CVE-2024-36943 (GCVE-0-2024-36943)

Vulnerability from cvelistv5 – Published: 2024-05-30 15:35 – Updated: 2025-05-04 09:12
VLAI?
Title
fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan make_uffd_wp_pte() was previously doing: pte = ptep_get(ptep); ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep, pte); But if another thread accessed or dirtied the pte between the first 2 calls, this could lead to loss of that information. Since ptep_modify_prot_start() gets and clears atomically, the following is the correct pattern and prevents any possible race. Any access after the first call would see an invalid pte and cause a fault: pte = ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep, pte);
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 52526ca7fdb905a768a93f8faa418e9b988fc34b , < 74b3d66f91d9f539f99faad74d796fa9a389a015 (git)
Affected: 52526ca7fdb905a768a93f8faa418e9b988fc34b , < c70dce4982ce1718bf978a35f8e26160b82081f4 (git)
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    Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.8.10 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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