In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Prevent subbuf order change when resizing is disabled Because… (CVE-2026-74634)
A vulnerability in the Linux kernel's ring-buffer subsystem could lead to a use-after-free condition when resizing is disabled. The issue arises because the function ring_buffer_subbuf_order_set() frees buffer pages, which is unsafe if resizing is disabled. This affects non-consuming readers that may access freed memory. The fix involves returning an error (-EBUSY) when resizing is disabled to prevent this unsafe operation.
AI Analysis
Technical Summary
The Linux kernel had a vulnerability in its ring-buffer implementation where the function ring_buffer_subbuf_order_set() could free buffer pages even when resizing was disabled. This could cause a use-after-free condition in non-consuming readers via rb_advance_iter(). The patch prevents this by returning -EBUSY when resizing is disabled, aligning with the behavior of ring_buffer_resize().
Potential Impact
The vulnerability could lead to use-after-free memory access in the kernel, potentially causing system instability or crashes. There is no indication of known exploits in the wild. The impact is limited to kernel memory safety and could affect system reliability or security if exploited.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to prevent this vulnerability by returning an error when resizing is disabled. Users should update to the patched kernel versions once available. Patch status is not explicitly confirmed in the provided data; check the official Linux kernel advisories for the exact fixed versions and apply updates accordingly.
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Prevent subbuf order change when resizing is disabled Because… (CVE-2026-74634)
Description
A vulnerability in the Linux kernel's ring-buffer subsystem could lead to a use-after-free condition when resizing is disabled. The issue arises because the function ring_buffer_subbuf_order_set() frees buffer pages, which is unsafe if resizing is disabled. This affects non-consuming readers that may access freed memory. The fix involves returning an error (-EBUSY) when resizing is disabled to prevent this unsafe operation.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel had a vulnerability in its ring-buffer implementation where the function ring_buffer_subbuf_order_set() could free buffer pages even when resizing was disabled. This could cause a use-after-free condition in non-consuming readers via rb_advance_iter(). The patch prevents this by returning -EBUSY when resizing is disabled, aligning with the behavior of ring_buffer_resize().
Potential Impact
The vulnerability could lead to use-after-free memory access in the kernel, potentially causing system instability or crashes. There is no indication of known exploits in the wild. The impact is limited to kernel memory safety and could affect system reliability or security if exploited.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to prevent this vulnerability by returning an error when resizing is disabled. Users should update to the patched kernel versions once available. Patch status is not explicitly confirmed in the provided data; check the official Linux kernel advisories for the exact fixed versions and apply updates accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-cq5j-7xcv-jwf8
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-74634"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a8a27f2acd9273b499bc830
Added to database: 08/22/2026, 22:51:30 UTC
Last enriched: 08/22/2026, 23:40:08 UTC
Last updated: 08/23/2026, 00:12:15 UTC
Views: 2
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