{"id":"CVE-2021-4090","aliases":["AZL-8654","BELL-CVE-2021-4090","DEBIAN-CVE-2021-4090","EUVD-2021-33977","GHSA-rwxr-f4qj-9x36","UBUNTU-CVE-2021-4090","USN-5217-1","USN-5265-1","USN-5362-1"],"status":"published","title":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing...","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00339,"percentile":0.27697,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-12-13T00:00:00Z","modified":"2026-10-15T09:47:41Z","fixes":[{"ecosystem":"Azure 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out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T00:00:00Z","modified":"2026-10-14T10:04:03.126Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:33:08.045407Z"}],"euvd":[{"id":"EUVD-2021-33977","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T00:00:00Z","modified":"2026-10-14T10:04:03Z","updated_at":"2026-11-02T17:27:16.85534Z"}],"ghsa":[{"id":"GHSA-rwxr-f4qj-9x36","title":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing...","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-19T00:01:29Z","modified":"2026-08-25T21:31:14Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:10:58.645101Z"}],"nvd":[{"id":"CVE-2021-4090","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T18:15:10.207Z","modified":"2026-10-14T11:16:54.58Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":6.6,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:04.6896Z"}],"osv":[{"id":"AZL-8654","title":"CVE-2021-4090 affecting package kernel for versions less than 5.15.26.1-1","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T18:15:10Z","modified":"2026-04-21T04:34:53.878868Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:10.677811Z"},{"id":"BELL-CVE-2021-4090","title":"CVE-2021-4090 does not affect BellSoft software","status":"withdrawn","published":"2022-02-18T18:15:00Z","modified":"2026-01-26T09:46:33.677289Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:16.5265Z"},{"id":"CVE-2021-4090","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T18:15:10.207Z","modified":"2026-03-14T11:10:54.932563Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:21.249056Z"},{"id":"DEBIAN-CVE-2021-4090","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2022-02-18T18:15:10.207Z","modified":"2026-10-15T09:47:41.552751577Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-4090","description":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","status":"published","published":"2021-12-13T00:00:00Z","modified":"2026-02-04T02:47:09.646403Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:29.220315Z"},{"id":"USN-5217-1","title":"linux-oem-5.14 vulnerabilities","description":"It was discovered that the NFS server implementation in the Linux kernel\ncontained an out-of-bounds write vulnerability. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-4090)\n\nIt was discovered that the eBPF implementation in the Linux kernel did\nnot properly validate the memory size of certain ring buffer operation\narguments. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2021-4204)\n","status":"published","published":"2022-01-11T04:56:24Z","modified":"2026-02-10T04:42:25Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-5265-1","title":"linux, linux-aws, linux-aws-5.11, linux-aws-5.13, linux-azure-5.11, linux-gcp, linux-gcp-5.11, linux-hwe-5.13, linux-kvm, linux-oem-5.13, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities","description":"Jeremy Cline discovered a use-after-free in the nouveau graphics driver of\nthe Linux kernel during device removal. A privileged or physically\nproximate attacker could use this to cause a denial of service (system\ncrash). (CVE-2020-27820)\n\nIt was discovered that the Bluetooth subsystem in the Linux kernel\ncontained a use-after-free vulnerability. A local attacker could use this\nto cause a denial of service (system crash) or possibly execute arbitrary\ncode. (CVE-2021-3640)\n\nLikang Luo discovered that a race condition existed in the Bluetooth\nsubsystem of the Linux kernel, leading to a use-after-free vulnerability. A\nlocal attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code. (CVE-2021-3752)\n\nIt was discovered that the SCTP protocol implementation in the Linux kernel\ndid not properly verify VTAGs in some situations. A remote attacker could\npossibly use this to cause a denial of service (connection disassociation).\n(CVE-2021-3772)\n\nIt was discovered that the eBPF implementation in the Linux kernel\ncontained a race condition around read-only maps. A privileged attacker\ncould use this to modify read-only maps. (CVE-2021-4001)\n\nIt was discovered that the NFS server implementation in the Linux kernel\ncontained an out-of-bounds write vulnerability. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-4090)\n\nFelix Wilhelm discovered that the KVM implementation in the Linux kernel\ndid not properly handle exit events from AMD Secure Encrypted\nVirtualization-Encrypted State (SEV-ES) guest VMs. An attacker in a guest\nVM could use this to cause a denial of service (host kernel crash) or\npossibly execute arbitrary code in the host kernel. (CVE-2021-4093)\n\nLin Ma discovered that the NFC Controller Interface (NCI) implementation in\nthe Linux kernel contained a race condition, leading to a use-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2021-4202)\n\nIt was discovered that the AMD Radeon GPU driver in the Linux kernel did\nnot properly validate writes in the debugfs file system. A privileged\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-42327)\n\nLuo Likang discovered that the FireDTV Firewire driver in the Linux kernel\ndid not properly perform bounds checking in some situations. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-42739)\n","status":"published","published":"2022-02-03T05:40:51Z","modified":"2026-09-10T11:00:29.975906324Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-5362-1","title":"linux-intel-5.13 vulnerabilities","description":"Nick Gregory discovered that the Linux kernel incorrectly handled network\noffload functionality. A local attacker could use this to cause a denial of\nservice or possibly execute arbitrary code. (CVE-2022-25636)\n\nEnrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano\nGiuffrida discovered that hardware mitigations added by ARM to their\nprocessors to address Spectre-BTI were insufficient. A local attacker could\npotentially use this to expose sensitive information. (CVE-2022-23960)\n\nIt was discovered that the BPF verifier in the Linux kernel did not\nproperly restrict pointer types in certain situations. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2022-23222)\n\nMax Kellermann discovered that the Linux kernel incorrectly handled Unix\npipes. A local attacker could potentially use this to modify any file that\ncould be opened for reading. (CVE-2022-0847)\n\nYiqi Sun and Kevin Wang discovered that the cgroups implementation in the\nLinux kernel did not properly restrict access to the cgroups v1\nrelease_agent feature. A local attacker could use this to gain\nadministrative privileges. (CVE-2022-0492)\n\nWilliam Liu and Jamie Hill-Daniel discovered that the file system context\nfunctionality in the Linux kernel contained an integer underflow\nvulnerability, leading to an out-of-bounds write. A local attacker could\nuse this to cause a denial of service (system crash) or execute arbitrary\ncode. (CVE-2022-0185)\n\nEnrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano\nGiuffrida discovered that hardware mitigations added by Intel to their\nprocessors to address Spectre-BTI were insufficient. A local attacker could\npotentially use this to expose sensitive information. (CVE-2022-0001)\n\nJann Horn discovered a race condition in the Unix domain socket\nimplementation in the Linux kernel that could result in a read-after-free.\nA local attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code. (CVE-2021-4083)\n\nIt was discovered that the NFS server implementation in the Linux kernel\ncontained an out-of-bounds write vulnerability. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-4090)\n\nKirill Tkhai discovered that the XFS file system implementation in the\nLinux kernel did not calculate size correctly when pre-allocating space in\nsome situations. A local attacker could use this to expose sensitive\ninformation. (CVE-2021-4155)\n\nIt was discovered that the AMD Radeon GPU driver in the Linux kernel did\nnot properly validate writes in the debugfs file system. A privileged\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-42327)\n\nSushma Venkatesh Reddy discovered that the Intel i915 graphics driver in\nthe Linux kernel did not perform a GPU TLB flush in some situations. A\nlocal attacker could use this to cause a denial of service or possibly\nexecute arbitrary code. (CVE-2022-0330)\n\nSamuel Page discovered that the Transparent Inter-Process Communication\n(TIPC) protocol implementation in the Linux kernel contained a stack-based\nbuffer overflow. A remote attacker could use this to cause a denial of\nservice (system crash) for systems that have a TIPC bearer configured.\n(CVE-2022-0435)\n\nIt was discovered that the KVM implementation for s390 systems in the Linux\nkernel did not properly prevent memory operations on PVM guests that were\nin non-protected mode. A local attacker could use this to obtain\nunauthorized memory write access. (CVE-2022-0516)\n\nIt was discovered that the ICMPv6 implementation in the Linux kernel did\nnot properly deallocate memory in certain situations. A remote attacker\ncould possibly use this to cause a denial of service (memory exhaustion).\n(CVE-2022-0742)\n\nIt was discovered that the VMware Virtual GPU driver in the Linux kernel\ndid not properly handle certain failure conditions, leading to a stale\nentry in the file descriptor table. A local attacker could use this to\nexpose sensitive information or possibly gain administrative privileges.\n(CVE-2022-22942)\n","status":"published","published":"2022-04-01T01:11:38Z","modified":"2026-09-14T11:17:24.015261105Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}