# CVE-2024-26850: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/debug_vm_pgtable: fix BUG_ON with pud advance...

CVE-2024-26850 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26850, released April 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26850
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2024

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.9-1 | [DEBIAN-CVE-2024-26850](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26850.md) | Apr 17, 2024 |
| Linux | linux Debian 14 | 6.7.9-1 | [DEBIAN-CVE-2024-26850](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26850.md) | Apr 17, 2024 |

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