CVE-2026-100073
In the Linux kernel, the following vulnerability has been resolved: ext4: fix transaction overflow during writeback Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent conversion") was correct to note that we need to reserve enough credits for all extents possibly underlying a large folio. However it was too eager to reduce the number of reserved credits. Extent conversion may not only need to touch several leaf extent blocks, it may also need to split extents - for example a single large unwritten extent may need to be split into many small written ones in case of sparse folio dirtying. This can thus result not only in extent leaf modifications but also in a need to allocate new extent tree nodes. As a result the reserved transaction credits were not sufficient in some corner cases. Use ext4_meta_trans_blocks() for correct upper bound credit estimate.
Affected versions
Linux kernel versions
6.16.3,
6.17
and later are affected. Fixed in
7.2.6,
7.3-rc1
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-100073?
CVE-2026-100073 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.16.3 onward and has been patched in 7.2.6 and 7.3-rc1. CVE-2026-100073 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-100073?
Yes. CVE-2026-100073 has been patched. Fixed versions include 7.2.6 and 7.3-rc1. If you are running Linux kernel 6.16.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-100073 actively exploited?
No. CVE-2026-100073 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.