CVE-2024-26850: mm/debug_vm_pgtable: fix BUG_ON with pud advanced test
First published: Wed Apr 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mm/debug_vm_pgtable: fix BUG_ON with pud advanced test Architectures like powerpc add debug checks to ensure we find only devmap PUD pte entries. These debug checks are only done with CONFIG_DEBUG_VM. This patch marks the ptes used for PUD advanced test devmap pte entries so that we don't hit on debug checks on architecture like ppc64 as below. WARNING: CPU: 2 PID: 1 at arch/powerpc/mm/book3s64/radix_pgtable.c:1382 radix__pud_hugepage_update+0x38/0x138 .... NIP [c0000000000a7004] radix__pud_hugepage_update+0x38/0x138 LR [c0000000000a77a8] radix__pudp_huge_get_and_clear+0x28/0x60 Call Trace: [c000000004a2f950] [c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable) [c000000004a2f980] [000d34c100000000] 0xd34c100000000 [c000000004a2f9a0] [c00000000206ba98] pud_advanced_tests+0x118/0x334 [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388 Also kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:202! .... NIP [c000000000096510] pudp_huge_get_and_clear_full+0x98/0x174 LR [c00000000206bb34] pud_advanced_tests+0x1b4/0x334 Call Trace: [c000000004a2f950] [000d34c100000000] 0xd34c100000000 (unreliable) [c000000004a2f9a0] [c00000000206bb34] pud_advanced_tests+0x1b4/0x334 [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| >=6.6<6.6.21 | ||
| >=6.7<6.7.9 | ||
| =6.8-rc1 | ||
| =6.8-rc2 | ||
| =6.8-rc3 | ||
| =6.8-rc4 | ||
| =6.8-rc5 | ||
| =6.8-rc6 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-26850?
CVE-2024-26850 has a medium severity rating due to its impact on the Linux kernel's functionality.
How do I fix CVE-2024-26850?
To fix CVE-2024-26850, update your Linux kernel to the patched version provided by your distribution.
Which versions of the Linux kernel are affected by CVE-2024-26850?
CVE-2024-26850 affects specific versions of the Linux kernel where CONFIG_DEBUG_VM is enabled.
What systems are at risk due to CVE-2024-26850?
Systems running the affected versions of the Linux kernel on architectures like powerpc are at risk.
What is the nature of the issue in CVE-2024-26850?
CVE-2024-26850 involves a BUG_ON condition triggered by debug checks in the memory management of the Linux kernel.
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