drm/buddy: Prevent BUG_ON by validating rounded allocation
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Configuration 1 [-]
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Ubuntu USN |
USN-8492-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8492-2 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8497-1 | Linux kernel (Low Latency) vulnerabilities |
Ubuntu USN |
USN-8498-1 | Linux kernel (NVIDIA Tegra) vulnerabilities |
Ubuntu USN |
USN-8499-1 | Linux kernel (Xilinx) vulnerabilities |
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USN-8492-3 | Linux kernel (Raspberry Pi Real-time) vulnerabilities |
Ubuntu USN |
USN-8492-4 | Linux kernel (Raspberry Pi) vulnerabilities |
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USN-8492-5 | Linux kernel (FIPS) vulnerabilities |
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USN-8606-1 | Linux kernel (Azure) vulnerabilities |
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USN-8607-1 | Linux kernel (Azure CVM) vulnerabilities |
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USN-8609-1 | Linux kernel (Azure CVM) vulnerabilities |
Ubuntu USN |
USN-8619-1 | Linux kernel (HWE) vulnerabilities |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.127% probability within 30 days)
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cvssV3_1
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cvssV3_1
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| Weaknesses | CWE-190 |
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| Weaknesses | CWE-131 | |
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cvssV3_1
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| Weaknesses | CWE-190 |
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| Description | In the Linux kernel, the following vulnerability has been resolved: drm/buddy: Prevent BUG_ON by validating rounded allocation When DRM_BUDDY_CONTIGUOUS_ALLOCATION is set, the requested size is rounded up to the next power-of-two via roundup_pow_of_two(). Similarly, for non-contiguous allocations with large min_block_size, the size is aligned up via round_up(). Both operations can produce a rounded size that exceeds mm->size, which later triggers BUG_ON(order > mm->max_order). Example scenarios: - 9G CONTIGUOUS allocation on 10G VRAM memory: roundup_pow_of_two(9G) = 16G > 10G - 9G allocation with 8G min_block_size on 10G VRAM memory: round_up(9G, 8G) = 16G > 10G Fix this by checking the rounded size against mm->size. For non-contiguous or range allocations where size > mm->size is invalid, return -EINVAL immediately. For contiguous allocations without range restrictions, allow the request to fall through to the existing __alloc_contig_try_harder() fallback. This ensures invalid user input returns an error or uses the fallback path instead of hitting BUG_ON. v2: (Matt A) - Add Fixes, Cc stable, and Closes tags for context | |
| Title | drm/buddy: Prevent BUG_ON by validating rounded allocation | |
| First Time appeared |
Linux
Linux linux Kernel |
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| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
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Linux
Linux linux Kernel |
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