{"id":"DEBIAN-CVE-2026-31654","details":"In the Linux kernel, the following vulnerability has been resolved:  mm/vma: fix memory leak in __mmap_region()  commit 605f6586ecf7 (\"mm/vma: do not leak memory when .mmap_prepare swaps the file\") handled the success path by skipping get_file() via file_doesnt_need_get, but missed the error path.  When /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls shmem_zero_setup_desc() which allocates a new shmem file to back the mapping. If __mmap_new_vma() subsequently fails, this replacement file is never fput()'d - the original is released by ksys_mmap_pgoff(), but nobody releases the new one.  Add fput() for the swapped file in the error path.  Reproducible with fault injection.  FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace:  \u003cTASK\u003e  dump_stack_lvl+0x164/0x1f0  should_fail_ex+0x525/0x650  should_failslab+0xdf/0x140  kmem_cache_alloc_noprof+0x78/0x630  vm_area_alloc+0x24/0x160  __mmap_region+0xf6b/0x2660  mmap_region+0x2eb/0x3a0  do_mmap+0xc79/0x1240  vm_mmap_pgoff+0x252/0x4c0  ksys_mmap_pgoff+0xf8/0x120  __x64_sys_mmap+0x12a/0x190  do_syscall_64+0xa9/0x580  entry_SYSCALL_64_after_hwframe+0x76/0x7e  \u003c/TASK\u003e  kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) BUG: memory leak unreferenced object 0xffff8881118aca80 (size 360):   comm \"syz.7.14\", pid 366, jiffies 4294913255   hex dump (first 32 bytes):     00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........     ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....   backtrace (crc db0f53bc):     kmem_cache_alloc_noprof+0x3ab/0x630     alloc_empty_file+0x5a/0x1e0     alloc_file_pseudo+0x135/0x220     __shmem_file_setup+0x274/0x420     shmem_zero_setup_desc+0x9c/0x170     mmap_zero_prepare+0x123/0x140     __mmap_region+0xdda/0x2660     mmap_region+0x2eb/0x3a0     do_mmap+0xc79/0x1240     vm_mmap_pgoff+0x252/0x4c0     ksys_mmap_pgoff+0xf8/0x120     __x64_sys_mmap+0x12a/0x190     do_syscall_64+0xa9/0x580     entry_SYSCALL_64_after_hwframe+0x76/0x7e  Found by syzkaller.","modified":"2026-10-01T03:02:35.864452339Z","published":"2026-04-24T15:16:44.890Z","upstream":["CVE-2026-31654"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-31654"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.13-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.111-1","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","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","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","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31654.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"}]}