{"id":"DEBIAN-CVE-2023-54069","details":"In the Linux kernel, the following vulnerability has been resolved:  ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow  When we calculate the end position of ext4_free_extent, this position may be exactly where ext4_lblk_t (i.e. uint) overflows. For example, if ac_g_ex.fe_logical is 4294965248 and ac_orig_goal_len is 2048, then the computed end is 0x100000000, which is 0. If ac-\u003eac_o_ex.fe_logical is not the first case of adjusting the best extent, that is, new_bex_end \u003e 0, the following BUG_ON will be triggered:  ========================================================= kernel BUG at fs/ext4/mballoc.c:5116! invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 673 Comm: xfs_io Tainted: G E 6.5.0-rc1+ #279 RIP: 0010:ext4_mb_new_inode_pa+0xc5/0x430 Call Trace:  \u003cTASK\u003e  ext4_mb_use_best_found+0x203/0x2f0  ext4_mb_try_best_found+0x163/0x240  ext4_mb_regular_allocator+0x158/0x1550  ext4_mb_new_blocks+0x86a/0xe10  ext4_ext_map_blocks+0xb0c/0x13a0  ext4_map_blocks+0x2cd/0x8f0  ext4_iomap_begin+0x27b/0x400  iomap_iter+0x222/0x3d0  __iomap_dio_rw+0x243/0xcb0  iomap_dio_rw+0x16/0x80 =========================================================  A simple reproducer demonstrating the problem:  \tmkfs.ext4 -F /dev/sda -b 4096 100M \tmount /dev/sda /tmp/test \tfallocate -l1M /tmp/test/tmp \tfallocate -l10M /tmp/test/file \tfallocate -i -o 1M -l16777203M /tmp/test/file \tfsstress -d /tmp/test -l 0 -n 100000 -p 8 & \tsleep 10 && killall -9 fsstress \trm -f /tmp/test/tmp \txfs_io -c \"open -ad /tmp/test/file\" -c \"pwrite -S 0xff 0 8192\"  We simply refactor the logic for adjusting the best extent by adding a temporary ext4_free_extent ex and use extent_logical_end() to avoid overflow, which also simplifies the code.","modified":"2026-09-15T08:47:46.506441278Z","published":"2025-12-24T13:16:08.747Z","upstream":["CVE-2023-54069"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-54069"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.64-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54069.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54069.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54069.json"}}],"schema_version":"1.9.0"}