{"id":"CVE-2021-3501","aliases":["ALSA-2021:2168","AZL-6569","DEBIAN-CVE-2021-3501","EUVD-2021-26821","GHSA-hvwc-6fg8-r6p5","RHSA-2021:2165","RHSA-2021:2168","RHSA-2021:2169","RHSA-2021:2522","RLSA-2021:2168","UBUNTU-CVE-2021-3501","USN-4983-1"],"status":"published","title":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the...","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. 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Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3501","tags":["web","advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210618-0008"},{"url":"https://github.com/advisories/GHSA-hvwc-6fg8-r6p5"},{"url":"https://vulners.com/cve/CVE-2021-3501","tags":["report"]},{"url":"https://vulners.com/cve/CVE-2021-3543","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-3501","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2165","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2165.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","report"]},{"url":"https://access.redhat.com/errata/RHSA-2021:2168","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1953022","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-2021-3543","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3543","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3543","tags":["advisory"]},{"url":"https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs@amazon.com/","tags":["article"]},{"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://access.redhat.com/errata/RHSA-2021:2522","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1903997","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1929858","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1961710","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1962650","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2522.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-24489","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-24489","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24489","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3560","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3560","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3560","tags":["advisory"]},{"url":"https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/","tags":["article"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-27219","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27219","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27219","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2021:2168","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-3501","tags":["report"]},{"url":"https://git.kernel.org/linus/04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7a","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4977-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4983-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-29155","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-31829","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-33200","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-3501","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-05T22:31:28Z","modified":"2026-08-05T21:23:05.44Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26821","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-05T22:31:28Z","modified":"2026-08-05T21:23:05Z","updated_at":"2026-11-02T18:02:09.520152Z"}],"ghsa":[{"id":"GHSA-hvwc-6fg8-r6p5","title":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the...","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2022-05-24T19:01:29Z","modified":"2026-08-06T00:31:27Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:10:08.59251Z"}],"nvd":[{"id":"CVE-2021-3501","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-06T13:15:12.84Z","modified":"2026-08-05T22:17:05.87Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":3.6,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:52.81233Z"}],"osv":[{"id":"AZL-6569","title":"CVE-2021-3501 affecting package kernel for versions less than 5.10.78.1-1","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-06T13:15:12Z","modified":"2026-04-21T04:37:40.018741Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"CVE-2021-3501","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-06T13:15:12.84Z","modified":"2026-03-15T22:40:59.634901Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-3501","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-06T13:15:12.84Z","modified":"2026-10-23T18:04:00.163722039Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"RHSA-2021:2165","title":"Red Hat Security Advisory: kpatch-patch security update","status":"published","published":"2024-09-13T20:25:41Z","modified":"2026-08-11T10:01:25Z","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-2021:2168","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":"RHSA-2021:2522","title":"Red Hat Security Advisory: Red Hat Virtualization Host security update [ovirt-4.4.6]","status":"published","published":"2024-09-16T05:59:44Z","modified":"2026-10-15T10:01:59Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"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-2021-3501","description":"A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.","status":"published","published":"2021-05-06T13:15:00Z","modified":"2026-02-04T02:54:28.391467Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"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-4983-1","title":"linux-oem-5.10 vulnerabilities","description":"Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel\ndid not properly enforce limits for pointer operations. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2021-33200)\n\nPiotr Krysiuk and Benedict Schlueter discovered that the eBPF\nimplementation in the Linux kernel performed out of bounds speculation on\npointer arithmetic. A local attacker could use this to expose sensitive\ninformation. (CVE-2021-29155)\n\nPiotr Krysiuk discovered that the eBPF implementation in the Linux kernel\ndid not properly prevent speculative loads in certain situations. A local\nattacker could use this to expose sensitive information (kernel memory).\n(CVE-2021-31829)\n\nReiji Watanabe discovered that the KVM VMX implementation in the Linux\nkernel did not properly prevent user space from tampering with an array\nindex value, leading to a potential out-of-bounds write. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2021-3501)\n","status":"published","published":"2021-06-03T20:43:59Z","modified":"2026-06-03T14:04:12.838862782Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}