CVE-2024-26983 (GCVE-0-2024-26983)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:27 – Updated: 2026-05-11 20:08
VLAI
Title
bootconfig: use memblock_free_late to free xbc memory to buddy
Summary
In the Linux kernel, the following vulnerability has been resolved: bootconfig: use memblock_free_late to free xbc memory to buddy On the time to free xbc memory in xbc_exit(), memblock may has handed over memory to buddy allocator. So it doesn't make sense to free memory back to memblock. memblock_free() called by xbc_exit() even causes UAF bugs on architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86. Following KASAN logs shows this case. This patch fixes the xbc memory free problem by calling memblock_free() in early xbc init error rewind path and calling memblock_free_late() in xbc exit path to free memory to buddy allocator. [ 9.410890] ================================================================== [ 9.418962] BUG: KASAN: use-after-free in memblock_isolate_range+0x12d/0x260 [ 9.426850] Read of size 8 at addr ffff88845dd30000 by task swapper/0/1 [ 9.435901] CPU: 9 PID: 1 Comm: swapper/0 Tainted: G U 6.9.0-rc3-00208-g586b5dfb51b9 #5 [ 9.446403] Hardware name: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 Dec 28 2023 [ 9.460789] Call Trace: [ 9.463518] <TASK> [ 9.465859] dump_stack_lvl+0x53/0x70 [ 9.469949] print_report+0xce/0x610 [ 9.473944] ? __virt_addr_valid+0xf5/0x1b0 [ 9.478619] ? memblock_isolate_range+0x12d/0x260 [ 9.483877] kasan_report+0xc6/0x100 [ 9.487870] ? memblock_isolate_range+0x12d/0x260 [ 9.493125] memblock_isolate_range+0x12d/0x260 [ 9.498187] memblock_phys_free+0xb4/0x160 [ 9.502762] ? __pfx_memblock_phys_free+0x10/0x10 [ 9.508021] ? mutex_unlock+0x7e/0xd0 [ 9.512111] ? __pfx_mutex_unlock+0x10/0x10 [ 9.516786] ? kernel_init_freeable+0x2d4/0x430 [ 9.521850] ? __pfx_kernel_init+0x10/0x10 [ 9.526426] xbc_exit+0x17/0x70 [ 9.529935] kernel_init+0x38/0x1e0 [ 9.533829] ? _raw_spin_unlock_irq+0xd/0x30 [ 9.538601] ret_from_fork+0x2c/0x50 [ 9.542596] ? __pfx_kernel_init+0x10/0x10 [ 9.547170] ret_from_fork_asm+0x1a/0x30 [ 9.551552] </TASK> [ 9.555649] The buggy address belongs to the physical page: [ 9.561875] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x45dd30 [ 9.570821] flags: 0x200000000000000(node=0|zone=2) [ 9.576271] page_type: 0xffffffff() [ 9.580167] raw: 0200000000000000 ffffea0011774c48 ffffea0012ba1848 0000000000000000 [ 9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 [ 9.597476] page dumped because: kasan: bad access detected [ 9.605362] Memory state around the buggy address: [ 9.610714] ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.618786] ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.626857] >ffff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.634930] ^ [ 9.638534] ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.646605] ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.654675] ==================================================================
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 40caa127f3c7279c75cb0c9684559fa314ee3a66 , < 1e7feb31a18c197d63a5e606025ed63c762f8918 (git)
Affected: 40caa127f3c7279c75cb0c9684559fa314ee3a66 , < e46d3be714ad9652480c6db129ab8125e2d20ab7 (git)
Affected: 40caa127f3c7279c75cb0c9684559fa314ee3a66 , < 5a7dfb8fcd3f29fc93161100179b27f24f3d5f35 (git)
Affected: 40caa127f3c7279c75cb0c9684559fa314ee3a66 , < 89f9a1e876b5a7ad884918c03a46831af202c8a0 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbootconfig: use memblock_free_late to free xbc memory to buddy\n\nOn the time to free xbc memory in xbc_exit(), memblock may has handed\nover memory to buddy allocator. So it doesn\u0027t make sense to free memory\nback to memblock. memblock_free() called by xbc_exit() even causes UAF bugs\non architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86.\nFollowing KASAN logs shows this case.\n\nThis patch fixes the xbc memory free problem by calling memblock_free()\nin early xbc init error rewind path and calling memblock_free_late() in\nxbc exit path to free memory to buddy allocator.\n\n[    9.410890] ==================================================================\n[    9.418962] BUG: KASAN: use-after-free in memblock_isolate_range+0x12d/0x260\n[    9.426850] Read of size 8 at addr ffff88845dd30000 by task swapper/0/1\n\n[    9.435901] CPU: 9 PID: 1 Comm: swapper/0 Tainted: G     U             6.9.0-rc3-00208-g586b5dfb51b9 #5\n[    9.446403] Hardware name: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 Dec 28 2023\n[    9.460789] Call Trace:\n[    9.463518]  \u003cTASK\u003e\n[    9.465859]  dump_stack_lvl+0x53/0x70\n[    9.469949]  print_report+0xce/0x610\n[    9.473944]  ? __virt_addr_valid+0xf5/0x1b0\n[    9.478619]  ? memblock_isolate_range+0x12d/0x260\n[    9.483877]  kasan_report+0xc6/0x100\n[    9.487870]  ? memblock_isolate_range+0x12d/0x260\n[    9.493125]  memblock_isolate_range+0x12d/0x260\n[    9.498187]  memblock_phys_free+0xb4/0x160\n[    9.502762]  ? __pfx_memblock_phys_free+0x10/0x10\n[    9.508021]  ? mutex_unlock+0x7e/0xd0\n[    9.512111]  ? __pfx_mutex_unlock+0x10/0x10\n[    9.516786]  ? kernel_init_freeable+0x2d4/0x430\n[    9.521850]  ? __pfx_kernel_init+0x10/0x10\n[    9.526426]  xbc_exit+0x17/0x70\n[    9.529935]  kernel_init+0x38/0x1e0\n[    9.533829]  ? _raw_spin_unlock_irq+0xd/0x30\n[    9.538601]  ret_from_fork+0x2c/0x50\n[    9.542596]  ? __pfx_kernel_init+0x10/0x10\n[    9.547170]  ret_from_fork_asm+0x1a/0x30\n[    9.551552]  \u003c/TASK\u003e\n\n[    9.555649] The buggy address belongs to the physical page:\n[    9.561875] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x45dd30\n[    9.570821] flags: 0x200000000000000(node=0|zone=2)\n[    9.576271] page_type: 0xffffffff()\n[    9.580167] raw: 0200000000000000 ffffea0011774c48 ffffea0012ba1848 0000000000000000\n[    9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\n[    9.597476] page dumped because: kasan: bad access detected\n\n[    9.605362] Memory state around the buggy address:\n[    9.610714]  ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[    9.618786]  ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[    9.626857] \u003effff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[    9.634930]                    ^\n[    9.638534]  ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[    9.646605]  ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[    9.654675] =================================================================="
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        "dateUpdated": "2026-05-11T20:08:08.349Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1e7feb31a18c197d63a5e606025ed63c762f8918"
        },
        {
          "url": "https://git.kernel.org/stable/c/e46d3be714ad9652480c6db129ab8125e2d20ab7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a7dfb8fcd3f29fc93161100179b27f24f3d5f35"
        },
        {
          "url": "https://git.kernel.org/stable/c/89f9a1e876b5a7ad884918c03a46831af202c8a0"
        }
      ],
      "title": "bootconfig: use memblock_free_late to free xbc memory to buddy",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26983",
    "datePublished": "2024-05-01T05:27:15.635Z",
    "dateReserved": "2024-02-19T14:20:24.204Z",
    "dateUpdated": "2026-05-11T20:08:08.349Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-26983",
      "date": "2026-07-24",
      "epss": "0.0023",
      "percentile": "0.13953"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T14:56:13.000Z",
      "cve": "CVE-2024-26983",
      "id": "msrc_CVE-2024-26983",
      "initial_release_date": "2024-05-02T07:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bootconfig: use memblock_free_late to free xbc memory to buddy",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-26983.json",
      "version": "15"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26983\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-01T06:15:15.747\",\"lastModified\":\"2026-06-17T07:18:51.477\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbootconfig: use memblock_free_late to free xbc memory to buddy\\n\\nOn the time to free xbc memory in xbc_exit(), memblock may has handed\\nover memory to buddy allocator. So it doesn\u0027t make sense to free memory\\nback to memblock. memblock_free() called by xbc_exit() even causes UAF bugs\\non architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86.\\nFollowing KASAN logs shows this case.\\n\\nThis patch fixes the xbc memory free problem by calling memblock_free()\\nin early xbc init error rewind path and calling memblock_free_late() in\\nxbc exit path to free memory to buddy allocator.\\n\\n[    9.410890] ==================================================================\\n[    9.418962] BUG: KASAN: use-after-free in memblock_isolate_range+0x12d/0x260\\n[    9.426850] Read of size 8 at addr ffff88845dd30000 by task swapper/0/1\\n\\n[    9.435901] CPU: 9 PID: 1 Comm: swapper/0 Tainted: G     U             6.9.0-rc3-00208-g586b5dfb51b9 #5\\n[    9.446403] Hardware name: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 Dec 28 2023\\n[    9.460789] Call Trace:\\n[    9.463518]  \u003cTASK\u003e\\n[    9.465859]  dump_stack_lvl+0x53/0x70\\n[    9.469949]  print_report+0xce/0x610\\n[    9.473944]  ? __virt_addr_valid+0xf5/0x1b0\\n[    9.478619]  ? memblock_isolate_range+0x12d/0x260\\n[    9.483877]  kasan_report+0xc6/0x100\\n[    9.487870]  ? memblock_isolate_range+0x12d/0x260\\n[    9.493125]  memblock_isolate_range+0x12d/0x260\\n[    9.498187]  memblock_phys_free+0xb4/0x160\\n[    9.502762]  ? __pfx_memblock_phys_free+0x10/0x10\\n[    9.508021]  ? mutex_unlock+0x7e/0xd0\\n[    9.512111]  ? __pfx_mutex_unlock+0x10/0x10\\n[    9.516786]  ? kernel_init_freeable+0x2d4/0x430\\n[    9.521850]  ? __pfx_kernel_init+0x10/0x10\\n[    9.526426]  xbc_exit+0x17/0x70\\n[    9.529935]  kernel_init+0x38/0x1e0\\n[    9.533829]  ? _raw_spin_unlock_irq+0xd/0x30\\n[    9.538601]  ret_from_fork+0x2c/0x50\\n[    9.542596]  ? __pfx_kernel_init+0x10/0x10\\n[    9.547170]  ret_from_fork_asm+0x1a/0x30\\n[    9.551552]  \u003c/TASK\u003e\\n\\n[    9.555649] The buggy address belongs to the physical page:\\n[    9.561875] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x45dd30\\n[    9.570821] flags: 0x200000000000000(node=0|zone=2)\\n[    9.576271] page_type: 0xffffffff()\\n[    9.580167] raw: 0200000000000000 ffffea0011774c48 ffffea0012ba1848 0000000000000000\\n[    9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\\n[    9.597476] page dumped because: kasan: bad access detected\\n\\n[    9.605362] Memory state around the buggy address:\\n[    9.610714]  ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[    9.618786]  ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[    9.626857] \u003effff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.634930]                    ^\\n[    9.638534]  ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.646605]  ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.654675] ==================================================================\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bootconfig: use memblock_free_late para liberar memoria xbc para el amigo En el momento de liberar memoria xbc en xbc_exit(), es posible que memblock haya entregado la memoria al asignador de amigos. Por lo tanto, no tiene sentido liberar memoria en Memblock. memblock_free() llamado por xbc_exit() incluso causa errores UAF en arquitecturas con CONFIG_ARCH_KEEP_MEMBLOCK deshabilitado como x86. Los siguientes registros de KASAN muestran este caso. Este parche soluciona el problema de falta de memoria de xbc llamando a memblock_free() en la ruta de rebobinado del error de inicio temprano de xbc y llamando a memblock_free_late() en la ruta de salida de xbc para liberar memoria al asignador de amigos. [9.410890] ================================================= =================== [9.418962] ERROR: KASAN: use-after-free en memblock_isolate_range+0x12d/0x260 [9.426850] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88845dd30000 por el intercambiador de tareas /0/1 [ 9.435901] CPU: 9 PID: 1 Comm: swapper/0 Contaminado: GU 6.9.0-rc3-00208-g586b5dfb51b9 #5 [ 9.446403] Nombre de hardware: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 28 de diciembre de 2023 [9.460789] Seguimiento de llamadas: [9.463518]  [9.465859] dump_stack_lvl+0x53/0x70 [9.469949] puerto+0xce/0x610 [ 9.473944] ? __virt_addr_valid+0xf5/0x1b0 [9.478619]? memblock_isolate_range+0x12d/0x260 [ 9.483877] kasan_report+0xc6/0x100 [ 9.487870] ? memblock_isolate_range+0x12d/0x260 [9.493125] memblock_isolate_range+0x12d/0x260 [9.498187] memblock_phys_free+0xb4/0x160 [9.502762]? __pfx_memblock_phys_free+0x10/0x10 [9.508021]? mutex_unlock+0x7e/0xd0 [9.512111]? __pfx_mutex_unlock+0x10/0x10 [9.516786]? kernel_init_freeable+0x2d4/0x430 [9.521850]? __pfx_kernel_init+0x10/0x10 [ 9.526426] xbc_exit+0x17/0x70 [ 9.529935] kernel_init+0x38/0x1e0 [ 9.533829] ? _raw_spin_unlock_irq+0xd/0x30 [9.538601] ret_from_fork+0x2c/0x50 [9.542596]? __pfx_kernel_init+0x10/0x10 [ 9.547170] ret_from_fork_asm+0x1a/0x30 [ 9.551552]  [ 9.555649] La direcci\u00f3n con errores pertenece a la p\u00e1gina f\u00edsica: [ 9.561875] p\u00e1gina: refcount:0 mapcount:0 mapeo:00000000000 \u00cdndice 00000: 0x1 pfn :0x45dd30 [ 9.570821] banderas: 0x200000000000000(nodo=0|zona=2) [ 9.576271] tipo de p\u00e1gina: 0xffffffff() [ 9.580167] raw: 0200000000000000 ffffea0011774c48 12ba1848 0000000000000000 [9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 000000000000000000000000 [9.597476] p\u00e1gina volcada porque: kasan: mal acceso detectado [9.605362] Estado de la memoria alrededor de la direcci\u00f3n con errores: [9.610714] ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.618786] ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.626857] \u0026gt;ffff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.634930] ^ [ 9.638534] ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.646605] ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.654675] ======================= ===============================================\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/bootconfig.h\",\"lib/bootconfig.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"40caa127f3c7279c75cb0c9684559fa314ee3a66\",\"lessThan\":\"1e7feb31a18c197d63a5e606025ed63c762f8918\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40caa127f3c7279c75cb0c9684559fa314ee3a66\",\"lessThan\":\"e46d3be714ad9652480c6db129ab8125e2d20ab7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40caa127f3c7279c75cb0c9684559fa314ee3a66\",\"lessThan\":\"5a7dfb8fcd3f29fc93161100179b27f24f3d5f35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40caa127f3c7279c75cb0c9684559fa314ee3a66\",\"lessThan\":\"89f9a1e876b5a7ad884918c03a46831af202c8a0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/bootconfig.h\",\"lib/bootconfig.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.88\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.29\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8.8\",\"lessThanOrEqual\":\"6.8.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T15:45:03.466509Z\",\"id\":\"CVE-2024-26983\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:11:56+00:00",
      "cve": "CVE-2024-26983",
      "id": "CVE-2024-26983",
      "initial_release_date": "2024-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bootconfig: use memblock_free_late to free xbc memory to buddy",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26983.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1e7feb31a18c197d63a5e606025ed63c762f8918\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/e46d3be714ad9652480c6db129ab8125e2d20ab7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5a7dfb8fcd3f29fc93161100179b27f24f3d5f35\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/89f9a1e876b5a7ad884918c03a46831af202c8a0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-04T17:15:06.403Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26983\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:45:03.466509Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:18.291Z\"}}], \"cna\": {\"title\": \"bootconfig: use memblock_free_late to free xbc memory to buddy\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"40caa127f3c7279c75cb0c9684559fa314ee3a66\", \"lessThan\": \"1e7feb31a18c197d63a5e606025ed63c762f8918\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"40caa127f3c7279c75cb0c9684559fa314ee3a66\", \"lessThan\": \"e46d3be714ad9652480c6db129ab8125e2d20ab7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"40caa127f3c7279c75cb0c9684559fa314ee3a66\", \"lessThan\": \"5a7dfb8fcd3f29fc93161100179b27f24f3d5f35\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"40caa127f3c7279c75cb0c9684559fa314ee3a66\", \"lessThan\": \"89f9a1e876b5a7ad884918c03a46831af202c8a0\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/bootconfig.h\", \"lib/bootconfig.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.29\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/bootconfig.h\", \"lib/bootconfig.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1e7feb31a18c197d63a5e606025ed63c762f8918\"}, {\"url\": \"https://git.kernel.org/stable/c/e46d3be714ad9652480c6db129ab8125e2d20ab7\"}, {\"url\": \"https://git.kernel.org/stable/c/5a7dfb8fcd3f29fc93161100179b27f24f3d5f35\"}, {\"url\": \"https://git.kernel.org/stable/c/89f9a1e876b5a7ad884918c03a46831af202c8a0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbootconfig: use memblock_free_late to free xbc memory to buddy\\n\\nOn the time to free xbc memory in xbc_exit(), memblock may has handed\\nover memory to buddy allocator. So it doesn\u0027t make sense to free memory\\nback to memblock. memblock_free() called by xbc_exit() even causes UAF bugs\\non architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86.\\nFollowing KASAN logs shows this case.\\n\\nThis patch fixes the xbc memory free problem by calling memblock_free()\\nin early xbc init error rewind path and calling memblock_free_late() in\\nxbc exit path to free memory to buddy allocator.\\n\\n[    9.410890] ==================================================================\\n[    9.418962] BUG: KASAN: use-after-free in memblock_isolate_range+0x12d/0x260\\n[    9.426850] Read of size 8 at addr ffff88845dd30000 by task swapper/0/1\\n\\n[    9.435901] CPU: 9 PID: 1 Comm: swapper/0 Tainted: G     U             6.9.0-rc3-00208-g586b5dfb51b9 #5\\n[    9.446403] Hardware name: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 Dec 28 2023\\n[    9.460789] Call Trace:\\n[    9.463518]  \u003cTASK\u003e\\n[    9.465859]  dump_stack_lvl+0x53/0x70\\n[    9.469949]  print_report+0xce/0x610\\n[    9.473944]  ? __virt_addr_valid+0xf5/0x1b0\\n[    9.478619]  ? memblock_isolate_range+0x12d/0x260\\n[    9.483877]  kasan_report+0xc6/0x100\\n[    9.487870]  ? memblock_isolate_range+0x12d/0x260\\n[    9.493125]  memblock_isolate_range+0x12d/0x260\\n[    9.498187]  memblock_phys_free+0xb4/0x160\\n[    9.502762]  ? __pfx_memblock_phys_free+0x10/0x10\\n[    9.508021]  ? mutex_unlock+0x7e/0xd0\\n[    9.512111]  ? __pfx_mutex_unlock+0x10/0x10\\n[    9.516786]  ? kernel_init_freeable+0x2d4/0x430\\n[    9.521850]  ? __pfx_kernel_init+0x10/0x10\\n[    9.526426]  xbc_exit+0x17/0x70\\n[    9.529935]  kernel_init+0x38/0x1e0\\n[    9.533829]  ? _raw_spin_unlock_irq+0xd/0x30\\n[    9.538601]  ret_from_fork+0x2c/0x50\\n[    9.542596]  ? __pfx_kernel_init+0x10/0x10\\n[    9.547170]  ret_from_fork_asm+0x1a/0x30\\n[    9.551552]  \u003c/TASK\u003e\\n\\n[    9.555649] The buggy address belongs to the physical page:\\n[    9.561875] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x45dd30\\n[    9.570821] flags: 0x200000000000000(node=0|zone=2)\\n[    9.576271] page_type: 0xffffffff()\\n[    9.580167] raw: 0200000000000000 ffffea0011774c48 ffffea0012ba1848 0000000000000000\\n[    9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\\n[    9.597476] page dumped because: kasan: bad access detected\\n\\n[    9.605362] Memory state around the buggy address:\\n[    9.610714]  ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[    9.618786]  ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[    9.626857] \u003effff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.634930]                    ^\\n[    9.638534]  ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.646605]  ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n[    9.654675] ==================================================================\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.88\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.29\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:01:27.678Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26983\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T17:15:06.403Z\", \"dateReserved\": \"2024-02-19T14:20:24.204Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:27:15.635Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.