{"id":"CVE-2021-33630","aliases":["DEBIAN-CVE-2021-33630","DLA-3840-1","EUVD-2021-20307","GHSA-4mwf-4888-4x35","OESA-2024-1030","OESA-2024-1031","RHSA-2020:1567","RHSA-2020:1769","UBUNTU-CVE-2021-33630"],"status":"published","title":"NULL-ptr-deref in network sched","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C.\n\nThis issue affects openEuler kernel: from 4.19.90 before 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This vulnerability is associated with program files net/sched/sch_cbs.C.\n\nThis issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.","status":"published","published":"2024-01-18T15:00:49Z","modified":"2025-05-07T20:14:53Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T20:32:52.670412Z"}],"ghsa":[{"id":"GHSA-4mwf-4888-4x35","title":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows...","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C.\n\nThis issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.\n\n","status":"published","published":"2024-01-18T15:30:37Z","modified":"2024-06-27T12:31:48Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:57:32.114808Z"}],"nvd":[{"id":"CVE-2021-33630","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C.\n\nThis issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.","status":"published","published":"2024-01-18T15:15:08.653Z","modified":"2026-06-17T03:54:53.89Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:07:08.163458Z"}],"osv":[{"id":"CVE-2021-33630","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C.\n\nThis issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.","status":"published","published":"2024-01-18T15:15:08.653Z","modified":"2026-03-15T22:21:26.605667Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-33630","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C.  This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.","status":"published","published":"2024-01-18T15:15:08.653Z","modified":"2026-10-23T18:04:49.815361439Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"OESA-2024-1030","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nopeneuler-linux-kernel-4.19.0-cbs_destroy-NULL-ptr-deref-391216(CVE-2021-33630)\r\n\r\nopeneuler-linux-kernel-5.10.149-ext4_write_inline_data-kernel_bug-365020(CVE-2021-33631)\r\n\r\nAn out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).(CVE-2023-6121)\r\n\r\nA heap out-of-bounds write vulnerability in the Linux kernel\u0026apos;s Performance Events system component can be exploited to achieve local privilege escalation.\r\n\r\nA perf_event\u0026apos;s read_size can overflow, leading to an heap out-of-bounds increment or write in perf_read_group().\r\n\r\nWe recommend upgrading past commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b.\r\n\r\n(CVE-2023-6931)\r\n\r\nA use-after-free vulnerability in the Linux kernel\u0026apos;s ipv4: igmp component can be exploited to achieve local privilege escalation.\r\n\r\nA race condition can be exploited to cause a timer be mistakenly registered on a RCU read locked object which is freed by another thread.\r\n\r\nWe recommend upgrading past commit e2b706c691905fe78468c361aaabc719d0a496f1.\r\n\r\n(CVE-2023-6932)","status":"published","published":"2024-01-12T11:06:28Z","modified":"2026-08-18T01:18:12.245348891Z","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":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2024-1031","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nopeneuler-linux-kernel-4.19.0-cbs_destroy-NULL-ptr-deref-391216(CVE-2021-33630)\r\n\r\nopeneuler-linux-kernel-5.10.149-ext4_write_inline_data-kernel_bug-365020(CVE-2021-33631)\r\n\r\nAn issue was discovered in the Linux kernel through 6.3.8. A use-after-free was found in ravb_remove in drivers/net/ethernet/renesas/ravb_main.c.(CVE-2023-35827)\r\n\r\nAn out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).(CVE-2023-6121)\r\n\r\nA heap out-of-bounds write vulnerability in the Linux kernel\u0026apos;s Performance Events system component can be exploited to achieve local privilege escalation.\r\n\r\nA perf_event\u0026apos;s read_size can overflow, leading to an heap out-of-bounds increment or write in perf_read_group().\r\n\r\nWe recommend upgrading past commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b.\r\n\r\n(CVE-2023-6931)","status":"published","published":"2024-01-12T11:06:28Z","modified":"2026-08-18T01:18:12.608262133Z","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":"2026-11-02T15:52:40.71472Z"},{"id":"RHSA-2020:1567","title":"Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update","status":"published","published":"2024-09-13T22:39:49Z","modified":"2026-08-07T10:01:42Z","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":"2026-11-02T15:53:07.072948Z"},{"id":"RHSA-2020:1769","title":"Red Hat Security Advisory: kernel security, bug fix, and enhancement update","status":"published","published":"2024-09-13T22:39:41Z","modified":"2026-08-22T10:01:19Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"UBUNTU-CVE-2021-33630","description":"NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C. This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.","status":"published","published":"2024-01-18T15:15:00Z","modified":"2025-10-24T04:50:23Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:27.870979Z"},{"id":"DLA-3840-1","title":"linux - security update","status":"published","published":"2024-06-25T00:00:00Z","modified":"2026-03-09T01:22:46.815448Z","updated_at":"2026-11-02T15:46:12.203458Z"}]}}