218 lines
14 KiB
JSON
218 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38449",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:24.018Z",
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"datePublished": "2025-07-25T15:27:30.702Z",
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"dateUpdated": "2026-10-15T21:52:16.382Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:01:59.291Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gem: Acquire references on GEM handles for framebuffers\n\nA GEM handle can be released while the GEM buffer object is attached\nto a DRM framebuffer. This leads to the release of the dma-buf backing\nthe buffer object, if any. [1] Trying to use the framebuffer in further\nmode-setting operations leads to a segmentation fault. Most easily\nhappens with driver that use shadow planes for vmap-ing the dma-buf\nduring a page flip. An example is shown below.\n\n[ 156.791968] ------------[ cut here ]------------\n[ 156.796830] WARNING: CPU: 2 PID: 2255 at drivers/dma-buf/dma-buf.c:1527 dma_buf_vmap+0x224/0x430\n[...]\n[ 156.942028] RIP: 0010:dma_buf_vmap+0x224/0x430\n[ 157.043420] Call Trace:\n[ 157.045898] <TASK>\n[ 157.048030] ? show_trace_log_lvl+0x1af/0x2c0\n[ 157.052436] ? show_trace_log_lvl+0x1af/0x2c0\n[ 157.056836] ? show_trace_log_lvl+0x1af/0x2c0\n[ 157.061253] ? drm_gem_shmem_vmap+0x74/0x710\n[ 157.065567] ? dma_buf_vmap+0x224/0x430\n[ 157.069446] ? __warn.cold+0x58/0xe4\n[ 157.073061] ? dma_buf_vmap+0x224/0x430\n[ 157.077111] ? report_bug+0x1dd/0x390\n[ 157.080842] ? handle_bug+0x5e/0xa0\n[ 157.084389] ? exc_invalid_op+0x14/0x50\n[ 157.088291] ? asm_exc_invalid_op+0x16/0x20\n[ 157.092548] ? dma_buf_vmap+0x224/0x430\n[ 157.096663] ? dma_resv_get_singleton+0x6d/0x230\n[ 157.101341] ? __pfx_dma_buf_vmap+0x10/0x10\n[ 157.105588] ? __pfx_dma_resv_get_singleton+0x10/0x10\n[ 157.110697] drm_gem_shmem_vmap+0x74/0x710\n[ 157.114866] drm_gem_vmap+0xa9/0x1b0\n[ 157.118763] drm_gem_vmap_unlocked+0x46/0xa0\n[ 157.123086] drm_gem_fb_vmap+0xab/0x300\n[ 157.126979] drm_atomic_helper_prepare_planes.part.0+0x487/0xb10\n[ 157.133032] ? lockdep_init_map_type+0x19d/0x880\n[ 157.137701] drm_atomic_helper_commit+0x13d/0x2e0\n[ 157.142671] ? drm_atomic_nonblocking_commit+0xa0/0x180\n[ 157.147988] drm_mode_atomic_ioctl+0x766/0xe40\n[...]\n[ 157.346424] ---[ end trace 0000000000000000 ]---\n\nAcquiring GEM handles for the framebuffer's GEM buffer objects prevents\nthis from happening. The framebuffer's cleanup later puts the handle\nreferences.\n\nCommit 1a148af06000 (\"drm/gem-shmem: Use dma_buf from GEM object\ninstance\") triggers the segmentation fault easily by using the dma-buf\nfield more widely. The underlying issue with reference counting has\nbeen present before.\n\nv2:\n- acquire the handle instead of the BO (Christian)\n- fix comment style (Christian)\n- drop the Fixes tag (Christian)\n- rename err_ gotos\n- add missing Link tag"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is triggered purely through DRM ioctls (PRIME_FD_TO_HANDLE, ADDFB2, GEM_CLOSE, MODE_ATOMIC/PAGE_FLIP) on a local device node /dev/dri/card*. There is no network or remote-peer data path into drm_gem_fb_init_with_funcs() or drm_gem_object_handle_put_unlocked().\nAC:L - The attacker performs the entire sequence themselves — import a dma-buf, create a framebuffer, close the GEM handle, then commit the framebuffer — and the resulting release of the still-referenced dma-buf is deterministic, with no race or memory-layout condition outside the attacker's control. Where a window is involved (begin_fb_access in prepare_planes vs. end_fb_access in cleanup_planes), the attacker drives both sides from their own threads.\nPR:L - Only an unprivileged local account with access to a DRM primary node is needed (video group, active-seat ACL, Android graphics group); ADDFB2/RMFB/GEM_CLOSE require no master or auth flags at all. DRM master, needed for the atomic commit, is handed out by drm_master_open() to the first opener of the node with no capability check, and is also available via DRM leases — no real root is required.\nUI:N - A single attacker-controlled process performs every step — buffer import, framebuffer creation, handle close, and the mode-setting commit. No victim action or cooperating process is involved.\nS:U - The premature release and subsequent misuse of the GEM object's dma-buf occur entirely within the kernel's own security authority on the same host. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a reference-counting/lifetime defect that releases the dma-buf backing a framebuffer that remains live and in active use by plane state, the scanout engine and shadow-plane kernel mappings — a use-after-free-class flaw. Such premature release of a GEM/dma-buf backing store, with attacker-controlled heap grooming via DUMB_CREATE and repeated import/close cycles, is leverageable into disclosure of reallocated kernel memory contents.\nI:H - The same missing handle reference lets the kernel continue writing through stale framebuffer state (shadow-plane blits, damage handling) into storage whose backing reference has been dropped, and the unguarded dma_buf_end_cpu_access() path performs an indirect call through dmabuf->ops on a released/invalid dma_buf. This gives a memory-corruption and control-flow primitive rather than a benign failure.\nA:H - The documented result is a WARNING splat in dma_buf_vmap() (a panic on the widely deployed panic_on_warn configurations) and a kernel oops — dma_buf_end_cpu_access() only does WARN_ON(!dmabuf) without returning and then dereferences dmabuf->resv and dmabuf->ops. Any local user with DRM access can trigger this repeatedly to crash the machine."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/drm_gem.c",
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"drivers/gpu/drm/drm_gem_framebuffer_helper.c",
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"drivers/gpu/drm/drm_internal.h"
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],
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"drivers/gpu/drm/drm_gem_framebuffer_helper.c",
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},
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"status": "unaffected",
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},
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"lessThanOrEqual": "6.15.*",
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"status": "unaffected",
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"id": "CVE-2025-38449",
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