{"id":"CVE-2021-47111","aliases":["DEBIAN-CVE-2021-47111","EUVD-2021-33759","GHSA-97vv-3jqh-r766","UBUNTU-CVE-2021-47111"],"status":"published","title":"xen-netback: take a reference to the RX task thread","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00237,"percentile":0.1479,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2024-03-15T20:14:19Z","modified":"2026-10-23T18:04:32Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.10.46-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.10.46-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.10.46-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-1021.24~18.04.1","5.0.0-1022.25~18.04.1","5.0.0-1023.26~18.04.1","5.0.0-1024.27~18.04.1","5.0.0-1025.28","5.0.0-1027.30"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-1016.17~18.04.1","5.3.0-1017.18~18.04.1","5.3.0-1019.21~18.04.1","5.3.0-1023.25~18.04.1","5.3.0-1028.30~18.04.1","5.3.0-1030.32~18.04.1","5.3.0-1032.34~18.04.2","5.3.0-1033.35","5.3.0-1034.36","5.3.0-1035.37"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-azure","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.15.0-1002.2","4.15.0-1003.3","4.15.0-1004.4","4.15.0-1008.8","4.15.0-1009.9","4.15.0-1012.12","4.15.0-1013.13","4.15.0-1014.14","4.15.0-1018.18","4.15.0-1019.19","4.15.0-1021.21","4.15.0-1022.23","4.15.0-1023.24","4.15.0-1025.26","4.15.0-1028.29","4.15.0-1030.31","4.15.0-1031.32","4.15.0-1032.33","4.15.0-1035.36","4.15.0-1036.38","4.15.0-1037.39","4.18.0-1011.11~18.04.1","4.18.0-1013.13~18.04.1","4.18.0-1014.14~18.04.1","4.18.0-1018.18~18.04.1","4.18.0-1019.19~18.04.1","4.18.0-1020.20~18.04.1","4.18.0-1023.24~18.04.1","4.18.0-1024.25~18.04.1","4.18.0-1025.27~18.04.1","5.0.0-1014.14~18.04.1","5.0.0-1016.17~18.04.1","5.0.0-1018.19~18.04.1","5.0.0-1020.21~18.04.1","5.0.0-1022.23~18.04.1","5.0.0-1023.24~18.04.1","5.0.0-1025.27~18.04.1","5.0.0-1027.29~18.04.1","5.0.0-1028.30~18.04.1","5.0.0-1029.31~18.04.1","5.0.0-1031.33","5.0.0-1032.34","5.0.0-1035.37","5.0.0-1036.38"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-azure-5.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-1007.8~18.04.1","5.3.0-1008.9~18.04.1","5.3.0-1009.10~18.04.1","5.3.0-1010.11~18.04.1","5.3.0-1012.13~18.04.1","5.3.0-1013.14~18.04.1","5.3.0-1016.17~18.04.1","5.3.0-1018.19~18.04.1","5.3.0-1019.20~18.04.1","5.3.0-1020.21~18.04.1","5.3.0-1022.23~18.04.1","5.3.0-1028.29~18.04.1","5.3.0-1031.32~18.04.1","5.3.0-1032.33~18.04.1","5.3.0-1034.35~18.04.1","5.3.0-1035.36"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-azure-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.18.0-1006.6~18.04.1","4.18.0-1007.7~18.04.1","4.18.0-1008.8~18.04.1","5.0.0-1012.12~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-gcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.15.0-1001.1","4.15.0-1003.3","4.15.0-1005.5","4.15.0-1006.6","4.15.0-1008.8","4.15.0-1009.9","4.15.0-1010.10","4.15.0-1014.14","4.15.0-1015.15","4.15.0-1017.18","4.15.0-1018.19","4.15.0-1019.20","4.15.0-1021.22","4.15.0-1023.24","4.15.0-1024.25","4.15.0-1025.26","4.15.0-1026.27","4.15.0-1027.28","4.15.0-1028.29","4.15.0-1029.31","4.15.0-1030.32","4.15.0-1032.34","4.15.0-1033.35","4.15.0-1034.36","4.15.0-1036.38","4.15.0-1037.39","4.15.0-1040.42","4.15.0-1042.45","4.15.0-1044.70","5.0.0-1020.20~18.04.1","5.0.0-1021.21~18.04.1","5.0.0-1025.26~18.04.1","5.0.0-1026.27~18.04.1","5.0.0-1028.29~18.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take a reference to the RX task thread","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T20:14:19.898Z","modified":"2026-08-05T08:46:04.618Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-33759","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T20:14:19Z","modified":"2026-08-05T08:46:04Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:02:22.159181Z"}],"ghsa":[{"id":"GHSA-97vv-3jqh-r766","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a...","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T21:30:43Z","modified":"2025-02-27T03:35:03Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:00:03.81346Z"}],"nvd":[{"id":"CVE-2021-47111","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T21:15:06.577Z","modified":"2026-08-04T10:16:46.46Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:08.163458Z"}],"osv":[{"id":"CVE-2021-47111","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T21:15:06.577Z","modified":"2026-03-15T22:43:05.282599Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:22.18434Z"},{"id":"DEBIAN-CVE-2021-47111","description":"In the Linux kernel, the following vulnerability has been resolved:  xen-netback: take a reference to the RX task thread  Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4.  Reintroduce the reference taking and add a comment this time explaining why it's needed.  This is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T21:15:06.577Z","modified":"2026-10-23T18:04:32.791077321Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:36.081807Z"},{"id":"UBUNTU-CVE-2021-47111","description":"In the Linux kernel, the following vulnerability has been resolved: xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691.","status":"published","published":"2024-03-15T21:15:00Z","modified":"2026-08-06T03:06:43.024101345Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:30.277322Z"}]}}