CVE - CVE-2022-50219

CVE-ID
CVE-2022-50219	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: Fix KASAN use-after-free Read in compute_effective_progs Syzbot found a Use After Free bug in compute_effective_progs(). The reproducer creates a number of BPF links, and causes a fault injected alloc to fail, while calling bpf_link_detach on them. Link detach triggers the link to be freed by bpf_link_free(), which calls __cgroup_bpf_detach() and update_effective_progs(). If the memory allocation in this function fails, the function restores the pointer to the bpf_cgroup_link on the cgroup list, but the memory gets freed just after it returns. After this, every subsequent call to update_effective_progs() causes this already deallocated pointer to be dereferenced in prog_list_length(), and triggers KASAN UAF error. To fix this issue don't preserve the pointer to the prog or link in the list, but remove it and replace it with a dummy prog without shrinking the table. The subsequent call to __cgroup_bpf_detach() or __cgroup_bpf_detach() will correct it.
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/1f8ca9c40e6222ce431e9ba5dae3cccce8ef9443 URL:https://git.kernel.org/stable/c/1f8ca9c40e6222ce431e9ba5dae3cccce8ef9443 MISC:https://git.kernel.org/stable/c/3527e3cbb84d8868c4d4e91ba55915f96d39ec3d URL:https://git.kernel.org/stable/c/3527e3cbb84d8868c4d4e91ba55915f96d39ec3d MISC:https://git.kernel.org/stable/c/4c46091ee985ae84c60c5e95055d779fcd291d87 URL:https://git.kernel.org/stable/c/4c46091ee985ae84c60c5e95055d779fcd291d87 MISC:https://git.kernel.org/stable/c/6336388715afa419cc97d0255bda3bba1b96b7ca URL:https://git.kernel.org/stable/c/6336388715afa419cc97d0255bda3bba1b96b7ca MISC:https://git.kernel.org/stable/c/be001f9da71eaa3b61e186fb88bde3279728bdca URL:https://git.kernel.org/stable/c/be001f9da71eaa3b61e186fb88bde3279728bdca
Assigning CNA
kernel.org
Date Record Created
20250618	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 (20250618)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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