CVE-2021-47142
drm/amdgpu: Fix a use-after-free
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix a use-after-free looks like we forget to set ttm->sg to NULL. Hit panic below [ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sg_free_table+0x17/0x20 [ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm] [ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm] [ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 84% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < 0707c3fea8102d211631ba515ef2159707561b0d
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < 3293cf3513d69f00c14d43e2020826d45ea0e46a
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < 952ab3f9f48eb0e8050596d41951cf516be6b122
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < a849e218556f932576c0fb1c5a88714b61709a17
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < 7398c2aab4da960761ec182d04d6d5abbb4a226e
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < f98cdf084405333ee2f5be548a91b2d168e49276
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < d4ea141fd4b40636a8326df5a377d9c5cf9b3faa
- affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 – < 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2
- affected 4.2
- unaffected < 4.2
- unaffected 4.4.271 – ≤ 4.4.*
- unaffected 4.9.271 – ≤ 4.9.*
- unaffected 4.14.235 – ≤ 4.14.*
- unaffected 4.19.193 – ≤ 4.19.*
- unaffected 5.4.124 – ≤ 5.4.*
- unaffected 5.10.42 – ≤ 5.10.*
- unaffected 5.12.9 – ≤ 5.12.*
- unaffected 5.13 – ≤ *
References (8)
- https://git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3293cf3513d69f00c14d43e2020826d45ea0e46a (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/952ab3f9f48eb0e8050596d41951cf516be6b122 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/a849e218556f932576c0fb1c5a88714b61709a17 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/7398c2aab4da960761ec182d04d6d5abbb4a226e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f98cdf084405333ee2f5be548a91b2d168e49276 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d4ea141fd4b40636a8326df5a377d9c5cf9b3faa (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/1e5c37385097c35911b0f8a0c67ffd10ee1af9a2 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-47142)Record last updated .