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CVE-2025-40304— fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds

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，该漏洞源于缺少边界检查，可能导致越界写入。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 996bfaa7372d6718b6d860bdf78f6618e850c702 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f0982400648a3e00580253e0c48e991f34d2684c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ebc0730b490c7f27340b1222e01dd106e820320d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 86df8ade88d290725554cefd03101ecd0fbd3752 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 15ba9acafb0517f8359ca30002c189a68ddbb939 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2d1359e11674ed4274934eac8a71877ae5ae7bbb affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3637d34b35b287ab830e66048841ace404382b67 affected
… +10 more rows
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I. Basic Information for CVE-2025-40304

Vulnerability Information
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Vulnerability Title
fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if the Y position is off-screen and clip image height to screen boundary. Break from the rendering loop if the X position is off-screen. When clipping image width to fit the screen, update the character count to match the clipped width to prevent buffer size mismatches. Without the character count update, bit_putcs_aligned and bit_putcs_unaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.
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，该漏洞源于缺少边界检查，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 ~ 996bfaa7372d6718b6d860bdf78f6618e850c702 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-40304

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III. Intelligence Information for CVE-2025-40304

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Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total

CVE-2023-53751 9.8 CRITICAL cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
CVE-2025-40320 9.8 CRITICAL smb: client: fix potential cfid UAF in smb2_query_info_compound
CVE-2023-53769 9.3 CRITICAL virt/coco/sev-guest: Double-buffer messages
CVE-2023-53764 8.8 HIGH wifi: ath12k: Handle lock during peer_id find
CVE-2023-53762 8.8 HIGH Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync
CVE-2025-40318 8.8 HIGH Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
CVE-2025-40292 8.4 HIGH virtio-net: fix received length check in big packets
CVE-2025-40309 8.0 HIGH Bluetooth: SCO: Fix UAF on sco_conn_free
CVE-2025-40303 7.8 HIGH btrfs: ensure no dirty metadata is written back for an fs with errors
CVE-2025-40291 7.8 HIGH io_uring: fix regbuf vector size truncation
CVE-2025-40290 7.8 HIGH xsk: avoid data corruption on cq descriptor number
CVE-2023-53759 7.8 HIGH HID: hidraw: fix data race on device refcount
CVE-2025-40317 7.8 HIGH regmap: slimbus: fix bus_context pointer in regmap init calls
CVE-2025-40319 7.8 HIGH bpf: Sync pending IRQ work before freeing ring buffer
CVE-2025-40323 7.8 HIGH fbcon: Set fb_display[i]->mode to NULL when the mode is released
CVE-2023-53753 7.8 HIGH drm/amd/display: fix mapping to non-allocated address
CVE-2023-53752 7.8 HIGH net: deal with integer overflows in kmalloc_reserve()
CVE-2023-53747 7.8 HIGH vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF
CVE-2022-50623 7.8 HIGH fpga: prevent integer overflow in dfl_feature_ioctl_set_irq()
CVE-2022-50630 7.8 HIGH mm: hugetlb: fix UAF in hugetlb_handle_userfault

Showing top 20 of 82 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40304

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