CVE-2022-48898
drm/msm/dp: do not complete dp_aux_cmd_fifo_tx() if irq is not for aux transfer
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: drm/msm/dp: do not complete dp_aux_cmd_fifo_tx() if irq is not for aux transfer There are 3 possible interrupt sources are handled by DP controller, HPDstatus, Controller state changes and Aux read/write transaction. At every irq, DP controller have to check isr status of every interrupt sources and service the interrupt if its isr status bits shows interrupts are pending. There is potential race condition may happen at current aux isr handler implementation since it is always complete dp_aux_cmd_fifo_tx() even irq is not for aux read or write transaction. This may cause aux read transaction return premature if host aux data read is in the middle of waiting for sink to complete transferring data to host while irq happen. This will cause host's receiving buffer contains unexpected data. This patch fixes this problem by checking aux isr and return immediately at aux isr handler if there are no any isr status bits set. Current there is a bug report regrading eDP edid corruption happen during system booting up. After lengthy debugging to found that VIDEO_READY interrupt was continuously firing during system booting up which cause dp_aux_isr() to complete dp_aux_cmd_fifo_tx() prematurely to retrieve data from aux hardware buffer which is not yet contains complete data transfer from sink. This cause edid corruption. Follows are the signature at kernel logs when problem happen, EDID has corrupt header panel-simple-dp-aux aux-aea0000.edp: Couldn't identify panel via EDID Changes in v2: -- do complete if (ret == IRQ_HANDLED) ay dp-aux_isr() -- add more commit text Changes in v3: -- add Stephen suggested -- dp_aux_isr() return IRQ_XXX back to caller -- dp_ctrl_isr() return IRQ_XXX back to caller Changes in v4: -- split into two patches Changes in v5: -- delete empty line between tags Changes in v6: -- remove extra "that" and fixed line more than 75 char at commit text Patchwork: https://patchwork.freedesktop.org/patch/516121/
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Weakness
Affected products
- affected c943b4948b5848fc0e07f875edbd35a973879e22 – < 785607e5e6fb52caf141e4580de40405565f04f1
- affected c943b4948b5848fc0e07f875edbd35a973879e22 – < 984ad875db804948c86ca9e1c2e784ae8252715a
- affected c943b4948b5848fc0e07f875edbd35a973879e22 – < b7dcbca46db3c77fdb02c2a9d6239e5aa3b06a59
- affected c943b4948b5848fc0e07f875edbd35a973879e22 – < 1cba0d150fa102439114a91b3e215909efc9f169
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.164 – ≤ 5.10.*
- unaffected 5.15.89 – ≤ 5.15.*
- unaffected 6.1.7 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References (4)
- https://git.kernel.org/stable/c/785607e5e6fb52caf141e4580de40405565f04f1 (opens in a new tab)
- https://git.kernel.org/stable/c/984ad875db804948c86ca9e1c2e784ae8252715a (opens in a new tab)
- https://git.kernel.org/stable/c/b7dcbca46db3c77fdb02c2a9d6239e5aa3b06a59 (opens in a new tab)
- https://git.kernel.org/stable/c/1cba0d150fa102439114a91b3e215909efc9f169 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-48898)Record last updated .