{"id":"DEBIAN-CVE-2023-53525","details":"In the Linux kernel, the following vulnerability has been resolved:  RDMA/cma: Allow UD qp_type to join multicast only  As for multicast: - The SIDR is the only mode that makes sense; - Besides PS_UDP, other port spaces like PS_IB is also allowed, as it is   UD compatible. In this case qkey also needs to be set [1].  This patch allows only UD qp_type to join multicast, and set qkey to default if it's not set, to fix an uninit-value error: the ib-\u003erec.qkey field is accessed without being initialized.  ===================================================== BUG: KMSAN: uninit-value in cma_set_qkey drivers/infiniband/core/cma.c:510 [inline] BUG: KMSAN: uninit-value in cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570  cma_set_qkey drivers/infiniband/core/cma.c:510 [inline]  cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570  cma_iboe_join_multicast drivers/infiniband/core/cma.c:4782 [inline]  rdma_join_multicast+0x2b83/0x30a0 drivers/infiniband/core/cma.c:4814  ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479  ucma_join_multicast+0x1e3/0x250 drivers/infiniband/core/ucma.c:1546  ucma_write+0x639/0x6d0 drivers/infiniband/core/ucma.c:1732  vfs_write+0x8ce/0x2030 fs/read_write.c:588  ksys_write+0x28c/0x520 fs/read_write.c:643  __do_sys_write fs/read_write.c:655 [inline]  __se_sys_write fs/read_write.c:652 [inline]  __ia32_sys_write+0xdb/0x120 fs/read_write.c:652  do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]  __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180  do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205  do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248  entry_SYSENTER_compat_after_hwframe+0x4d/0x5c  Local variable ib.i created at: cma_iboe_join_multicast drivers/infiniband/core/cma.c:4737 [inline] rdma_join_multicast+0x586/0x30a0 drivers/infiniband/core/cma.c:4814 ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479  CPU: 0 PID: 29874 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================  [1] https://lore.kernel.org/linux-rdma/20220117183832.GD84788@nvidia.com/","modified":"2026-09-15T09:02:51.808047427Z","published":"2025-10-01T12:15:57.037Z","upstream":["CVE-2023-53525"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53525"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53525.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53525.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53525.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:N/I:N/A:H"}]}