CVE - CVE-2023-52476

CVE-ID
CVE-2023-52476	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: perf/x86/lbr: Filter vsyscall addresses We found that a panic can occur when a vsyscall is made while LBR sampling is active. If the vsyscall is interrupted (NMI) for perf sampling, this call sequence can occur (most recent at top): __insn_get_emulate_prefix() insn_get_emulate_prefix() insn_get_prefixes() insn_get_opcode() decode_branch_type() get_branch_type() intel_pmu_lbr_filter() intel_pmu_handle_irq() perf_event_nmi_handler() Within __insn_get_emulate_prefix() at frame 0, a macro is called: peek_nbyte_next(insn_byte_t, insn, i) Within this macro, this dereference occurs: (insn)->next_byte Inspecting registers at this point, the value of the next_byte field is the address of the vsyscall made, for example the location of the vsyscall version of gettimeofday() at 0xffffffffff600000. The access to an address in the vsyscall region will trigger an oops due to an unhandled page fault. To fix the bug, filtering for vsyscalls can be done when determining the branch type. This patch will return a "none" branch if a kernel address if found to lie in the vsyscall region.
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/3863989497652488a50f00e96de4331e5efabc6c URL:https://git.kernel.org/stable/c/3863989497652488a50f00e96de4331e5efabc6c MISC:https://git.kernel.org/stable/c/403d201d1fd144cb249836dafb222f6375871c6c URL:https://git.kernel.org/stable/c/403d201d1fd144cb249836dafb222f6375871c6c MISC:https://git.kernel.org/stable/c/e53899771a02f798d436655efbd9d4b46c0f9265 URL:https://git.kernel.org/stable/c/e53899771a02f798d436655efbd9d4b46c0f9265 MISC:https://git.kernel.org/stable/c/f71edacbd4f99c0e12fe4a4007ab4d687d0688db URL:https://git.kernel.org/stable/c/f71edacbd4f99c0e12fe4a4007ab4d687d0688db
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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