81.104~14.04.14.4.0-83.106~14.04.14.4.0-87.110~14.04.14.4.0-89.112~14.04.14.4.0-91.114~14.04.14.4.0-92.115~14.04.14.4.0-93.116~14.04.14.4.0-96.119~14.04.14.4.0-97.120~14.04.14.4.0-98.121~14.04.14.4.0-101.124~14.04.14.4.0-103.126~14.04.14.4.0-104.127~14.04.14.4.0-108.131~14.04.14.4.0-109.132~14.04.14.4.0-111.134~14.04.14.4.0-112.135~14.04.14.4.0-116.140~14.04.14.4.0-119.143~14.04.1 |
4.4.0-210.242~14.04.1 |
linuxUbuntu:16.04:LTS |
before 4.4.0-210.242, plus listed versions 4.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.11 Show 45 moreShow less4.3.0-5.164.3.0-6.174.3.0-7.184.4.0-2.164.4.0-4.194.4.0-6.214.4.0-7.224.4.0-8.234.4.0-9.244.4.0-10.254.4.0-11.264.4.0-12.284.4.0-13.294.4.0-14.304.4.0-15.314.4.0-16.324.4.0-17.334.4.0-18.344.4.0-21.374.4.0-22.394.4.0-22.404.4.0-24.434.4.0-28.474.4.0-31.504.4.0-34.534.4.0-36.554.4.0-38.574.4.0-42.624.4.0-43.634.4.0-45.664.4.0-47.684.4.0-51.724.4.0-53.744.4.0-57.784.4.0-59.804.4.0-62.834.4.0-63.844.4.0-64.854.4.0-65.864.4.0-66.874.4.0-67.884.4.0-70.914.4.0-71.924.4.0-72.934.4.0-75.96 |
4.4.0-210.242 |
linux-awsUbuntu:16.04:LTS |
before 4.4.0-1128.142, plus listed versions 4.4.0-1001.104.4.0-1003.124.4.0-1004.134.4.0-1007.164.4.0-1009.18 Show 45 moreShow less4.4.0-1011.204.4.0-1012.214.4.0-1013.224.4.0-1016.254.4.0-1017.264.4.0-1018.274.4.0-1020.294.4.0-1022.314.4.0-1026.354.4.0-1028.374.4.0-1030.394.4.0-1031.404.4.0-1032.414.4.0-1035.444.4.0-1037.464.4.0-1038.474.4.0-1039.484.4.0-1041.504.4.0-1043.524.4.0-1044.534.4.0-1047.564.4.0-1048.574.4.0-1049.584.4.0-1050.594.4.0-1052.614.4.0-1054.634.4.0-1055.644.4.0-1057.664.4.0-1060.694.4.0-1061.704.4.0-1062.714.4.0-1063.724.4.0-1065.754.4.0-1066.764.4.0-1067.774.4.0-1069.794.4.0-1070.804.4.0-1072.824.4.0-1073.834.4.0-1074.844.4.0-1075.854.4.0-1077.874.4.0-1079.894.4.0-1081.914.4.0-1083.93 |
4.4.0-1128.142 |
linux-kvmUbuntu:16.04:LTS |
before 4.4.0-1093.102, plus listed versions 4.4.0-1004.94.4.0-1007.124.4.0-1008.134.4.0-1009.144.4.0-1010.15 Show 45 moreShow less4.4.0-1012.174.4.0-1013.184.4.0-1015.204.4.0-1017.224.4.0-1019.244.4.0-1020.254.4.0-1021.264.4.0-1023.284.4.0-1026.314.4.0-1027.324.4.0-1029.344.4.0-1031.374.4.0-1032.384.4.0-1033.394.4.0-1035.414.4.0-1036.424.4.0-1037.434.4.0-1038.444.4.0-1039.454.4.0-1040.464.4.0-1041.474.4.0-1043.494.4.0-1044.504.4.0-1046.524.4.0-1047.534.4.0-1048.554.4.0-1051.584.4.0-1052.594.4.0-1054.614.4.0-1056.634.4.0-1058.654.4.0-1059.664.4.0-1060.674.4.0-1062.694.4.0-1063.704.4.0-1064.714.4.0-1065.724.4.0-1066.734.4.0-1068.754.4.0-1069.764.4.0-1070.774.4.0-1071.784.4.0-1075.824.4.0-1076.834.4.0-1077.84 |
4.4.0-1093.102 |
linux-raspi2Ubuntu:16.04:LTS |
before 4.4.0-1152.163, plus listed versions 4.2.0-1013.194.2.0-1014.214.3.0-1006.64.4.0-1003.44.4.0-1004.5 Show 45 moreShow less4.4.0-1009.104.4.0-1010.124.4.0-1010.134.4.0-1012.164.4.0-1016.224.4.0-1017.234.4.0-1019.254.4.0-1021.274.4.0-1023.294.4.0-1027.334.4.0-1029.364.4.0-1034.414.4.0-1038.454.4.0-1040.474.4.0-1042.494.4.0-1044.514.4.0-1046.534.4.0-1048.554.4.0-1050.574.4.0-1051.584.4.0-1052.594.4.0-1054.614.4.0-1055.624.4.0-1057.644.4.0-1059.674.4.0-1061.694.4.0-1065.734.4.0-1067.754.4.0-1069.774.4.0-1070.784.4.0-1071.794.4.0-1074.824.4.0-1075.834.4.0-1076.844.4.0-1077.854.4.0-1079.874.4.0-1080.884.4.0-1082.904.4.0-1085.934.4.0-1086.944.4.0-1087.954.4.0-1089.974.4.0-1090.984.4.0-1091.994.4.0-1092.100 |
4.4.0-1152.163 |
linux-snapdragonUbuntu:16.04:LTS |
before 4.4.0-1156.166, plus listed versions 4.4.0-1012.124.4.0-1013.144.4.0-1013.154.4.0-1015.184.4.0-1019.22 Show 45 moreShow less4.4.0-1020.234.4.0-1022.254.4.0-1024.274.4.0-1026.294.4.0-1030.334.4.0-1032.364.4.0-1035.394.4.0-1039.434.4.0-1042.464.4.0-1044.484.4.0-1046.504.4.0-1047.514.4.0-1048.524.4.0-1050.544.4.0-1051.554.4.0-1053.574.4.0-1054.584.4.0-1055.594.4.0-1057.614.4.0-1058.624.4.0-1059.634.4.0-1061.664.4.0-1063.684.4.0-1067.724.4.0-1069.744.4.0-1071.764.4.0-1072.774.4.0-1073.784.4.0-1076.814.4.0-1077.824.4.0-1078.834.4.0-1079.844.4.0-1081.864.4.0-1082.874.4.0-1084.894.4.0-1087.924.4.0-1088.934.4.0-1090.954.4.0-1092.974.4.0-1093.984.4.0-1094.994.4.0-1095.1004.4.0-1096.1014.4.0-1098.1034.4.0-1099.104 |
4.4.0-1156.166 |
linux-gke-5.3Ubuntu:18.04:LTS |
before 5.3.0-1043.46, plus listed versions 5.3.0-1011.12~18.04.15.3.0-1012.13~18.04.15.3.0-1014.15~18.04.15.3.0-1016.17~18.04.15.3.0-1017.18~18.04.1 Show 13 moreShow less5.3.0-1018.19~18.04.15.3.0-1020.22~18.04.15.3.0-1026.28~18.04.15.3.0-1030.32~18.04.15.3.0-1032.34~18.04.15.3.0-1033.355.3.0-1034.365.3.0-1036.385.3.0-1038.405.3.0-1039.425.3.0-1040.435.3.0-1041.445.3.0-1042.45 |
5.3.0-1043.46 |
linux-hweUbuntu:18.04:LTS |
before 5.3.0-74.70, plus listed versions 4.18.0-13.14~18.04.14.18.0-14.15~18.04.14.18.0-15.16~18.04.14.18.0-16.17~18.04.14.18.0-17.18~18.04.1 Show 35 moreShow less4.18.0-18.19~18.04.14.18.0-20.21~18.04.14.18.0-21.22~18.04.14.18.0-22.23~18.04.14.18.0-24.25~18.04.14.18.0-25.26~18.04.15.0.0-23.24~18.04.15.0.0-25.26~18.04.15.0.0-27.28~18.04.15.0.0-29.31~18.04.15.0.0-31.33~18.04.15.0.0-32.34~18.04.25.0.0-35.38~18.04.15.0.0-36.39~18.04.15.0.0-37.40~18.04.15.3.0-26.28~18.04.15.3.0-28.30~18.04.15.3.0-40.32~18.04.15.3.0-42.34~18.04.15.3.0-45.37~18.04.15.3.0-46.38~18.04.15.3.0-51.44~18.04.25.3.0-53.47~18.04.15.3.0-59.53~18.04.15.3.0-61.55~18.04.15.3.0-62.56~18.04.15.3.0-64.58~18.04.15.3.0-65.595.3.0-66.605.3.0-67.615.3.0-68.635.3.0-69.655.3.0-70.665.3.0-72.685.3.0-73.69 |
5.3.0-74.70 |
linux-raspi2-5.3Ubuntu:18.04:LTS |
before 5.3.0-1040.42, plus listed versions 5.3.0-1017.19~18.04.15.3.0-1018.20~18.04.15.3.0-1019.21~18.04.15.3.0-1021.23~18.04.15.3.0-1022.24~18.04.1 Show 12 moreShow less5.3.0-1023.25~18.04.15.3.0-1026.28~18.04.15.3.0-1027.29~18.04.15.3.0-1028.30~18.04.25.3.0-1030.32~18.04.25.3.0-1032.345.3.0-1033.355.3.0-1035.375.3.0-1036.385.3.0-1037.395.3.0-1038.405.3.0-1039.41 |
5.3.0-1040.42 |
linux-oem-5.6Ubuntu:20.04:LTS |
before 5.6.0-1055.59, plus listed versions 5.6.0-1007.75.6.0-1008.85.6.0-1010.105.6.0-1011.115.6.0-1013.13 Show 22 moreShow less5.6.0-1017.175.6.0-1018.185.6.0-1020.205.6.0-1021.215.6.0-1023.235.6.0-1026.265.6.0-1027.275.6.0-1028.285.6.0-1031.325.6.0-1032.335.6.0-1033.355.6.0-1034.365.6.0-1035.375.6.0-1036.395.6.0-1039.435.6.0-1042.465.6.0-1047.515.6.0-1048.525.6.0-1050.545.6.0-1052.565.6.0-1053.575.6.0-1054.58 |
5.6.0-1055.59 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
USN-4916-2 is a vulnerability with no CVSS score yet in linux-aws, published April 22, 2021. No source lists public exploit code. Fixed in linux-aws 4.4.0-1092.96.
References
Left out here: 278 versions. The JSON record has them.