PT-2026-64857 · Linux · Linux

CVE-2026-64533

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Publicado

2026-07-27

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Atualizado

2026-07-27

Nenhuma

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In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: validate lcns follow in log replay conversion
log replay() converts DIR PAGE ENTRY 32 records into DIR PAGE ENTRY records when replaying version 0 restart tables.
During this conversion, the memmove() length is derived directly from the on-disk lcns follow field:
memmove(&dp->vcn, &dp0->vcn low,
	2 * sizeof(u64) +
			le32 to cpu(dp->lcns follow) * sizeof(u64));
check rstbl() validates restart table structure, but does not constrain per-entry lcns follow values relative to the entry size. A malformed filesystem image can provide an oversized lcns follow value, causing the conversion memmove() to access memory beyond the bounds of the allocated restart table buffer.
The same field is later used to bound iteration over page lcns[], so validating lcns follow during conversion also prevents downstream out-of-bounds access from the same malformed metadata.
Compute the maximum valid lcns follow from the already-validated restart table entry size and reject entries that exceed this bound. Reuse the existing t16/t32 scratch variables already declared in log replay() to avoid introducing new declarations.
[almaz.alexandrovich@paragon-software.com: fixed the conflicts]
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Identificadores relacionados

CVE-2026-64533

Produtos afetados

Linux