{"id":"DEBIAN-CVE-2025-39904","details":"In the Linux kernel, the following vulnerability has been resolved:  arm64: kexec: initialize kexec_buf struct in load_other_segments()  Patch series \"kexec: Fix invalid field access\".  The kexec_buf structure was previously declared without initialization.  commit bf454ec31add (\"kexec_file: allow to place kexec_buf randomly\") added a field that is always read but not consistently populated by all architectures.  This un-initialized field will contain garbage.  This is also triggering a UBSAN warning when the uninitialized data was accessed:  \t------------[ cut here ]------------ \tUBSAN: invalid-load in ./include/linux/kexec.h:210:10 \tload of value 252 is not a valid value for type '_Bool'  Zero-initializing kexec_buf at declaration ensures all fields are cleanly set, preventing future instances of uninitialized memory being used.  An initial fix was already landed for arm64[0], and this patchset fixes the problem on the remaining arm64 code and on riscv, as raised by Mark.  Discussions about this problem could be found at[1][2].   This patch (of 3):  The kexec_buf structure was previously declared without initialization. commit bf454ec31add (\"kexec_file: allow to place kexec_buf randomly\") added a field that is always read but not consistently populated by all architectures. This un-initialized field will contain garbage.  This is also triggering a UBSAN warning when the uninitialized data was accessed:  \t------------[ cut here ]------------ \tUBSAN: invalid-load in ./include/linux/kexec.h:210:10 \tload of value 252 is not a valid value for type '_Bool'  Zero-initializing kexec_buf at declaration ensures all fields are cleanly set, preventing future instances of uninitialized memory being used.","modified":"2026-09-01T20:05:50.722790587Z","published":"2025-10-01T08:15:33.250Z","upstream":["CVE-2025-39904"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-39904"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.16.8-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-39904.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"}]}