{"id":"DEBIAN-CVE-2025-40225","details":"In the Linux kernel, the following vulnerability has been resolved:  drm/panthor: Fix kernel panic on partial unmap of a GPU VA region  This commit address a kernel panic issue that can happen if Userspace tries to partially unmap a GPU virtual region (aka drm_gpuva). The VM_BIND interface allows partial unmapping of a BO.  Panthor driver pre-allocates memory for the new drm_gpuva structures that would be needed for the map/unmap operation, done using drm_gpuvm layer. It expected that only one new drm_gpuva would be needed on umap but a partial unmap can require 2 new drm_gpuva and that's why it ended up doing a NULL pointer dereference causing a kernel panic.  Following dump was seen when partial unmap was exercised.  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000078  Mem abort info:    ESR = 0x0000000096000046    EC = 0x25: DABT (current EL), IL = 32 bits    SET = 0, FnV = 0    EA = 0, S1PTW = 0    FSC = 0x06: level 2 translation fault  Data abort info:    ISV = 0, ISS = 0x00000046, ISS2 = 0x00000000    CM = 0, WnR = 1, TnD = 0, TagAccess = 0    GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0  user pgtable: 4k pages, 48-bit VAs, pgdp=000000088a863000  [000000000000078] pgd=080000088a842003, p4d=080000088a842003, pud=0800000884bf5003, pmd=0000000000000000  Internal error: Oops: 0000000096000046 [#1] PREEMPT SMP  \u003csnip\u003e  pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : panthor_gpuva_sm_step_remap+0xe4/0x330 [panthor]  lr : panthor_gpuva_sm_step_remap+0x6c/0x330 [panthor]  sp : ffff800085d43970  x29: ffff800085d43970 x28: ffff00080363e440 x27: ffff0008090c6000  x26: 0000000000000030 x25: ffff800085d439f8 x24: ffff00080d402000  x23: ffff800085d43b60 x22: ffff800085d439e0 x21: ffff00080abdb180  x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000010  x17: 6e656c202c303030 x16: 3666666666646466 x15: 393d61766f69202c  x14: 312d3d7361203a70 x13: 303030323d6e656c x12: ffff80008324bf58  x11: 0000000000000003 x10: 0000000000000002 x9 : ffff8000801a6a9c  x8 : ffff00080360b300 x7 : 0000000000000000 x6 : 000000088aa35fc7  x5 : fff1000080000000 x4 : ffff8000842ddd30 x3 : 0000000000000001  x2 : 0000000100000000 x1 : 0000000000000001 x0 : 0000000000000078  Call trace:   panthor_gpuva_sm_step_remap+0xe4/0x330 [panthor]   op_remap_cb.isra.22+0x50/0x80   __drm_gpuvm_sm_unmap+0x10c/0x1c8   drm_gpuvm_sm_unmap+0x40/0x60   panthor_vm_exec_op+0xb4/0x3d0 [panthor]   panthor_vm_bind_exec_sync_op+0x154/0x278 [panthor]   panthor_ioctl_vm_bind+0x160/0x4a0 [panthor]   drm_ioctl_kernel+0xbc/0x138   drm_ioctl+0x240/0x500   __arm64_sys_ioctl+0xb0/0xf8   invoke_syscall+0x4c/0x110   el0_svc_common.constprop.1+0x98/0xf8   do_el0_svc+0x24/0x38   el0_svc+0x40/0xf8   el0t_64_sync_handler+0xa0/0xc8   el0t_64_sync+0x174/0x178","modified":"2026-08-27T22:48:38.520887086Z","published":"2025-12-04T16:16:15.043Z","upstream":["CVE-2025-40225"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40225"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.57-1"}]}],"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~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40225.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.6-1"}]}],"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","6.17.2-1~exp1","6.17.5-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40225.json"}}],"schema_version":"1.9.0"}