CVE-2026-31583
CVE-2026-31583 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-25476
- Weakness: CWE-416
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
Description
In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free in em28xx_v4l2_open() em28xx_v4l2_open() reads dev->v4l2 without holding dev->lock, creating a race with em28xx_v4l2_init()'s error path and em28xx_v4l2_fini(), both of which free the em28xx_v4l2 struct and set dev->v4l2 to NULL under dev->lock. This race leads to two issues: - use-after-free in v4l2_fh_init() when accessing vdev->ctrl_handler, since the video_device is embedded in the freed em28xx_v4l2 struct. - NULL pointer dereference in em28xx_resolution_set() when accessing v4l2->norm, since dev->v4l2 has been set to NULL. Fix this by moving the mutex_lock() before the dev->v4l2 read and adding a NULL check for dev->v4l2 under the lock.
Frequently asked questions
- What is CVE-2026-31583?
- In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free in em28xx_v4l2_open() em28xx_v4l2_open() reads dev->v4l2 without holding dev->lock, creating a race with em28xx_v4l2_init()'s error path and em28xx_v4l2_fini(), both of which free the em28xx_v4l2 struct and set dev->v4l2 to NULL under dev->lock. This race leads to two issues: - use-after-free in v4l2_fh_init() when accessing vdev->ctrl_handler, since the video_device is embedded in the freed em28xx_v4l2 struct. - NULL pointer dereference in em28xx_resolution_set() when accessing v4l2->norm, since dev->v4l2 has been set to NULL. Fix this by moving the mutex_lock() before the dev->v4l2 read and adding a NULL check for dev->v4l2 under the lock.
- How severe is CVE-2026-31583?
- CVE-2026-31583 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-31583 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-31583?
- CVE-2026-31583 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-31583?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-31583 have an EU (EUVD) identifier?
- Yes. CVE-2026-31583 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25476.
- When was CVE-2026-31583 published?
- CVE-2026-31583 was published on 2026-04-24 and last updated on 2026-06-17.
References
- https://git.kernel.org/stable/c/2cbf81f76842e46bdf25823c70e1db4044a65678
- https://git.kernel.org/stable/c/38a327221f7f765e7d853b7bafe47e342441ec85
- https://git.kernel.org/stable/c/3c0283a59e36e3707c4a81f4952e362d31f876b8
- https://git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324
- https://git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972
- https://git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd
- https://git.kernel.org/stable/c/a66485a934c7187ae8e36517d40615fa2e961cff
- https://git.kernel.org/stable/c/b5d141ea15f173f15b9f0a72965902f3428c0d92
- https://git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f
Affected products (1)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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