CVE-2023-53458media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()
- 5.5MediumCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish() When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered. This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71. We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 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 5.5.
Affected products
- affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 – < f0a06203f2fe63f04311467200c99c4ee1926578
- affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 – < 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1
- affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 – < 5b8e5e28e85a546dfccc3895befe0e823fdd7c89
- affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 – < 47e8b73bc35d7c54642f78e498697692f6358996
- affected 3.18
- unaffected < 3.18
- unaffected 5.15.113 – ≤ 5.15.*
- unaffected 6.1.30 – ≤ 6.1.*
- unaffected 6.3.4 – ≤ 6.3.*
- unaffected 6.4 – ≤ *
References
References4
- https://git.kernel.org/stable/c/f0a06203f2fe63f04311467200c99c4ee1926578 (opens in a new tab)
- https://git.kernel.org/stable/c/6738841f6fcf23e9fc30e2449f32fc84ee19c6f1 (opens in a new tab)
- https://git.kernel.org/stable/c/5b8e5e28e85a546dfccc3895befe0e823fdd7c89 (opens in a new tab)
- https://git.kernel.org/stable/c/47e8b73bc35d7c54642f78e498697692f6358996 (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)
- EUVD EUVD-2025-32809 (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)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-53458)Record last updated .