{"id":"DEBIAN-CVE-2026-23199","details":"In the Linux kernel, the following vulnerability has been resolved:  procfs: avoid fetching build ID while holding VMA lock  Fix PROCMAP_QUERY to fetch optional build ID only after dropping mmap_lock or per-VMA lock, whichever was used to lock VMA under question, to avoid deadlock reported by syzbot:   -\u003e #1 (&mm-\u003emmap_lock){++++}-{4:4}:         __might_fault+0xed/0x170         _copy_to_iter+0x118/0x1720         copy_page_to_iter+0x12d/0x1e0         filemap_read+0x720/0x10a0         blkdev_read_iter+0x2b5/0x4e0         vfs_read+0x7f4/0xae0         ksys_read+0x12a/0x250         do_syscall_64+0xcb/0xf80         entry_SYSCALL_64_after_hwframe+0x77/0x7f   -\u003e #0 (&sb-\u003es_type-\u003ei_mutex_key#8){++++}-{4:4}:         __lock_acquire+0x1509/0x26d0         lock_acquire+0x185/0x340         down_read+0x98/0x490         blkdev_read_iter+0x2a7/0x4e0         __kernel_read+0x39a/0xa90         freader_fetch+0x1d5/0xa80         __build_id_parse.isra.0+0xea/0x6a0         do_procmap_query+0xd75/0x1050         procfs_procmap_ioctl+0x7a/0xb0         __x64_sys_ioctl+0x18e/0x210         do_syscall_64+0xcb/0xf80         entry_SYSCALL_64_after_hwframe+0x77/0x7f   other info that might help us debug this:    Possible unsafe locking scenario:          CPU0                    CPU1         ----                    ----    rlock(&mm-\u003emmap_lock);                                 lock(&sb-\u003es_type-\u003ei_mutex_key#8);                                 lock(&mm-\u003emmap_lock);    rlock(&sb-\u003es_type-\u003ei_mutex_key#8);    *** DEADLOCK ***  This seems to be exacerbated (as we haven't seen these syzbot reports before that) by the recent:  \t777a8560fd29 (\"lib/buildid: use __kernel_read() for sleepable context\")  To make this safe, we need to grab file refcount while VMA is still locked, but other than that everything is pretty straightforward. Internal build_id_parse() API assumes VMA is passed, but it only needs the underlying file reference, so just add another variant build_id_parse_file() that expects file passed directly.  [akpm@linux-foundation.org: fix up kerneldoc]","modified":"2026-08-27T23:05:47.235120385Z","published":"2026-02-14T17:15:57.743Z","upstream":["CVE-2026-23199"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23199"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.73-1"}]}],"versions":["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~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23199.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.10-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","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","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23199.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"}]}