CVE-2024-35932 (GCVE-0-2024-35932)

Vulnerability from cvelistv5 – Published: 2024-05-19 10:10 – Updated: 2026-01-05 10:35
VLAI?
Title
drm/vc4: don't check if plane->state->fb == state->fb
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: don't check if plane->state->fb == state->fb Currently, when using non-blocking commits, we can see the following kernel warning: [ 110.908514] ------------[ cut here ]------------ [ 110.908529] refcount_t: underflow; use-after-free. [ 110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0 [ 110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6 [ 110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G C 6.1.66-v8+ #32 [ 110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) [ 110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 110.909132] pc : refcount_dec_not_one+0xb8/0xc0 [ 110.909152] lr : refcount_dec_not_one+0xb4/0xc0 [ 110.909170] sp : ffffffc00913b9c0 [ 110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60 [ 110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480 [ 110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78 [ 110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000 [ 110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004 [ 110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003 [ 110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00 [ 110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572 [ 110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000 [ 110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001 [ 110.909434] Call trace: [ 110.909441] refcount_dec_not_one+0xb8/0xc0 [ 110.909461] vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4] [ 110.909903] vc4_cleanup_fb+0x44/0x50 [vc4] [ 110.910315] drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper] [ 110.910669] vc4_atomic_commit_tail+0x390/0x9dc [vc4] [ 110.911079] commit_tail+0xb0/0x164 [drm_kms_helper] [ 110.911397] drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper] [ 110.911716] drm_atomic_commit+0xb0/0xdc [drm] [ 110.912569] drm_mode_atomic_ioctl+0x348/0x4b8 [drm] [ 110.913330] drm_ioctl_kernel+0xec/0x15c [drm] [ 110.914091] drm_ioctl+0x24c/0x3b0 [drm] [ 110.914850] __arm64_sys_ioctl+0x9c/0xd4 [ 110.914873] invoke_syscall+0x4c/0x114 [ 110.914897] el0_svc_common+0xd0/0x118 [ 110.914917] do_el0_svc+0x38/0xd0 [ 110.914936] el0_svc+0x30/0x8c [ 110.914958] el0t_64_sync_handler+0x84/0xf0 [ 110.914979] el0t_64_sync+0x18c/0x190 [ 110.914996] ---[ end trace 0000000000000000 ]--- This happens because, although `prepare_fb` and `cleanup_fb` are perfectly balanced, we cannot guarantee consistency in the check plane->state->fb == state->fb. This means that sometimes we can increase the refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The opposite can also be true. In fact, the struct drm_plane .state shouldn't be accessed directly but instead, the `drm_atomic_get_new_plane_state()` helper function should be used. So, we could stick to this check, but using `drm_atomic_get_new_plane_state()`. But actually, this check is not re ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b9f19259b84dc648f207a46f3581d15eeaedf4b6 , < 48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40 (git)
Affected: b9f19259b84dc648f207a46f3581d15eeaedf4b6 , < d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c (git)
Affected: b9f19259b84dc648f207a46f3581d15eeaedf4b6 , < 5343f724c912c77541029123f47ecd3d2ea63bdd (git)
Affected: b9f19259b84dc648f207a46f3581d15eeaedf4b6 , < 5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9 (git)
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    Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.1.86 , ≤ 6.1.* (semver)
Unaffected: 6.6.27 , ≤ 6.6.* (semver)
Unaffected: 6.8.6 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "vulnrichment": {
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use-after-free.\\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\\n[  110.909170] sp : ffffffc00913b9c0\\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\\n[  110.909434] Call trace:\\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\\n[  110.914873]  invoke_syscall+0x4c/0x114\\n[  110.914897]  el0_svc_common+0xd0/0x118\\n[  110.914917]  do_el0_svc+0x38/0xd0\\n[  110.914936]  el0_svc+0x30/0x8c\\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\\n[  110.914979]  el0t_64_sync+0x18c/0x190\\n[  110.914996] ---[ end trace 0000000000000000 ]---\\n\\nThis happens because, although `prepare_fb` and `cleanup_fb` are\\nperfectly balanced, we cannot guarantee consistency in the check\\nplane-\u003estate-\u003efb == state-\u003efb. This means that sometimes we can increase\\nthe refcount in `prepare_fb` and don\u0027t decrease it in `cleanup_fb`. The\\nopposite can also be true.\\n\\nIn fact, the struct drm_plane .state shouldn\u0027t be accessed directly\\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\\nbe used. So, we could stick to this check, but using\\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.86\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.27\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.6\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:35:46.203Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35932\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:35:46.203Z\", \"dateReserved\": \"2024-05-17T13:50:33.130Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-19T10:10:40.353Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.