{"id":"DEBIAN-CVE-2021-47261","details":"In the Linux kernel, the following vulnerability has been resolved:  IB/mlx5: Fix initializing CQ fragments buffer  The function init_cq_frag_buf() can be called to initialize the current CQ fragments buffer cq-\u003ebuf, or the temporary cq-\u003eresize_buf that is filled during CQ resize operation.  However, the offending commit started to use function get_cqe() for getting the CQEs, the issue with this change is that get_cqe() always returns CQEs from cq-\u003ebuf, which leads us to initialize the wrong buffer, and in case of enlarging the CQ we try to access elements beyond the size of the current cq-\u003ebuf and eventually hit a kernel panic.   [exception RIP: init_cq_frag_buf+103]   [ffff9f799ddcbcd8] mlx5_ib_resize_cq at ffffffffc0835d60 [mlx5_ib]   [ffff9f799ddcbdb0] ib_resize_cq at ffffffffc05270df [ib_core]   [ffff9f799ddcbdc0] llt_rdma_setup_qp at ffffffffc0a6a712 [llt]   [ffff9f799ddcbe10] llt_rdma_cc_event_action at ffffffffc0a6b411 [llt]   [ffff9f799ddcbe98] llt_rdma_client_conn_thread at ffffffffc0a6bb75 [llt]   [ffff9f799ddcbec8] kthread at ffffffffa66c5da1   [ffff9f799ddcbf50] ret_from_fork_nospec_begin at ffffffffa6d95ddd  Fix it by getting the needed CQE by calling mlx5_frag_buf_get_wqe() that takes the correct source buffer as a parameter.","modified":"2026-09-15T09:02:31.275124965Z","published":"2024-05-21T15:15:14.770Z","upstream":["CVE-2021-47261"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47261"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47261.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47261.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.46-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47261.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}