In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy()
In split_large_buddy(), we might call pfn_to_page() on a PFN that might not exist. In corner cases, such as when freeing the highest pageblock in the last memory section, this could result with CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and and __section_mem_map_addr() dereferencing that NULL pointer.
Let's fix it, and avoid doing a pfn_to_page() call for the first iteration, where we already have the page.
So far this was found by code inspection, but let's just CC stable as the fix is easy.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jan 11, 2025 |
| Ubuntu | — | Upgrade linux-image-realtimeUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-lowlatencyUpgrade linux-image-gcpUpgrade linux-image-oem-24.04bUpgrade linux-image-6.11.0-1011-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-virtualUpgrade linux-image-genericUpgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1010-raspiUpgrade linux-image-6.11.0-1013-oracle-64kUpgrade linux-image-6.11.0-1007-realtimeUpgrade linux-image-azureUpgrade linux-image-azure-fdeUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-raspiUpgrade linux-image-6.11.0-1011-awsUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-21-generic-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-21-genericUpgrade linux-image-6.11.0-1011-gcpUpgrade linux-image-6.11.0-1011-gcp-64kUpgrade linux-image-generic-64kUpgrade linux-image-6.11.0-1012-azureUpgrade linux-image-6.11.0-1011-lowlatencyUpgrade linux-image-6.11.0-1013-oracleUpgrade linux-image-awsUpgrade linux-image-6.11.0-1017-oemUpgrade linux-image-6.11.0-1012-azure-fde | Mar 28, 2025 | Jan 11, 2025 |
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