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CVE-2025-38685— fbdev: Fix vmalloc out-of-bounds write in fast_imageblit

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于调整大小失败后继续更新屏幕，可能导致越界写入。

CVSS 7.8 · High EPSS 0.18% · P7

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 078e62bffca4b7e72e8f3550eb063ab981c36c7a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4c4d7ddaf1d43780b106bedc692679f965dc5a3a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 27b118aebdd84161c8ff5ce49d9d536f2af10754 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ed9b8e5016230868c8d813d9179523f729fec8c6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cfec17721265e72e50cc69c6004fe3475cd38df2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< af0db3c1f898144846d4c172531a199bb3ca375d affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2025-38685

Vulnerability Information
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Vulnerability Title
fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
Source: CVE Program / CVE List V5
Vulnerability Description
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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于调整大小失败后继续更新屏幕，可能导致越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 078e62bffca4b7e72e8f3550eb063ab981c36c7a -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-38685

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III. Intelligence Information for CVE-2025-38685

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Same Patch Batch · Linux · 2025-09-04 · 52 CVEs total

CVE-2025-38708 9.8 CRITICAL drbd: add missing kref_get in handle_write_conflicts
CVE-2025-38724 9.8 CRITICAL nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
CVE-2025-38728 9.1 CRITICAL smb3: fix for slab out of bounds on mount to ksmbd
CVE-2025-38688 8.8 HIGH iommufd: Prevent ALIGN() overflow
CVE-2025-38697 7.8 HIGH jfs: upper bound check of tree index in dbAllocAG
CVE-2025-38722 7.8 HIGH habanalabs: fix UAF in export_dmabuf()
CVE-2025-38718 7.8 HIGH sctp: linearize cloned gso packets in sctp_rcv
CVE-2025-38717 7.8 HIGH net: kcm: Fix race condition in kcm_unattach()
CVE-2025-38715 7.8 HIGH hfs: fix slab-out-of-bounds in hfs_bnode_read()
CVE-2025-38710 7.8 HIGH gfs2: Validate i_depth for exhash directories
CVE-2025-38730 7.8 HIGH io_uring/net: commit partial buffers on retry
CVE-2025-38703 7.8 HIGH drm/xe: Make dma-fences compliant with the safe access rules
CVE-2025-38714 7.8 HIGH hfsplus: fix slab-out-of-bounds in hfsplus_bnode_read()
CVE-2025-38679 7.3 HIGH media: venus: Fix OOB read due to missing payload bound check
CVE-2025-38687 7.3 HIGH comedi: fix race between polling and detaching
CVE-2025-38707 7.1 HIGH fs/ntfs3: Add sanity check for file name
CVE-2025-38713 7.1 HIGH hfsplus: fix slab-out-of-bounds read in hfsplus_uni2asc()
CVE-2025-38696 MIPS: Don't crash in stack_top() for tasks without ABI or vDSO
CVE-2025-38681 mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()
CVE-2025-38694 media: dvb-frontends: dib7090p: fix null-ptr-deref in dib7090p_rw_on_apb()

Showing top 20 of 52 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38685

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