{"id":"CVE-2021-3543","aliases":["ALSA-2021:2168","BELL-CVE-2021-3543","DEBIAN-CVE-2021-3543","EUVD-2021-26854","GHSA-5rp3-9frh-m3wx","RHSA-2021:2168","RHSA-2021:2169","RLSA-2021:2168","UBUNTU-CVE-2021-3543","USN-5001-1"],"status":"published","title":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that...","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","severity":{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00301,"percentile":0.23094,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416","CWE-476"],"published":"2021-06-01T09:02:01Z","modified":"2026-10-29T11:01:21Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.10.38-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.10.38-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.10.38-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.4","fixed_in":["5.4.0-1064.67~18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-aws","fixed_in":["5.4.0-1064.67"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-oem-5.10","fixed_in":["5.10.0-1032.33"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"AlmaLinux:8","package":"kernel-tools-libs-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.0-305.3.1.el8_4"}]}],"bundled":2},{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}]},{"source":"osv","ecosystem":"Red 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Advisory","report"]},{"url":"https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/","tags":["x_refsource_MISC","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3543","tags":["advisory"]},{"url":"https://lore.kernel.org/lkml/20210429165941.27020-1-andraprs@amazon.com/"},{"url":"https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs@amazon.com/","tags":["article"]},{"url":"https://github.com/advisories/GHSA-5rp3-9frh-m3wx"},{"url":"https://vulners.com/cve/CVE-2021-3501","tags":["report"]},{"url":"https://vulners.com/cve/CVE-2021-3543","tags":["report"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-3543","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-3543","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2168","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1950136","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2168.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3501","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3501","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3501","tags":["advisory"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7a","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3543","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3543","tags":["advisory","report"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2169","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2169.json","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2021:2168","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-3543","tags":["report"]},{"url":"https://git.kernel.org/linus/f1ce3986baa62cffc3c5be156994de87524bab99","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4997-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-5001-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4997-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-24586","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-24587","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-24588","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-26139","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-26141","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-26145","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-26147","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3506","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3609","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-23133","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-23134","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-31440","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-32399","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-33034","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-3543","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T13:20:34Z","modified":"2024-08-03T17:01:07.979Z","cwes":["CWE-416"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26854","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T13:20:34Z","modified":"2024-08-03T17:01:07Z","updated_at":"2026-11-03T03:25:12.535968Z"}],"ghsa":[{"id":"GHSA-5rp3-9frh-m3wx","title":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that...","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2022-05-24T19:03:43Z","modified":"2023-01-29T05:06:48Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:06.412268Z"}],"nvd":[{"id":"CVE-2021-3543","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T14:15:10.407Z","modified":"2026-06-17T04:05:19.13Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","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","CWE-476"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"BELL-CVE-2021-3543","title":"CVE-2021-3543 does not affect BellSoft software","status":"withdrawn","published":"2021-06-01T14:15:00Z","modified":"2026-01-26T09:45:45.003058Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:16.5265Z"},{"id":"CVE-2021-3543","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T14:15:10.407Z","modified":"2026-03-14T11:00:42.103324Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-3543","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T14:15:10.407Z","modified":"2026-10-23T18:03:14.13914699Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"RHSA-2021:2168","title":"Red Hat Security Advisory: kernel security and bug fix update","status":"published","published":"2024-09-13T20:26:02Z","modified":"2026-08-11T10:01:26Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2021:2169","title":"Red Hat Security Advisory: kernel-rt security and bug fix update","status":"published","published":"2024-09-13T20:25:47Z","modified":"2026-08-11T10:01:27Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"RLSA-2021:2168","title":"Important: kernel security and bug fix update","description":"The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: userspace applications can misuse the KVM API to cause a write of 16 bytes at an offset up to 32 GB from vcpu-\u003erun (CVE-2021-3501)\n\n* kernel: nitro_enclaves stale file descriptors on failed usercopy (CVE-2021-3543)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* OVS mistakenly using local IP as tun_dst for VXLAN packets (?) (BZ#1944667)\n\n* Selinux: The task calling security_set_bools() deadlocks with itself when it later calls  selinux_audit_rule_match(). (BZ#1945123)\n\n* [mlx5] tc flower mpls match options does not work (BZ#1952061)\n\n* mlx5: missing patches for ct.rel (BZ#1952062)\n\n* CT HWOL: with OVN/OVS, intermittently, load balancer hairpin TCP packets get dropped for seconds in a row (BZ#1952065)\n\n* [Lenovo 8.3 bug] Blackscreen after clicking on \"Settings\" icon from top-right corner. (BZ#1952900)\n\n* Rocky Linux 8.x missing uio upstream fix. (BZ#1952952)\n\n* Turbostat doesn't show any measured data on AMD Milan (BZ#1952987)\n\n* P620 no sound from front headset jack (BZ#1954545)\n\n* Rocky Linux kernel 8.2 and higher are affected by data corruption bug in raid1 arrays using bitmaps. (BZ#1955188)\n\n* [net/sched] connection failed with DNAT + SNAT by tc action ct (BZ#1956458)","status":"published","published":"2021-06-01T09:02:01Z","modified":"2026-02-05T03:00:10.999715Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2021-3543","description":"A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.","status":"published","published":"2021-06-01T14:15:00Z","modified":"2026-02-04T04:34:12.295553Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:27.870979Z"},{"id":"ALSA-2021:2168","title":"Important: kernel security and bug fix update","description":"The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: userspace applications can misuse the KVM API to cause a write of 16 bytes at an offset up to 32 GB from vcpu-\u003erun (CVE-2021-3501)\n\n* kernel: nitro_enclaves stale file descriptors on failed usercopy (CVE-2021-3543)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* OVS mistakenly using local IP as tun_dst for VXLAN packets (?) (BZ#1944667)\n\n* Selinux: The task calling security_set_bools() deadlocks with itself when it later calls  selinux_audit_rule_match(). (BZ#1945123)\n\n* [mlx5] tc flower mpls match options does not work (BZ#1952061)\n\n* mlx5: missing patches for ct.rel (BZ#1952062)\n\n* CT HWOL: with OVN/OVS, intermittently, load balancer hairpin TCP packets get dropped for seconds in a row (BZ#1952065)\n\n* [Lenovo 8.3 bug] Blackscreen after clicking on \"Settings\" icon from top-right corner. (BZ#1952900)\n\n* AlmaLinux 8.x missing uio upstream fix. (BZ#1952952)\n\n* Turbostat doesn't show any measured data on AMD Milan (BZ#1952987)\n\n* P620 no sound from front headset jack (BZ#1954545)\n\n* AlmaLinux kernel 8.2 and higher are affected by data corruption bug in raid1 arrays using bitmaps. (BZ#1955188)\n\n* [net/sched] connection failed with DNAT + SNAT by tc action ct (BZ#1956458)","status":"published","published":"2021-06-01T09:02:01Z","modified":"2026-10-29T11:01:21.728290056Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"USN-5001-1","title":"linux-oem-5.10 vulnerabilities","description":"Norbert Slusarek discovered a race condition in the CAN BCM networking\nprotocol of the Linux kernel leading to multiple use-after-free\nvulnerabilities. A local attacker could use this issue to execute arbitrary\ncode. (CVE-2021-3609)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation did\nnot properly clear received fragments from memory in some situations. A\nphysically proximate attacker could possibly use this issue to inject\npackets or expose sensitive information. (CVE-2020-24586)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation\nincorrectly handled encrypted fragments. A physically proximate attacker\ncould possibly use this issue to decrypt fragments. (CVE-2020-24587)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation\nincorrectly handled certain malformed frames. If a user were tricked into\nconnecting to a malicious server, a physically proximate attacker could use\nthis issue to inject packets. (CVE-2020-24588)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation\nincorrectly handled EAPOL frames from unauthenticated senders. A physically\nproximate attacker could inject malicious packets to cause a denial of\nservice (system crash). (CVE-2020-26139)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation did\nnot properly verify certain fragmented frames. A physically proximate\nattacker could possibly use this issue to inject or decrypt packets.\n(CVE-2020-26141)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation\naccepted plaintext fragments in certain situations. A physically proximate\nattacker could use this issue to inject packets. (CVE-2020-26145)\n\nMathy Vanhoef discovered that the Linux kernel’s WiFi implementation could\nreassemble mixed encrypted and plaintext fragments. A physically proximate\nattacker could possibly use this issue to inject packets or exfiltrate\nselected fragments. (CVE-2020-26147)\n\nOr Cohen discovered that the SCTP implementation in the Linux kernel\ncontained a race condition in some situations, leading to a use-after-free\ncondition. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2021-23133)\n\nOr Cohen and Nadav Markus discovered a use-after-free vulnerability in the\nnfc implementation in the Linux kernel. A privileged local attacker could\nuse this issue to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2021-23134)\n\nManfred Paul discovered that the extended Berkeley Packet Filter (eBPF)\nimplementation in the Linux kernel contained an out-of-bounds\nvulnerability. A local attacker could use this issue to execute arbitrary\ncode. (CVE-2021-31440)\n\nIt was discovered that a race condition in the kernel Bluetooth subsystem\ncould lead to use-after-free of slab objects. An attacker could use this\nissue to possibly execute arbitrary code. (CVE-2021-32399)\n\nIt was discovered that a use-after-free existed in the Bluetooth HCI driver\nof the Linux kernel. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2021-33034)\n\nIt was discovered that an out-of-bounds (OOB) memory access flaw existed in\nthe f2fs module of the Linux kernel. A local attacker could use this issue\nto cause a denial of service (system crash). (CVE-2021-3506)\n\nMathias Krause discovered that a null pointer dereference existed in the\nNitro Enclaves kernel driver of the Linux kernel. A local attacker could\nuse this issue to cause a denial of service or possibly execute arbitrary\ncode. (CVE-2021-3543)\n","status":"published","published":"2021-06-23T03:45:22Z","modified":"2026-06-03T14:03:57.327887772Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}