CVE-2022-49889 (GCVE-0-2022-49889)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2025-10-01 16:10
VLAI?
Title
ring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters()
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters() On some machines the number of listed CPUs may be bigger than the actual CPUs that exist. The tracing subsystem allocates a per_cpu directory with access to the per CPU ring buffer via a cpuX file. But to save space, the ring buffer will only allocate buffers for online CPUs, even though the CPU array will be as big as the nr_cpu_ids. With the addition of waking waiters on the ring buffer when closing the file, the ring_buffer_wake_waiters() now needs to make sure that the buffer is allocated (with the irq_work allocated with it) before trying to wake waiters, as it will cause a NULL pointer dereference. While debugging this, I added a NULL check for the buffer itself (which is OK to do), and also NULL pointer checks against buffer->buffers (which is not fine, and will WARN) as well as making sure the CPU number passed in is within the nr_cpu_ids (which is also not fine if it isn't). Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1204705
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2475de2bc0de17fb1b24c5e90194f84b5ca70d3e , < b5074df412bf3df9d6ce096b6fa03eb1082d05c9 (git)
Affected: f4f15344110d0b5b8822ac97bc8200e71939c945 , < 49ca992f6e50d0f46ec9608f44e011cf3121f389 (git)
Affected: f3ddb74ad0790030c9592229fb14d8c451f4e9a8 , < 7433632c9ff68a991bd0bc38cabf354e9d2de410 (git)
Affected: 5544f411a4e8bc39e6a444badbac37dd0e0caf0a (git)
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    Linux Linux Affected: 5.15.75 , < 5.15.78 (semver)
Affected: 6.0.3 , < 6.0.8 (semver)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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