Bug 2367575 (CVE-2025-37966) - CVE-2025-37966 kernel: riscv: Fix kernel crash due to PR_SET_TAGGED_ADDR_CTRL
Summary: CVE-2025-37966 kernel: riscv: Fix kernel crash due to PR_SET_TAGGED_ADDR_CTRL
Keywords:
Status: NEW
Alias: CVE-2025-37966
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-05-20 17:01 UTC by OSIDB Bzimport
Modified: 2025-05-21 02:40 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2025-05-20 17:01:37 UTC 
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.
Comment 1 Jon Moroney 2025-05-21 02:33:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052045-CVE-2025-37966-8d4c@gregkh/T
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