CVE-2022-50093 (GCVE-0-2022-50093)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:02 – Updated: 2025-06-18 11:02
VLAI?
Title
iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE) KASAN reports: [ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) [ 4.676149][ T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0 [ 4.683454][ T0] [ 4.685638][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1 [ 4.694331][ T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016 [ 4.703196][ T0] Call Trace: [ 4.706334][ T0] <TASK> [ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) after converting the type of the first argument (@nr, bit number) of arch_test_bit() from `long` to `unsigned long`[0]. Under certain conditions (for example, when ACPI NUMA is disabled via command line), pxm_to_node() can return %NUMA_NO_NODE (-1). It is valid 'magic' number of NUMA node, but not valid bit number to use in bitops. node_online() eventually descends to test_bit() without checking for the input, assuming it's on caller side (which might be good for perf-critical tasks). There, -1 becomes %ULONG_MAX which leads to an insane array index when calculating bit position in memory. For now, add an explicit check for @node being not %NUMA_NO_NODE before calling test_bit(). The actual logics didn't change here at all. [0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < b12304984654d8e58a2b22ff94c4410906d6267f (git)
Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < 5659efdadf04b56707d58c1b758df16d2e0eff2c (git)
Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < 0b4c0003aeda32a600f95df53b2848da8a5aa3fa (git)
Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < 73ce2046e04ad488cecc66757c36cbe1bdf089d4 (git)
Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa (git)
Affected: ee34b32d8c2950f66038c8975747ef9aec855289 , < b0b0b77ea611e3088e9523e60860f4f41b62b235 (git)
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    Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 5.4.211 , ≤ 5.4.* (semver)
Unaffected: 5.10.137 , ≤ 5.10.* (semver)
Unaffected: 5.15.61 , ≤ 5.15.* (semver)
Unaffected: 5.18.18 , ≤ 5.18.* (semver)
Unaffected: 5.19.2 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)\n\nKASAN reports:\n\n[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n[    4.676149][    T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0\n[    4.683454][    T0]\n[    4.685638][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1\n[    4.694331][    T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016\n[    4.703196][    T0] Call Trace:\n[    4.706334][    T0]  \u003cTASK\u003e\n[ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n\nafter converting the type of the first argument (@nr, bit number)\nof arch_test_bit() from `long` to `unsigned long`[0].\n\nUnder certain conditions (for example, when ACPI NUMA is disabled\nvia command line), pxm_to_node() can return %NUMA_NO_NODE (-1).\nIt is valid \u0027magic\u0027 number of NUMA node, but not valid bit number\nto use in bitops.\nnode_online() eventually descends to test_bit() without checking\nfor the input, assuming it\u0027s on caller side (which might be good\nfor perf-critical tasks). There, -1 becomes %ULONG_MAX which leads\nto an insane array index when calculating bit position in memory.\n\nFor now, add an explicit check for @node being not %NUMA_NO_NODE\nbefore calling test_bit(). The actual logics didn\u0027t change here\nat all.\n\n[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:31.966Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b12304984654d8e58a2b22ff94c4410906d6267f"
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          "url": "https://git.kernel.org/stable/c/5659efdadf04b56707d58c1b758df16d2e0eff2c"
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          "url": "https://git.kernel.org/stable/c/c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0b0b77ea611e3088e9523e60860f4f41b62b235"
        }
      ],
      "title": "iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50093",
    "datePublished": "2025-06-18T11:02:31.966Z",
    "dateReserved": "2025-06-18T10:57:27.411Z",
    "dateUpdated": "2025-06-18T11:02:31.966Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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