CVE - CVE-2025-22048

CVE-ID
CVE-2025-22048	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: LoongArch: BPF: Don't override subprog's return value The verifier test `calls: div by 0 in subprog` triggers a panic at the ld.bu instruction. The ld.bu insn is trying to load byte from memory address returned by the subprog. The subprog actually set the correct address at the a5 register (dedicated register for BPF return values). But at commit 73c359d1d356 ("LoongArch: BPF: Sign-extend return values") we also sign extended a5 to the a0 register (return value in LoongArch). For function call insn, we later propagate the a0 register back to a5 register. This is right for native calls but wrong for bpf2bpf calls which expect zero-extended return value in a5 register. So only move a0 to a5 for native calls (i.e. non-BPF_PSEUDO_CALL).
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/223d565d8892481684091cfbaf3466f2b0e289d3 URL:https://git.kernel.org/stable/c/223d565d8892481684091cfbaf3466f2b0e289d3 MISC:https://git.kernel.org/stable/c/60f3caff1492e5b8616b9578c4bedb5c0a88ed14 URL:https://git.kernel.org/stable/c/60f3caff1492e5b8616b9578c4bedb5c0a88ed14 MISC:https://git.kernel.org/stable/c/780628a780b622759d9e5adc76d15432144da1a3 URL:https://git.kernel.org/stable/c/780628a780b622759d9e5adc76d15432144da1a3 MISC:https://git.kernel.org/stable/c/7df2696256a034405d3c5a71b3a4c54725de4404 URL:https://git.kernel.org/stable/c/7df2696256a034405d3c5a71b3a4c54725de4404 MISC:https://git.kernel.org/stable/c/996e90ab446641553e8e21707b38b9709605e0e0 URL:https://git.kernel.org/stable/c/996e90ab446641553e8e21707b38b9709605e0e0
Assigning CNA
kernel.org
Date Record Created
20241229	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 (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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