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CVE-2026-68445— drm/vc4: Prevent shader BO mappings from becoming writable

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基金会开源的一个操作系统内核。 Linux kernel 4.5版本存在安全漏洞，该漏洞源于vc4_gem_object_mmap()函数对已验证shader BO映射处理不当，在只读路径上未清除VM_MAYWRITE标志，导致用户空间可映射只读后通过mprotect()将其变为可写，从而绕过验证器重写着色器代码。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 463873d5701427f2964a0b4b72c45f1f14b6df87< 9f0ee411fc2d76333d6087c5862ffa907cf7a175 affected
463873d5701427f2964a0b4b72c45f1f14b6df87< 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 affected
463873d5701427f2964a0b4b72c45f1f14b6df87< 6deaa317201851c644c431b57682e54d06b35838 affected
463873d5701427f2964a0b4b72c45f1f14b6df87< fe168ef1d232d734d9998fd74822e2e20930dfff affected
463873d5701427f2964a0b4b72c45f1f14b6df87< 0c9e6367639548307d3f578f6943ce72c9d39087 affected
4.5 affected
< 4.5 unaffected
6.6.148≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-68445

Vulnerability Information
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Vulnerability Title
drm/vc4: Prevent shader BO mappings from becoming writable
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Prevent shader BO mappings from becoming writable vc4_gem_object_mmap() rejects a writable mapping of a validated shader BO, but leaves VM_MAYWRITE set. Userspace can map the BO read-only and then turn it writable with mprotect(). Validated shader BOs must stay read-only: the validator checks the instructions once and the GPU trusts them afterwards. A writable mapping lets userspace rewrite the code after validation, bypassing the validator. Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 already does for its read-only objects.
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基金会开源的一个操作系统内核。 Linux kernel 4.5版本存在安全漏洞，该漏洞源于vc4_gem_object_mmap()函数对已验证shader BO映射处理不当，在只读路径上未清除VM_MAYWRITE标志，导致用户空间可映射只读后通过mprotect()将其变为可写，从而绕过验证器重写着色器代码。
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 463873d5701427f2964a0b4b72c45f1f14b6df87 ~ 9f0ee411fc2d76333d6087c5862ffa907cf7a175 -
Linux Linux 4.5 -

II. Public POCs for CVE-2026-68445

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III. Intelligence Information for CVE-2026-68445

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Patches & Fixes for CVE-2026-68445 (5)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68431 9.1 CRITICAL ksmbd: validate minimum PDU size for transform requests
CVE-2026-68432 8.8 HIGH vxlan: require CAP_NET_ADMIN in the device netns for changelink
CVE-2026-68433 8.6 HIGH libceph: bound get_version reply decode to front len
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68450 btrfs: free mapping node on duplicate reloc root insert
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup
CVE-2026-68434 serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68445

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