CVE-2026-64324
CVE-2026-64324: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.
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Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium6.7
Medium [CVE-2026-64324] validate free block extents against the partition length
CVE-2026-64324Source published Source updated
In the Linux kernel, the following vulnerability has been resolved: udf: validate free block extents against the partition length udf_free_blocks() checks the logical block number and count against the partition length, but drops the extent offset from that final bound. A crafted extent can pass the guard while logicalBlockNum + offset + count points past the partition, which later indexes past the space bitmap array. A single ftruncate(2) on a file backed by such an extent reliably panics the kernel. This is a local availability issue. On desktop systems where UDisks/polkit allows the active user to mount removable UDF media without CAP_SYS_ADMIN, an unprivileged local user can supply the crafted filesystem and trigger the panic by truncating a writable file on it. Systems that require…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat package: kernel
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- To prevent the `udf` kernel module from loading, create a modprobe configuration file. 1. Create `/etc/modprobe.d/disable-udf.conf` with: ``` install udf /bin/true blacklist udf ``` 2. Regenerate the initramfs: ```bash dracut -f -v ``` 3. Reboot the system. This action will disable UDF filesystem support, potentially affecting systems that rely on UDF media.
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