In the Linux kernel, the following vulnerability has been resolved:
perf/x86/amd/uncore: Fix memory leak for events array
When a CPU comes online, the per-CPU NB and LLC uncore contexts are freed but not the events array within the context structure. This causes a memory leak as identified by the kmemleak detector.
[...] unreferenced object 0xffff8c5944b8e320 (size 32): comm "swapper/0", pid 1, jiffies 4294670387 (age 151.072s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000000759fb79>] amd_uncore_cpu_up_prepare+0xaf/0x230 [<00000000ddc9e126>] cpuhp_invoke_callback+0x2cf/0x470 [<0000000093e727d4>] cpuhp_issue_call+0x14d/0x170 [<0000000045464d54>] __cpuhp_setup_state_cpuslocked+0x11e/0x330 [<0000000069f67cbd>] __cpuhp_setup_state+0x6b/0x110 [<0000000015365e0f>] amd_uncore_init+0x260/0x321 [<00000000089152d2>] do_one_initcall+0x3f/0x1f0 [<000000002d0bd18d>] kernel_init_freeable+0x1ca/0x212 [<0000000030be8dde>] kernel_init+0x11/0x120 [<0000000059709e59>] ret_from_fork+0x22/0x30 unreferenced object 0xffff8c5944b8dd40 (size 64): comm "swapper/0", pid 1, jiffies 4294670387 (age 151.072s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000306efe8b>] amd_uncore_cpu_up_prepare+0x183/0x230 [<00000000ddc9e126>] cpuhp_invoke_callback+0x2cf/0x470 [<0000000093e727d4>] cpuhp_issue_call+0x14d/0x170 [<0000000045464d54>] __cpuhp_setup_state_cpuslocked+0x11e/0x330 [<0000000069f67cbd>] __cpuhp_setup_state+0x6b/0x110 [<0000000015365e0f>] amd_uncore_init+0x260/0x321 [<00000000089152d2>] do_one_initcall+0x3f/0x1f0 [<000000002d0bd18d>] kernel_init_freeable+0x1ca/0x212 [<0000000030be8dde>] kernel_init+0x11/0x120 [<0000000059709e59>] ret_from_fork+0x22/0x30 [...]
Fix the problem by freeing the events array before freeing the uncore context.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | May 5, 2025 | May 1, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Sep 25, 2025 | Sep 15, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 1, 2025 |
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