{"id":"CVE-2020-36387","aliases":["DEBIAN-CVE-2020-36387","EUVD-2020-23918","GHSA-h865-4c46-jfqg","OESA-2021-1279","UBUNTU-CVE-2020-36387"],"status":"published","title":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free...","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00391,"percentile":0.33582,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2021-06-07T19:19:39Z","modified":"2026-10-26T12:02:02Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.7.17-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.7.17-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.7.17-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.17-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.17-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.17-1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.19.90-2107.4.0.0097.oe1"}]}],"bundled":12},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP2","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.19.90-2107.4.0.0097.oe1"}]}],"bundled":12},{"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","4.15.0-102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List","Patch","Release Notes","Vendor Advisory","fix","report"]},{"url":"https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix","report"]},{"url":"https://security.netapp.com/advisory/ntap-20210727-0006/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36387","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-h865-4c46-jfqg"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-36387","tags":["advisory"]},{"url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1279","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3587","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36385","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28097","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33624","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35039","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22555","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3573","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-0129","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34693","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3609","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3600","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-36387","tags":["report"]},{"url":"https://git.kernel.org/linus/6d816e088c359866f9867057e04f244c608c42fe","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-36387","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-36387","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T19:19:39Z","modified":"2024-08-04T17:23:10.565Z","updated_at":"2026-11-02T14:35:54.80237Z"}],"euvd":[{"id":"EUVD-2020-23918","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T19:19:39Z","modified":"2024-08-04T17:23:10Z","updated_at":"2026-11-03T03:07:03.484914Z"}],"ghsa":[{"id":"GHSA-h865-4c46-jfqg","title":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free...","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2022-05-24T19:04:12Z","modified":"2023-03-04T05:08:08Z","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":"2026-11-02T14:54:16.14777Z"}],"nvd":[{"id":"CVE-2020-36387","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T20:15:08.313Z","modified":"2026-06-17T03:15:23.217Z","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","assessor":"primary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:06:43.288951Z"}],"osv":[{"id":"CVE-2020-36387","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T20:15:08.313Z","modified":"2026-03-15T22:36:05.448298Z","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":"2026-11-02T15:44:16.936975Z"},{"id":"DEBIAN-CVE-2020-36387","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T20:15:08.313Z","modified":"2026-10-26T12:02:02.944600903Z","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":"2026-11-02T15:45:34.019707Z"},{"id":"OESA-2021-1279","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nthere was a null pointer dereference in llcp_sock_getname in net/nfc/llcp_sock.c and reproduced it in linux-5.13.0-rc2. An unprivileged user can trigger this bug and cause denial of service.  #Root Cause After creating an nfc socket, bind the address by calling bind(), if LLCP_SAP_MAX was used as SAP, it cause the bind() failed and there would set llcp_sock-\u0026gt;service_name  as NULL.  Although bind() returns an error here, it does not affect calling other socket functions. sock_getname() would invoke llcp_sock_getname(), llcp_sock_getname copied service  name from llcp_sock-\u0026gt;service_name by memcpy but llcp_sock-\u0026gt;service_name is NULL.  #Fix the patch for this issue: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=4ac06a1e013c(CVE-2021-3587)\r\n\r\nAn issue was discovered in the Linux kernel before 5.10. drivers/infiniband/core/ucma.c has a use-after-free because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is called, aka CID-f5449e74802c.(CVE-2020-36385)\r\n\r\nThe vgacon subsystem in the Linux kernel before 5.8.10 mishandles software scrollback. There is a vgacon_scrolldelta out-of-bounds read, aka CID-973c096f6a85.(CVE-2020-28097)\r\n\r\nIn kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.(CVE-2021-33624)\r\n\r\nkernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.(CVE-2021-35039)\r\n\r\nA heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space(CVE-2021-22555)\r\n\r\nA flaw use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user detaches bluetooth dongle or other way triggers unregister bluetooth device event. A local user could use this flaw to crash the system or escalate their privileges on the system.(CVE-2021-3573)\r\n\r\nImproper access control in BlueZ may allow an authenticated user to potentially enable information disclosure via adjacent access.(CVE-2021-0129)\r\n\r\nnet/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.(CVE-2021-34693)\r\n\r\nAn issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.(CVE-2020-36387)\r\n\r\nA flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges.(CVE-2021-3609)\r\n\r\nIt was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.(CVE-2021-3600)","status":"published","published":"2021-07-24T11:04:31Z","modified":"2026-08-18T01:15:49.282730461Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"UBUNTU-CVE-2020-36387","description":"An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.","status":"published","published":"2021-06-07T20:15:00Z","modified":"2025-10-24T04:49:00Z","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":"2026-11-02T15:54:25.179924Z"}]}}