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{"bugzilla": {"description": "kernel: out-of-bounds write in __btrfs_map_block in fs/btrfs/volumes.c", "id": "1784923", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1784923"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image and performing some operations can cause slab-out-of-bounds write access in __btrfs_map_block in fs/btrfs/volumes.c, because a value of 1 for the number of data stripes is mishandled.", "A flaw was found in the implementation of the BTRFS file system code in the Linux kernel. An attacker, who is able to mount a crafted BTRFS filesystem and perform common filesystem operations, can possibly cause an out-of-bounds write to memory. This could lead to memory corruption or privilege escalation."], "mitigation": {"lang": "en:us", "value": "As the BTRFS module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:\n# echo \"install btrfs /bin/true\" >> /etc/modprobe.d/disable-btrfs.conf\nThe system will need to be restarted if the BTRFS modules are loaded, it may be possible to unload them. In most circumstances, the BTRFS kernel modules will be unable to be unloaded while any BTRFS filesystems are mounted or in use.\nIf the system requires this module to work correctly, this mitigation may not be suitable.\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services."}, "name": "CVE-2019-19816", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2019-12-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-19816\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-19816"], "statement": "The vulnerability is considered moderate rather than important because it requires specific conditions to be exploited. An attacker must have physical access to the system and be able to mount a crafted BTRFS filesystem, which limits the potential attack vectors and also a local account to abuse the use-after-free. Additionally, the flaw involves an out-of-bounds write when handling RAID56 metadata, which could lead to memory corruption, but exploitation for privilege escalation is not straightforward due to mitigations like kernel address space layout randomization (KASLR). As a result, the impact is more constrained, affecting system stability rather than directly allowing unauthorized access or significant data compromise.", "threat_severity": "Moderate"}