CVE-2024-56613 (GCVE-0-2024-56613)
Vulnerability from cvelistv5
Published
2024-12-27 14:51
Modified
2026-05-11 20:55
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/numa: fix memory leak due to the overwritten vma->numab_state [Problem Description] When running the hackbench program of LTP, the following memory leak is reported by kmemleak. # /opt/ltp/testcases/bin/hackbench 20 thread 1000 Running with 20*40 (== 800) tasks. # dmesg | grep kmemleak ... kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak) kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak) # cat /sys/kernel/debug/kmemleak unreferenced object 0xffff888cd8ca2c40 (size 64): comm "hackbench", pid 17142, jiffies 4299780315 hex dump (first 32 bytes): ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00 .tI.....L.I..... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc bff18fd4): [<ffffffff81419a89>] __kmalloc_cache_noprof+0x2f9/0x3f0 [<ffffffff8113f715>] task_numa_work+0x725/0xa00 [<ffffffff8110f878>] task_work_run+0x58/0x90 [<ffffffff81ddd9f8>] syscall_exit_to_user_mode+0x1c8/0x1e0 [<ffffffff81dd78d5>] do_syscall_64+0x85/0x150 [<ffffffff81e0012b>] entry_SYSCALL_64_after_hwframe+0x76/0x7e ... This issue can be consistently reproduced on three different servers: * a 448-core server * a 256-core server * a 192-core server [Root Cause] Since multiple threads are created by the hackbench program (along with the command argument 'thread'), a shared vma might be accessed by two or more cores simultaneously. When two or more cores observe that vma->numab_state is NULL at the same time, vma->numab_state will be overwritten. Although current code ensures that only one thread scans the VMAs in a single 'numa_scan_period', there might be a chance for another thread to enter in the next 'numa_scan_period' while we have not gotten till numab_state allocation [1]. Note that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000` cannot the reproduce the issue. It is verified with 200+ test runs. [Solution] Use the cmpxchg atomic operation to ensure that only one thread executes the vma->numab_state assignment. [1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/
References
Impacted products
Vendor Product Version
Linux Linux Version: ef6a22b70f6d90449a5c797b8968a682824e2011
Version: ef6a22b70f6d90449a5c797b8968a682824e2011
Version: ef6a22b70f6d90449a5c797b8968a682824e2011
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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: fix memory leak due to the overwritten vma-\u003enumab_state\n\n[Problem Description]\nWhen running the hackbench program of LTP, the following memory leak is\nreported by kmemleak.\n\n  # /opt/ltp/testcases/bin/hackbench 20 thread 1000\n  Running with 20*40 (== 800) tasks.\n\n  # dmesg | grep kmemleak\n  ...\n  kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n  kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n\n  # cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff888cd8ca2c40 (size 64):\n    comm \"hackbench\", pid 17142, jiffies 4299780315\n    hex dump (first 32 bytes):\n      ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00  .tI.....L.I.....\n      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    backtrace (crc bff18fd4):\n      [\u003cffffffff81419a89\u003e] __kmalloc_cache_noprof+0x2f9/0x3f0\n      [\u003cffffffff8113f715\u003e] task_numa_work+0x725/0xa00\n      [\u003cffffffff8110f878\u003e] task_work_run+0x58/0x90\n      [\u003cffffffff81ddd9f8\u003e] syscall_exit_to_user_mode+0x1c8/0x1e0\n      [\u003cffffffff81dd78d5\u003e] do_syscall_64+0x85/0x150\n      [\u003cffffffff81e0012b\u003e] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ...\n\nThis issue can be consistently reproduced on three different servers:\n  * a 448-core server\n  * a 256-core server\n  * a 192-core server\n\n[Root Cause]\nSince multiple threads are created by the hackbench program (along with\nthe command argument \u0027thread\u0027), a shared vma might be accessed by two or\nmore cores simultaneously. When two or more cores observe that\nvma-\u003enumab_state is NULL at the same time, vma-\u003enumab_state will be\noverwritten.\n\nAlthough current code ensures that only one thread scans the VMAs in a\nsingle \u0027numa_scan_period\u0027, there might be a chance for another thread\nto enter in the next \u0027numa_scan_period\u0027 while we have not gotten till\nnumab_state allocation [1].\n\nNote that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000`\ncannot the reproduce the issue. It is verified with 200+ test runs.\n\n[Solution]\nUse the cmpxchg atomic operation to ensure that only one thread executes\nthe vma-\u003enumab_state assignment.\n\n[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/"
        }
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    "cveId": "CVE-2024-56613",
    "datePublished": "2024-12-27T14:51:18.068Z",
    "dateReserved": "2024-12-27T14:03:06.014Z",
    "dateUpdated": "2026-05-11T20:55:51.104Z",
    "state": "PUBLISHED"
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}


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