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CVE-2026-93067— drm/bridge: tc358767: clamp the reported AUX read size to the request

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，已修复以下漏洞： drm/bridge: tc358767: 将报告到的 AUX 读取大小限制在请求范围内 函数最初会将 AUX 读取操作限制在最大负载大小内： 在传输完成后，该函数会用控制器在 字段中报告的字节数来替换 的值： 其中， 定义为 ，因此其值最大可达 255。然而，代码中没有将该值重新限制回原始请求的大小。随后， 函数会根据这个报告的大小，从 16 字节的栈上缓冲区 中读取相应数量的字节，并将其复制到调用者提供的缓冲区中。如果报告的大小为 255，则实际读取操作将尝试读取 25

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 12dfe7c4d9c53442efcb4113cff505f60d654906< ebf00c51c9ac9188e2806a2b842418805ee879be affected
12dfe7c4d9c53442efcb4113cff505f60d654906< 424b762cc26d512e3e7421e57e41b4b55be2400b affected
12dfe7c4d9c53442efcb4113cff505f60d654906< dd6274706bec30d005bff0587a4262d01dc2775a affected
12dfe7c4d9c53442efcb4113cff505f60d654906< 982caa744fce79d18f2920382aaeb0da821a6e73 affected
12dfe7c4d9c53442efcb4113cff505f60d654906< 33c0b072e31dee98a754d9bd01800359dfeb9e8f affected
12dfe7c4d9c53442efcb4113cff505f60d654906< 57c567e0e8aa76f6e3e8f39d7f40c20bc37e76af affected
12dfe7c4d9c53442efcb4113cff505f60d654906< 9ff718df547372d70ca20ad8e66a3fb1300936b2 affected
12dfe7c4d9c53442efcb4113cff505f60d654906< ec6444a00c49e6c2b5e9a507272a28126677f9ee affected
… +10 more rows
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I. Basic Information for CVE-2026-93067

Vulnerability Information
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Vulnerability Title
drm/bridge: tc358767: clamp the reported AUX read size to the request
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/bridge: tc358767: clamp the reported AUX read size to the request tc_aux_transfer() clamps an AUX read to the payload limit: size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); After the transfer it replaces size with the byte count the controller reports in AUX_BYTES: if (size) size = FIELD_GET(AUX_BYTES, auxstatus); AUX_BYTES is GENMASK(15, 8), so it can be up to 255. Nothing clamps it back to the request. tc_aux_read_data() reads that many bytes into the 16-byte auxrdata stack buffer, then copies them into the caller buffer. A reported count of 255 makes the read run to 256 bytes and overruns both. The controller should never report more than it was asked to transfer, so this is defense in depth rather than a live hole. The reported count is only lightly trusted, and the check is cheap. Clamp it back to the request, the same way ti-sn65dsi86 does in commit aca58eac52b8 ("drm/bridge: ti-sn65dsi86: Never store more than msg->size bytes in AUX xfer").
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 12dfe7c4d9c53442efcb4113cff505f60d654906 ~ ebf00c51c9ac9188e2806a2b842418805ee879be -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-93067

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III. Intelligence Information for CVE-2026-93067

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Patches & Fixes for CVE-2026-93067 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93067

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