Vulnerability Details CVE-2024-36943
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);
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.8%
CVSS Severity
CVSS v3 Score 4.7
References
Products affected by CVE-2024-36943
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cpe:2.3:o:linux:linux_kernel:6.7
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cpe:2.3:o:linux:linux_kernel:6.7.1
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cpe:2.3:o:linux:linux_kernel:6.7.10
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cpe:2.3:o:linux:linux_kernel:6.7.11
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cpe:2.3:o:linux:linux_kernel:6.7.12
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cpe:2.3:o:linux:linux_kernel:6.7.2
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cpe:2.3:o:linux:linux_kernel:6.7.3
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cpe:2.3:o:linux:linux_kernel:6.7.4
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cpe:2.3:o:linux:linux_kernel:6.7.5
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cpe:2.3:o:linux:linux_kernel:6.7.6
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cpe:2.3:o:linux:linux_kernel:6.7.7
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cpe:2.3:o:linux:linux_kernel:6.7.8
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cpe:2.3:o:linux:linux_kernel:6.7.9
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cpe:2.3:o:linux:linux_kernel:6.8
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cpe:2.3:o:linux:linux_kernel:6.8.1
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cpe:2.3:o:linux:linux_kernel:6.8.2
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cpe:2.3:o:linux:linux_kernel:6.8.3
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cpe:2.3:o:linux:linux_kernel:6.8.4
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cpe:2.3:o:linux:linux_kernel:6.8.5
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cpe:2.3:o:linux:linux_kernel:6.8.6
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cpe:2.3:o:linux:linux_kernel:6.8.7
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cpe:2.3:o:linux:linux_kernel:6.8.8
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cpe:2.3:o:linux:linux_kernel:6.8.9
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cpe:2.3:o:linux:linux_kernel:6.9