Security readout for executives and security teams
Plain-English summary
CVE-2023-53219 is a Linux kernel use-after-free bug in the netup_unidvb media driver used with Universal DVB cards. It is high severity because successful local exploitation could affect confidentiality, integrity, and availability. The provided sources do not show active exploitation or KEV listing.
Executive priority
Treat as a high-priority kernel maintenance item where affected hardware or modules exist, especially on shared Linux systems. For fleets without the driver or hardware, urgency is lower but inventory confirmation is still needed.
Technical view
During Universal DVB card detach, netup_unidvb_dma_fini() used del_timer() on dma->timeout. If netup_unidvb_dma_timeout() was already running, the timer handler could continue and reference freed device state. The kernel fix changes this to del_timer_sync(), preventing concurrent timer-handler use after cleanup.
Likely exposure
Exposure appears limited to Linux systems running affected kernels with the netup_unidvb driver and relevant Universal DVB hardware or module use. The CVSS vector is local, low complexity, low privileges, and no user interaction, so this is not described as a remote-network issue in the sources.
Exploitation context
No provided source states active exploitation, and the bundle marks KEV as false. The vulnerability is a kernel memory safety flaw with local attack requirements. Practical exploitability depends on local access, driver availability, hardware/module state, and kernel hardening.
Researcher notes
The root issue is timer teardown synchronization in netup_unidvb DMA cleanup. The source bundle provides fix commits but not exploit reports, proof-of-concept details, or distribution-specific fixed package versions. Avoid assuming exposure without confirming the driver and kernel lineage.
Mitigation direction
- Update to a Linux kernel containing the stable netup_unidvb fix.
- Prioritize distro-provided kernel security updates over manual patching.
- If unable to patch, check vendor guidance for supported driver disablement.
- Inventory systems using Universal DVB cards or the netup_unidvb module.
- Schedule remediation faster on shared or multi-user Linux hosts.
Validation and detection
- Confirm running kernel versions against vendor advisories for CVE-2023-53219.
- Check whether netup_unidvb is present, loaded, or packaged.
- Identify hosts with Universal DVB card usage or media-driver exposure.
- Verify the installed kernel includes the del_timer_sync() fix.
- Document exceptions where vendor fixes are unavailable or unconfirmed.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit dd5c77814f290b353917df329f36de1472d47154
- Linux stable commit 90229e9ee957d4514425e4a4d82c50ab5d57ac4d
- Linux stable commit 1550bcf2983ae1220cc8ab899a39a423fa7cb523
- Linux stable commit f9982db735a8495eee14267cf193c806b957e942
- Linux stable commit 051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3
- Linux stable commit 07821524f67bf920342bc84ae8b3dea2a315a89e
- Linux stable commit c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fc
- Linux stable commit 0f5bb36bf9b39a2a96e730bf4455095b50713f63
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-416: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-53219 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/dd5c77814f290b353917df329f36de1472d47154CVE reference, Linux
- https://git.kernel.org/stable/c/90229e9ee957d4514425e4a4d82c50ab5d57ac4dCVE reference, Linux
- https://git.kernel.org/stable/c/1550bcf2983ae1220cc8ab899a39a423fa7cb523CVE reference, Linux
- https://git.kernel.org/stable/c/f9982db735a8495eee14267cf193c806b957e942CVE reference, Linux
- https://git.kernel.org/stable/c/051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3CVE reference, Linux
- https://git.kernel.org/stable/c/07821524f67bf920342bc84ae8b3dea2a315a89eCVE reference, Linux
- https://git.kernel.org/stable/c/c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fcCVE reference, Linux
- https://git.kernel.org/stable/c/0f5bb36bf9b39a2a96e730bf4455095b50713f63CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.