CVE-2026-64533High· 7.8▾ TwilightIn 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 ta…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
0.1% → 0.1%
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.
[[email protected]: fixed the conflicts]
Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < ca343a99806b4fc8e27c48f08be3445c5fcd1445Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < ddfc8683e1a627dbf1b83bacf8961443dd654258Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 57c071e2c4f30b9c6f5aacb6679aab1269fbae99Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 159f694d682e4215b3822ae31ed3a4631628fe55Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 7adb38279812c9c06b0e3fa7382f4d7887f3fa2dLinux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 32b9f8733feb241627fa5f564b1a99b5cae974c5Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 6a4c53a2e26a865565bd6a460961e8d6fcb32329Linux 5.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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