CVE - CVE-2025-38008

CVE-ID
CVE-2025-38008	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: mm/page_alloc: fix race condition in unaccepted memory handling The page allocator tracks the number of zones that have unaccepted memory using static_branch_enc/dec() and uses that static branch in hot paths to determine if it needs to deal with unaccepted memory. Borislav and Thomas pointed out that the tracking is racy: operations on static_branch are not serialized against adding/removing unaccepted pages to/from the zone. Sanity checks inside static_branch machinery detects it: WARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 The comment around the WARN() explains the problem: /* * Warn about the '-1' case though; since that means a * decrement is concurrent with a first (0->1) increment. IOW * people are trying to disable something that wasn't yet fully * enabled. This suggests an ordering problem on the user side. */ The effect of this static_branch optimization is only visible on microbenchmark. Instead of adding more complexity around it, remove it altogether.
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/71dda1cb10702dc2859f00eb789b0502de2176a9 URL:https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9 MISC:https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53 URL:https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53 MISC:https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d URL:https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d MISC:https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73 URL:https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73
Assigning CNA
kernel.org
Date Record Created
20250416	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 (20250416)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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