CVE-2024-42304ext4: make sure the first directory block is not a hole
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ext4: make sure the first directory block is not a hole The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow. ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh && (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported. After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash. Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3a17ca864baffc0c6f6e8aad525aa4365775a193 before d81d7e347d1f1f48a5634607d39eb90c161c8afe; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before e02f9941e8c011aa3eafa799def6a134ce06bcfa; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before de2a011a13a46468a6e8259db58b1b62071fe136; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before 9771e3d8365ae1dd5e8846a204cb9af14e3e656a; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before b609753cbbd38f8c0affd4956c0af178348523ac; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before c3893d9de8ee153baac56d127d844103488133b5; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before 299bc6ffa57e04e74c6cce866d6c0741fb4897a1; from 4e19d6b65fb4fc42e352ce9883649e049da14743 before f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6; and 9 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.9.187 before 4.10; from 4.14.135 before 4.15; from 4.19.62 before 4.19.320; from 5.1.21 before 5.2; from 5.2.4 before 5.4.282; from 5.5 before 5.10.224; from 5.11 before 5.15.165; from 5.16 before 6.1.103; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afepatch
- https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfapatch
- https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136patch
- https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656apatch
- https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523acpatch
- https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5patch
- https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1patch
- https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6patch
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.