CVE-2025-38685fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
Updated under an hour ago ()
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It affects Linux and 4 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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Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit This issue triggers when a userspace program does an ioctl FBIOPUT_CON2FBMAP by passing console number and frame buffer number. Ideally this maps console to frame buffer and updates the screen if console is visible. As part of mapping it has to do resize of console according to frame buffer info. if this resize fails and returns from vc_do_resize() and continues further. At this point console and new frame buffer are mapped and sets display vars. Despite failure still it continue to proceed updating the screen at later stages where vc_data is related to previous frame buffer and frame buffer info and display vars are mapped to new frame buffer and eventully leading to out-of-bounds write in fast_imageblit(). This bheviour is excepted only when fg_console is equal to requested console which is a visible console and updates screen with invalid struct references in fbcon_putcs().
- 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
- Not yet received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 078e62bffca4b7e72e8f3550eb063ab981c36c7a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4c4d7ddaf1d43780b106bedc692679f965dc5a3a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 27b118aebdd84161c8ff5ce49d9d536f2af10754; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ed9b8e5016230868c8d813d9179523f729fec8c6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cfec17721265e72e50cc69c6004fe3475cd38df2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before af0db3c1f898144846d4c172531a199bb3ca375d | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
References
- https://git.kernel.org/stable/c/078e62bffca4b7e72e8f3550eb063ab981c36c7a
- https://git.kernel.org/stable/c/4c4d7ddaf1d43780b106bedc692679f965dc5a3a
- https://git.kernel.org/stable/c/27b118aebdd84161c8ff5ce49d9d536f2af10754
- https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6
- https://git.kernel.org/stable/c/56701bf9eeb63219e378cb7fcbd066ea4eaeeb50
- https://git.kernel.org/stable/c/cfec17721265e72e50cc69c6004fe3475cd38df2
- https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d
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.