| Name | CVE-2026-72225 |
| Description | In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bookworm | 6.1.176-1 | vulnerable |
| bookworm (security) | 6.1.180-1 | fixed | |
| trixie | 6.12.94-1 | vulnerable | |
| trixie (security) | 6.12.107-1 | fixed | |
| forky | 7.1.12-1 | fixed | |
| sid | 7.1.13-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bookworm | 6.1.180-1 | |||
| linux | source | trixie | 6.12.100-1 | |||
| linux | source | (unstable) | 7.1.5-1 |
https://git.kernel.org/linus/289a2ca0c9b7eae74f93fc213b0b971669b8683d (7.2-rc1)