CVE - CVE-2023-52447

CVE-ID
CVE-2023-52447	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Defer the free of inner map when necessary When updating or deleting an inner map in map array or map htab, the map may still be accessed by non-sleepable program or sleepable program. However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map directly through bpf_map_put(), if the ref-counter is the last one (which is true for most cases), the inner map will be freed by ops->map_free() in a kworker. But for now, most .map_free() callbacks don't use synchronize_rcu() or its variants to wait for the elapse of a RCU grace period, so after the invocation of ops->map_free completes, the bpf program which is accessing the inner map may incur use-after-free problem. Fix the free of inner map by invoking bpf_map_free_deferred() after both one RCU grace period and one tasks trace RCU grace period if the inner map has been removed from the outer map before. The deferment is accomplished by using call_rcu() or call_rcu_tasks_trace() when releasing the last ref-counter of bpf map. The newly-added rcu_head field in bpf_map shares the same storage space with work field to reduce the size of bpf_map.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6 URL:https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6 MISC:https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0 URL:https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0 MISC:https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368 URL:https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368 MISC:https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2 URL:https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2 MISC:https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5 URL:https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5 MISC:https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee URL:https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee
Assigning CNA
kernel.org
Date Record Created
20240220	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240220)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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