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CVE-2026-90035— drm/amd/display: fix division by zero in get_estimated_bw()

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.

在 Linux 内核中，以下漏洞已得到修复： drm/amd/display: 修复 get_estimated_bw() 中的除零错误 函数会对 进行除法运算，但该字段会被 置零，并且只有在处理过 事件后才会被赋值。 作为 DPCD 中断处理函数，每当检测到 标志时都会调用 ，而不管该链路是否曾触发过 。如果一个已连接的 USB4/DPIA 隧道设备在报告带宽能力变化之前先报告了估计带宽变化，就会在此中断处理路径中引发除零错误。 函数中已经包含了对同一 除法的保护逻辑；因此，此处应添加与之一致的保护判断，而不是引

AI Predicted 5.5 Difficulty: Hard EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1582

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 8e5cfe547bf3beeb29d9608be68d22dff2b5012b< 4c5b61b9df6ab33b55f228e1b6579cefad11a9f7 affected
8e5cfe547bf3beeb29d9608be68d22dff2b5012b< ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a affected
8e5cfe547bf3beeb29d9608be68d22dff2b5012b< 4814f28c45f58a71a80d09b80a60da6a063b539a affected
8e5cfe547bf3beeb29d9608be68d22dff2b5012b< b08c3d5ee7feadd821208f7c2c1ec02a16ce5878 affected
8e5cfe547bf3beeb29d9608be68d22dff2b5012b< f63de9054da858d57054474c32464106f8375e0d affected
6.3 affected
< 6.3 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-90035

Vulnerability Information
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Vulnerability Title
drm/amd/display: fix division by zero in get_estimated_bw()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix division by zero in get_estimated_bw() get_estimated_bw() divides by link->dpia_bw_alloc_config.bw_granularity, which is zeroed by reset_bw_alloc_struct() and only populated once DP_TUNNELING_BW_ALLOC_CAP_CHANGED has been handled. link_dp_dpia_handle_bw_alloc_status(), the DPCD interrupt handler, calls get_estimated_bw() whenever DP_TUNNELING_ESTIMATED_BW_CHANGED is set, independently of whether DP_TUNNELING_BW_ALLOC_CAP_CHANGED has ever fired for that link. A connected USB4/DPIA tunneling device that reports an estimated-bandwidth change before ever reporting a capability change drives a division by zero in this IRQ path. link_dpia_send_bw_alloc_request() already guards the same bw_granularity division; add the identical guard here rather than introducing a new pattern. (cherry picked from commit f2a961457c33dc34223aad5c9e8971de34a4eed3)
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ~ 4c5b61b9df6ab33b55f228e1b6579cefad11a9f7 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-90035

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III. Intelligence Information for CVE-2026-90035

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Other References for CVE-2026-90035 (5)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89918 9.3 CRITICAL KVM: arm64: Correctly handle end of VA space TLBI invalidation

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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