Medium [CVE-2026-64322] validate sparing table length as an entry count, not a byte count
This medium-severity Red Hat Linux advisory covers CVE-2026-64322 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
In the Linux kernel, the following vulnerability has been resolved: udf: validate sparing table length as an entry count, not a byte count udf_load_sparable_map() accepts a sparing table when sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > sb->s_blocksize is false, i.e. it treats reallocationTableLen as a number of BYTES that must fit in the block.
But the table is walked as an array of 8-byte sparingEntry elements: for (i = 0; i reallocationTableLen); i++) { struct sparingEntry *entry = &st->mapEntry[i];... entry->origLocation... } in udf_get_pblock_spar15() and udf_relocate_blocks(). A reallocationTableLen of N therefore passes the check whenever sizeof(*st) + N mapEntry[] is an out-of-bounds write.
A flaw was found in the Linux kernel's Universal Disk Format (UDF) filesystem. This can lead to memory corruption, potentially resulting in a denial of service or arbitrary code execution.
This issue is triggered by a specially crafted disk image containing on-disk metadata inconsistencies. Exploitation requires that an attacker convince a user to download and use a malicious image from an untrusted source, a scenario with limited practical impact.
Red Hat rates this as Low severity. Weakness: CWE-125.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 2 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 10 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 10 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 10 hours ago·verify at source
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