{"id":"CVE-2021-3739","title":"A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’","summary":"A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-476","CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.20, < 5.4.144","linux_kernel >= 5.5, < 5.10.62","linux_kernel >= 5.11, < 5.13.14","linux_kernel >= 5.14, < 5.14.1","fedora = 34","h300s_firmware","h500s_firmware","h700s_firmware","h300e_firmware","h500e_firmware","h700e_firmware","h410s_firmware","h410c_firmware"],"patched":["linux_kernel 5.14.1"],"published":"2022-03-10","updated":"2026-09-01","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3739","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1997958","label":"secalert@redhat.com"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091","label":"secalert@redhat.com"},{"url":"https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091","label":"secalert@redhat.com"},{"url":"https://security.netapp.com/advisory/ntap-20220407-0006/","label":"secalert@redhat.com"},{"url":"https://ubuntu.com/security/CVE-2021-3739","label":"secalert@redhat.com"},{"url":"https://www.openwall.com/lists/oss-security/2021/08/25/3","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1997958","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220407-0006/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ubuntu.com/security/CVE-2021-3739","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2021/08/25/3","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00616,"epssPercentile":0.47829,"ingestedAt":"2026-09-01T18:30:36.501Z","slug":"CVE-2021-3739","body":"## Overview\n\nA NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.\n\n## Affected\n\n- `linux_kernel >= 4.20, < 5.4.144`\n- `linux_kernel >= 5.5, < 5.10.62`\n- `linux_kernel >= 5.11, < 5.13.14`\n- `linux_kernel >= 5.14, < 5.14.1`\n- `fedora = 34`\n- `h300s_firmware`\n- `h500s_firmware`\n- `h700s_firmware`\n- `h300e_firmware`\n- `h500e_firmware`\n- `h700e_firmware`\n- `h410s_firmware`\n- `h410c_firmware`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.14.1`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}