CVE-2024-50015ext4: dax: fix overflowing extents beyond inode size when partially writing
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ext4: dax: fix overflowing extents beyond inode size when partially writing The dax_iomap_rw() does two things in each iteration: map written blocks and copy user data to blocks. If the process is killed by user(See signal handling in dax_iomap_iter()), the copied data will be returned and added on inode size, which means that the length of written extents may exceed the inode size, then fsck will fail. An example is given as: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // round 1 ext4_iomap_begin ext4_iomap_alloc // allocate 0~2M extents(written flag) dax_iomap_iter // copy 2M data iomap_iter // round 2 iomap_iter_advance iter->pos += iter->processed // iter->pos = 2M ext4_iomap_begin ext4_iomap_alloc // allocate 2~4M extents(written flag) dax_iomap_iter fatal_signal_pending done = iter->pos - iocb->ki_pos // done = 2M ext4_handle_inode_extension ext4_update_inode_size // inode size = 2M fsck reports: Inode 13, i_size is 2097152, should be 4194304. Fix? Fix the problem by truncating extents if the written length is smaller than expected.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 776722e85d3b0936253ecc3d14db4fba37f191ba before f8a7c342326f6ad1dfdb30a18dd013c70f5e9669; 776722e85d3b0936253ecc3d14db4fba37f191ba builds before 8c30a9a8610c314554997f86370140746aa35661; from 776722e85d3b0936253ecc3d14db4fba37f191ba before abfaa876b948baaea4d14f21a1963789845c8b4c; 776722e85d3b0936253ecc3d14db4fba37f191ba builds before 5efccdee4a7d507a483f20f880b809cc4eaef14d; from 776722e85d3b0936253ecc3d14db4fba37f191ba before a9f331f51515bdb3ebc8d0963131af367ef468f6; from 776722e85d3b0936253ecc3d14db4fba37f191ba before ec0dd451e236c46e4858d53e9e82bae7797a7af5; from 776722e85d3b0936253ecc3d14db4fba37f191ba before dda898d7ffe85931f9cca6d702a51f33717c501e | 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 |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.2 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.10 before 5.10.227; from 5.11 before 5.15.168; from 5.16 before 6.1.113; from 6.2 before 6.6.55; from 6.7 before 6.10.14; from 6.11 before 6.11.3 | NVD |
References
- https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669patch
- https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661patch
- https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4cpatch
- https://git.kernel.org/stable/c/5efccdee4a7d507a483f20f880b809cc4eaef14dpatch
- https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6patch
- https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5patch
- https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501epatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.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.