{"id":"CVE-2021-38203","aliases":["AZL-6587","DEBIAN-CVE-2021-38203","EUVD-2021-24661","GHSA-5fjr-c5p8-hxvj","UBUNTU-CVE-2021-38203","USN-5096-1"],"status":"published","title":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock)...","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00365,"percentile":0.30688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-667","CWE-770"],"published":"2021-08-08T19:25:31Z","modified":"2026-10-23T18:03:31Z","fixes":[{"ecosystem":"Azure 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List","Patch","Vendor Advisory","fix","report"]},{"url":"https://github.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","fix","report"]},{"url":"https://security.netapp.com/advisory/ntap-20210902-0010/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38203","tags":["web"]},{"url":"https://github.com/advisories/GHSA-5fjr-c5p8-hxvj"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-38203","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-38203","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5096-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38203","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3612","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3679","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3732","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-34556","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-35477","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-37159","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38160","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38166","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38199","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38201","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38202","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38204","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38205","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-40490","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-41073","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-38203","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T19:25:31Z","modified":"2024-08-04T01:37:16.305Z","updated_at":"2026-11-02T14:33:07.349244Z"}],"euvd":[{"id":"EUVD-2021-24661","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T19:25:31Z","modified":"2024-08-04T01:37:16Z","updated_at":"2026-11-03T03:24:25.244479Z"}],"ghsa":[{"id":"GHSA-5fjr-c5p8-hxvj","title":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock)...","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2022-05-24T19:10:23Z","modified":"2023-01-30T05:01:18Z","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-667","CWE-770"],"updated_at":"2026-11-02T14:46:22.963176Z"}],"nvd":[{"id":"CVE-2021-38203","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T20:15:07.217Z","modified":"2026-06-17T04:01:45.283Z","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":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:06:56.562207Z"}],"osv":[{"id":"AZL-6587","title":"CVE-2021-38203 affecting package kernel for versions less than 5.10.78.1-1","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T20:15:07Z","modified":"2026-04-21T04:37:42.939623Z","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":"2026-11-02T15:28:08.354547Z"},{"id":"CVE-2021-38203","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T20:15:07.217Z","modified":"2026-04-11T21:23:11.403332Z","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":"2026-11-02T15:44:20.843843Z"},{"id":"DEBIAN-CVE-2021-38203","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T20:15:07.217Z","modified":"2026-10-23T18:03:31.364467535Z","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":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-38203","description":"btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.","status":"published","published":"2021-08-08T20:15:00Z","modified":"2026-02-04T03:32:04.720274Z","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":"2026-11-02T15:54:28.526929Z"},{"id":"USN-5096-1","title":"linux-oem-5.13 vulnerabilities","description":"Valentina Palmiotti discovered that the io_uring subsystem in the Linux\nkernel could be coerced to free adjacent memory. A local attacker could use\nthis to execute arbitrary code. (CVE-2021-41073)\n\nBenedict Schlueter discovered that the BPF subsystem in the Linux kernel\ndid not properly protect against Speculative Store Bypass (SSB) side-\nchannel attacks in some situations. A local attacker could possibly use\nthis to expose sensitive information. (CVE-2021-34556)\n\nPiotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not\nproperly protect against Speculative Store Bypass (SSB) side-channel\nattacks in some situations. A local attacker could possibly use this to\nexpose sensitive information. (CVE-2021-35477)\n\nMurray McAllister discovered that the joystick device interface in the\nLinux kernel did not properly validate data passed via an ioctl(). A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code on systems with a joystick device\nregistered. (CVE-2021-3612)\n\nIt was discovered that the tracing subsystem in the Linux kernel did not\nproperly keep track of per-cpu ring buffer state. A privileged attacker\ncould use this to cause a denial of service. (CVE-2021-3679)\n\nIt was discovered that the Option USB High Speed Mobile device driver in\nthe Linux kernel did not properly handle error conditions. A physically\nproximate attacker could use this to cause a denial of service (system\ncrash) or possibly execute arbitrary code. (CVE-2021-37159)\n\nAlois Wohlschlager discovered that the overlay file system in the Linux\nkernel did not restrict private clones in some situations. An attacker\ncould use this to expose sensitive information. (CVE-2021-3732)\n\nIt was discovered that the Virtio console implementation in the Linux\nkernel did not properly validate input lengths in some situations. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-38160)\n\nIt was discovered that the BPF subsystem in the Linux kernel contained an\ninteger overflow in its hash table implementation. A local attacker could\nuse this to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-38166)\n\nMichael Wakabayashi discovered that the NFSv4 client implementation in the\nLinux kernel did not properly order connection setup operations. An\nattacker controlling a remote NFS server could use this to cause a denial\nof service on the client. (CVE-2021-38199)\n\nIt was discovered that the Sun RPC implementation in the Linux kernel\ncontained an out-of-bounds access error. A remote attacker could possibly\nuse this to cause a denial of service (system crash). (CVE-2021-38201)\n\nIt was discovered that the NFS server implementation in the Linux kernel\ncontained an out-of-bounds read when the trace even framework is being used\nfor nfsd. A remote attacker could possibly use this to cause a denial of\nservice (system crash). (CVE-2021-38202)\n\nNaohiro Aota discovered that the btrfs file system in the Linux kernel\ncontained a race condition in situations that triggered allocations of new\nsystem chunks. A local attacker could possibly use this to cause a denial\nof service (deadlock). (CVE-2021-38203)\n\nIt was discovered that the MAX-3421 host USB device driver in the Linux\nkernel did not properly handle device removal events. A physically\nproximate attacker could use this to cause a denial of service (system\ncrash). (CVE-2021-38204)\n\nIt was discovered that the Xilinx 10/100 Ethernet Lite device driver in the\nLinux kernel could report pointer addresses in some situations. An attacker\ncould use this information to ease the exploitation of another\nvulnerability. (CVE-2021-38205)\n\nIt was discovered that the ext4 file system in the Linux kernel contained a\nrace condition when writing xattrs to an inode. A local attacker could use\nthis to cause a denial of service or possibly gain administrative\nprivileges. (CVE-2021-40490)\n","status":"published","published":"2021-09-29T22:27:08Z","modified":"2026-09-09T14:32:44.012948981Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}