vulnerability
Ubuntu: (Multiple Advisories) (CVE-2025-37966): Linux kernel vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | May 20, 2025 | Jun 26, 2025 | Jan 28, 2026 |
Description
In the Linux kernel, the following vulnerability has been resolved:
riscv: Fix kernel crash due to PR_SET_TAGGED_ADDR_CTRL
When userspace does PR_SET_TAGGED_ADDR_CTRL, but Supm extension is not
available, the kernel crashes:
Oops - illegal instruction [#1]
[snip]
epc : set_tagged_addr_ctrl+0x112/0x15a
ra : set_tagged_addr_ctrl+0x74/0x15a
epc : ffffffff80011ace ra : ffffffff80011a30 sp : ffffffc60039be10
[snip]
status: 0000000200000120 badaddr: 0000000010a79073 cause: 0000000000000002
set_tagged_addr_ctrl+0x112/0x15a
__riscv_sys_prctl+0x352/0x73c
do_trap_ecall_u+0x17c/0x20c
andle_exception+0x150/0x15c
Fix it by checking if Supm is available.
Solutions
References
- CVE-2025-37966
- https://attackerkb.com/topics/CVE-2025-37966
- CWE-668
- UBUNTU-USN-7699-1
- UBUNTU-USN-7699-2
- UBUNTU-USN-7721-1
- URL-https://git.kernel.org/linus/ae08d55807c099357c047dba17624b09414635dd
- URL-https://git.kernel.org/stable/c/4b595a2f5656cd45d534ed2160c94f7662adefe5
- URL-https://git.kernel.org/stable/c/ae08d55807c099357c047dba17624b09414635dd
- URL-https://ubuntu.com/security/notices/USN-7699-1
- URL-https://www.cve.org/CVERecord?id=CVE-2025-37966
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