{"id":"DEBIAN-CVE-2026-98515","details":"In the Linux kernel, the following vulnerability has been resolved:  drm/nouveau: fix double-free in nvif_vmm_dtor  On failure, nouveau_cli_init() calls nouveau_cli_fini() to tear the client down. Then, nouveau_drm_open() also enters into its cleanup path and calls nouveau_cli_fini() AGAIN. nouveau_cli_fini() calls nouveau_vmm_fini():  \tvoid \tnouveau_vmm_fini(struct nouveau_vmm *vmm) \t{ \t\tnouveau_svmm_fini(&vmm-\u003esvmm); \t\tnvif_vmm_dtor(&vmm-\u003evmm); \t\tvmm-\u003ecli = NULL; \t}  Inside nvif_vmm_dtor(), vmm-\u003epage is freed unconditionally:  \tvoid \tnvif_vmm_dtor(struct nvif_vmm *vmm) \t{ \t\tkfree(vmm-\u003epage); \t\tnvif_object_dtor(&vmm-\u003eobject); \t}  vmm-\u003epage is never cleared after being freed, so the second call of nvif_vmm_dtor() will cause a double-free.  Found by fuzzing the nouveau driver with a modified Syzkaller:  \tBUG: KASAN: double-free in nvif_vmm_dtor+0x31/0x50 drivers/gpu/drm/nouveau/nvif/vmm.c:194 \tFree of addr ffff888010fcdc30 by task syz.0.173/2567  \tCPU: 1 UID: 0 PID: 2567 Comm: syz.0.173 Not tainted 7.2.0 #24 PREEMPT(lazy) \tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 \tCall Trace: \t\u003cTASK\u003e \t__dump_stack lib/dump_stack.c:94 [inline] \tdump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120 \tprint_address_description mm/kasan/report.c:378 [inline] \tprint_report+0xcb/0x5a0 mm/kasan/report.c:482 \tkasan_report_invalid_free+0xaa/0xd0 mm/kasan/report.c:557 \tcheck_slab_allocation+0xe4/0x110 mm/kasan/common.c:235 \tkasan_slab_pre_free include/linux/kasan.h:199 [inline] \tslab_free_hook mm/slub.c:2622 [inline] \tslab_free mm/slub.c:6377 [inline] \tkfree+0x192/0x590 mm/slub.c:6692 \tnvif_vmm_dtor+0x31/0x50 drivers/gpu/drm/nouveau/nvif/vmm.c:194 \tnouveau_vmm_fini+0x16/0x50 drivers/gpu/drm/nouveau/nouveau_vmm.c:127 \tnouveau_cli_fini+0x10e/0x210 drivers/gpu/drm/nouveau/nouveau_drm.c:225 \tnouveau_drm_open+0x24e/0x740 drivers/gpu/drm/nouveau/nouveau_drm.c:1255 \tdrm_file_alloc+0x5f2/0xad0 drivers/gpu/drm/drm_file.c:176 \tdrm_open_helper+0x1d7/0x4a0 drivers/gpu/drm/drm_file.c:335 \tdrm_open+0x190/0x3d0 drivers/gpu/drm/drm_file.c:388 \tdrm_stub_open+0x1f2/0x460 drivers/gpu/drm/drm_drv.c:1211 \tchrdev_open+0x21c/0x660 fs/char_dev.c:411 \tdo_dentry_open+0x59d/0x12b0 fs/open.c:947 \tvfs_open+0x82/0x390 fs/open.c:1052 \tdo_open fs/namei.c:4700 [inline] \tpath_openat+0x2345/0x3420 fs/namei.c:4863 \tdo_file_open+0x207/0x460 fs/namei.c:4892 \tdo_sys_openat2+0xd1/0x1d0 fs/open.c:1368 \tdo_sys_open fs/open.c:1374 [inline] \t__do_sys_openat fs/open.c:1390 [inline] \t__se_sys_openat fs/open.c:1385 [inline] \t__x64_sys_openat+0x144/0x200 fs/open.c:1385 \tdo_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] \tdo_syscall_64+0x115/0x690 arch/x86/entry/syscall_64.c:94 \tentry_SYSCALL_64_after_hwframe+0x77/0x7f \tRIP: 0033:0x7fc6d687594d \tCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 \tRSP: 002b:00007fc6d5295008 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 \tRAX: ffffffffffffffda RBX: 00007fc6d6b06180 RCX: 00007fc6d687594d \tRDX: 0000000000022501 RSI: 0000200000000000 RDI: ffffffffffffff9c \tRBP: 00007fc6d691c303 R08: 0000000000000000 R09: 0000000000000000 \tR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 \tR13: 00007fc6d6b06218 R14: 00007fc6d6b06180 R15: 00007ffd9451d760 \t\u003c/TASK\u003e  \tAllocated by task 2567 on cpu 1 at 163.593900s: \tkasan_save_stack+0x24/0x50 mm/kasan/common.c:57 \tkasan_save_track+0x17/0x60 mm/kasan/common.c:78 \tpoison_kmalloc_redzone mm/kasan/common.c:398 [inline] \t__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 \tkasan_kmalloc include/linux/kasan.h:263 [inline] \t__do_kmalloc_node mm/slub.c:5334 [inline] \t__kmalloc_noprof+0x304/0x7c0 mm/slub.c:5359 \t_kmalloc_noprof include/linux/slab.h:992 [inline] \tnvif_vmm_ctor+0x3c0/0x7e0 drivers/gpu/drm/nouveau/nvif/vmm.c:237 \tnouveau_vmm_init+0x40/0x90 drivers/gpu/drm/nouveau/nouveau_vmm.c:134 \tnouveau_cli_init+0x7b9/0 ---truncated---","modified":"2026-10-19T05:00:09.523295449Z","published":"2026-10-18T17:47:31.187286903Z","upstream":["CVE-2026-98515"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-98515"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.190-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.187-1","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","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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