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CVE-2026-64219— drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

CVSS 7.0 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProductVersion RangeStatus
LinuxLinux4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< d6590e3f766e3111dd1beaf88b9384d117acfa6baffected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 16a5fa57565afb6bf37e18129921c270c93d8e2baffected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 90c398e822ca76e40548df0c061dd4f93ea92d71affected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 3265f3ed373fb8048be713aadcdf702579a0e53daffected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 1ecde19bfce6535bffddad1139ff466b6d401b8eaffected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 1c8c6e912f2945b2a3e669afca6b52174b88e86eaffected
4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6< 6c92f6d9600efa3ef0d9e560a2b52776d9803c29affected
5.13affected
… +8 more rows
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I. Basic Information for CVE-2026-64219

Vulnerability Information
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Vulnerability Title
drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于未对payload长度和link_index进行边界检查，可能导致栈缓冲区溢出和越界访问。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 ~ d6590e3f766e3111dd1beaf88b9384d117acfa6b -
LinuxLinux 5.13 -

II. Public POCs for CVE-2026-64219

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III. Intelligence Information for CVE-2026-64219

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Patches & Fixes for CVE-2026-64219 (7)

Same Patch Batch · Linux · 2026-07-24 · 48 CVEs total

CVE-2026-642329.8 CRITICALblock: recompute nr_integrity_segments in blk_insert_cloned_request
CVE-2026-642169.8 CRITICALnetfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
CVE-2026-642558.8 HIGHwifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
CVE-2026-642478.4 HIGHKVM: x86: hyper-v: Bound the bank index when querying sparse banks
CVE-2026-642358.1 HIGHx86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
CVE-2026-642238.1 HIGHwifi: mac80211: consume only present negotiated TTLM maps
CVE-2026-642267.8 HIGHsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-642217.8 HIGHspi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-642187.8 HIGHbatman-adv: bla: fix report_work leak on backbone_gw purge
CVE-2026-642517.8 HIGHpwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
CVE-2026-642177.8 HIGHnetfs: Fix overrun check in netfs_extract_user_iter()
CVE-2026-642087.5 HIGHcrypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
CVE-2026-642107.5 HIGHnet/mlx5e: xsk: Fix unlocked writing to ICOSQ
CVE-2026-642437.1 HIGHASoC: codecs: simple-mux: Fix enum control bounds check
CVE-2026-642227.0 HIGHocteontx2-pf: avoid double free of pool->stack on AQ init failure
CVE-2026-64248MIPS: smp: report dying CPU to RCU in stop_this_cpu()
CVE-2026-64250LoongArch: Report dying CPU to RCU in stop_this_cpu()
CVE-2026-64249fpga: region: fix use-after-free in child_regions_with_firmware()
CVE-2026-64220device property: set fwnode->secondary to NULL in fwnode_init()
CVE-2026-64224octeontx2-pf: fix double free in rvu_rep_rsrc_init()

Showing top 20 of 48 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64219

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