Riskcovery

CVE-2024-26850

mm/debug_vm_pgtable: fix BUG_ON with pud advanced test

State
Published
Severity
Not scored
Published
Apr 17, 2024
Updated
May 11, 2026
Reserved
Feb 19, 2024

Read the record on cve.org

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 27af67f35631ac4b61b5e4455b44c9aee8d2cc4b to before d2a9510c0e39d06f5544075c13040407bdbf2803Affected
  • 27af67f35631ac4b61b5e4455b44c9aee8d2cc4b to before eeeddf85fc58d48c58ad916e4ca12363ebd8ab21Affected
  • 27af67f35631ac4b61b5e4455b44c9aee8d2cc4b to before 720da1e593b85a550593b415bf1d79a053133451Affected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.21 through 6.6.*Not affected
  • 6.7.9 through 6.7.*Not affected
  • 6.8 and laterNot affected

References

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