{"id":"CVE-2021-20263","aliases":["DEBIAN-CVE-2021-20263","EUVD-2021-7699","GHSA-349h-phx6-ghfj","SUSE-SU-2021:1942-1","openSUSE-SU-2021:1942-1","openSUSE-SU-2024:11287-1"],"status":"published","title":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new ...","description":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.","severity":{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00377,"percentile":0.31903,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-281"],"published":"2021-03-09T17:17:43Z","modified":"2026-10-23T18:02:41Z","fixes":[{"ecosystem":"Debian:12","package":"qemu","fixed_in":["1:5.2+dfsg-9"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"qemu","fixed_in":["1:5.2+dfsg-9"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"qemu","fixed_in":["1:5.2+dfsg-9"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.2+dfsg-9"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.2+dfsg-9"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.2+dfsg-9"}]}]},{"source":"osv","ecosystem":"SUSE:Linux 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Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20263"},{"url":"https://github.com/advisories/GHSA-349h-phx6-ghfj"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-20263","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211942-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1149813","tags":["report"]},{"url":"https://bugzilla.suse.com/1163019","tags":["report"]},{"url":"https://bugzilla.suse.com/1175144","tags":["report"]},{"url":"https://bugzilla.suse.com/1175534","tags":["report"]},{"url":"https://bugzilla.suse.com/1176681","tags":["report"]},{"url":"https://bugzilla.suse.com/1178683","tags":["report"]},{"url":"https://bugzilla.suse.com/1178935","tags":["report"]},{"url":"https://bugzilla.suse.com/1179477","tags":["report"]},{"url":"https://bugzilla.suse.com/1179484","tags":["report"]},{"url":"https://bugzilla.suse.com/1179686","tags":["report"]},{"url":"https://bugzilla.suse.com/1181103","tags":["report"]},{"url":"https://bugzilla.suse.com/1182282","tags":["report"]},{"url":"https://bugzilla.suse.com/1182425","tags":["report"]},{"url":"https://bugzilla.suse.com/1182968","tags":["report"]},{"url":"https://bugzilla.suse.com/1182975","tags":["report"]},{"url":"https://bugzilla.suse.com/1183373","tags":["report"]},{"url":"https://bugzilla.suse.com/1186290","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15890","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14364","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-17380","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25085","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25707","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25723","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27821","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29129","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29130","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8608","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20263","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3409","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3416","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3419","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/IEKBDJBTGKO53MSKM3SRYVUQDWIJ2N5I/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2014-0222","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-8106","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5225","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6855","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-8504","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-8619","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10028","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10155","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1714","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-6490","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-6836","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7156","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7157","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7161","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7170","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7421","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7422","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7423","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7466","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7907","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7908","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7909","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7994","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7995","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8576","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8577","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8578","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8667","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8668","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8669","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8909","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8910","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9101","tags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web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10717","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10761","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11102","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11869","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13361","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13362","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13659","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13800","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-16092","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-1711","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-1983","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-7039","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20181","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20203","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20221","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20257","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3527","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3544","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3545","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3546","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3582","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3607","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3608","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3682","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-20263","description":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. 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In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.","status":"published","published":"2021-03-09T17:17:43Z","modified":"2024-08-03T17:37:23Z","updated_at":"2026-11-03T03:25:09.355483Z"}],"ghsa":[{"id":"GHSA-349h-phx6-ghfj","title":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new ...","description":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. 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In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.","status":"published","published":"2021-03-09T18:15:15.593Z","modified":"2026-06-17T03:33:33.983Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-281"],"updated_at":"2026-11-02T14:06:50.399901Z"}],"osv":[{"id":"CVE-2021-20263","description":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.","status":"published","published":"2021-03-09T18:15:15.593Z","modified":"2026-03-15T22:38:47.337124Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"DEBIAN-CVE-2021-20263","description":"A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.","status":"published","published":"2021-03-09T18:15:15.593Z","modified":"2026-10-23T18:02:41.078984181Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"openSUSE-SU-2021:1942-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\n- Switch method of splitting off hw-s390x-virtio-gpu-ccw.so as a module to what was accepted upstream (bsc#1181103)\n- Fix OOB access in sdhci interface (CVE-2020-17380, bsc#1175144, CVE-2020-25085, bsc#1176681, CVE-2021-3409, bsc#1182282)\n- Fix potential privilege escalation in virtiofsd tool (CVE-2021-20263, bsc#1183373)\n- Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)\n- Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)\n- Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)\n- QEMU BIOS fails to read stage2 loader on s390x (bsc#1186290)\n- For the record, these issues are fixed in this package already.\n  Most are alternate references to previously mentioned issues:\n  (CVE-2019-15890, bsc#1149813, CVE-2020-8608, bsc#1163019,\n  CVE-2020-14364, bsc#1175534, CVE-2020-25707, bsc#1178683,\n  CVE-2020-25723, bsc#1178935, CVE-2020-29130, bsc#1179477,\n  CVE-2020-29129, bsc#1179484, CVE-2021-3419, bsc#1182975)\n","status":"published","published":"2021-07-11T09:13:24Z","modified":"2025-05-07T18:10:46.174369Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2024:11287-1","title":"qemu-6.1.0-32.1 on GA media","description":"These are all security issues fixed in the qemu-6.1.0-32.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2025-05-07T18:08:57.481645Z","updated_at":"2026-11-02T16:58:34.894275Z"},{"id":"SUSE-SU-2021:1942-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\n- Switch method of splitting off hw-s390x-virtio-gpu-ccw.so as a module to what was accepted upstream (bsc#1181103)\n- Fix OOB access in sdhci interface (CVE-2020-17380, bsc#1175144, CVE-2020-25085, bsc#1176681, CVE-2021-3409, bsc#1182282)\n- Fix potential privilege escalation in virtiofsd tool (CVE-2021-20263, bsc#1183373)\n- Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)\n- Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)\n- Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)\n- QEMU BIOS fails to read stage2 loader on s390x (bsc#1186290)\n- For the record, these issues are fixed in this package already.\n  Most are alternate references to previously mentioned issues:\n  (CVE-2019-15890, bsc#1149813, CVE-2020-8608, bsc#1163019,\n  CVE-2020-14364, bsc#1175534, CVE-2020-25707, bsc#1178683,\n  CVE-2020-25723, bsc#1178935, CVE-2020-29130, bsc#1179477,\n  CVE-2020-29129, bsc#1179484, CVE-2021-3419, bsc#1182975)\n","status":"published","published":"2021-06-10T08:50:33Z","modified":"2026-02-04T02:14:19.470204Z","updated_at":"2026-11-02T15:53:49.138643Z"}]}}