CVE-2026-23052 (GCVE-0-2026-23052)
Vulnerability from cvelistv5
Published
2026-02-04 16:04
Modified
2026-07-04 11:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not over-allocate ftrace memory The pg_remaining calculation in ftrace_process_locs() assumes that ENTRIES_PER_PAGE multiplied by 2^order equals the actual capacity of the allocated page group. However, ENTRIES_PER_PAGE is PAGE_SIZE / ENTRY_SIZE (integer division). When PAGE_SIZE is not a multiple of ENTRY_SIZE (e.g. 4096 / 24 = 170 with remainder 16), high-order allocations (like 256 pages) have significantly more capacity than 256 * 170. This leads to pg_remaining being underestimated, which in turn makes skip (derived from skipped - pg_remaining) larger than expected, causing the WARN(skip != remaining) to trigger. Extra allocated pages for ftrace: 2 with 654 skipped WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0 A similar problem in ftrace_allocate_records() can result in allocating too many pages. This can trigger the second warning in ftrace_process_locs(). Extra allocated pages for ftrace WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580 Use the actual capacity of a page group to determine the number of pages to allocate. Have ftrace_allocate_pages() return the number of allocated pages to avoid having to calculate it. Use the actual page group capacity when validating the number of unused pages due to skipped entries. Drop the definition of ENTRIES_PER_PAGE since it is no longer used.
References
Impacted products
Vendor Product Version
Linux Linux Version: dc06779d338de4e5a46166a93ec124222e09f40a
Version: 2a6ce8bddd8aafa61aaa705e76eae810f22429be
Version: 4a3efc6baff931da9a85c6d2e42c87bd9a827399
Version: 4a3efc6baff931da9a85c6d2e42c87bd9a827399
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ftrace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.15"
            },
            {
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              "status": "unaffected",
              "version": "0",
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              "version": "6.18.7",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionEndExcluding": "6.18.7",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Do not over-allocate ftrace memory\n\nThe pg_remaining calculation in ftrace_process_locs() assumes that\nENTRIES_PER_PAGE multiplied by 2^order equals the actual capacity of the\nallocated page group. However, ENTRIES_PER_PAGE is PAGE_SIZE / ENTRY_SIZE\n(integer division). When PAGE_SIZE is not a multiple of ENTRY_SIZE (e.g.\n4096 / 24 = 170 with remainder 16), high-order allocations (like 256 pages)\nhave significantly more capacity than 256 * 170. This leads to pg_remaining\nbeing underestimated, which in turn makes skip (derived from skipped -\npg_remaining) larger than expected, causing the WARN(skip != remaining)\nto trigger.\n\nExtra allocated pages for ftrace: 2 with 654 skipped\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0\n\nA similar problem in ftrace_allocate_records() can result in allocating\ntoo many pages. This can trigger the second warning in\nftrace_process_locs().\n\nExtra allocated pages for ftrace\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580\n\nUse the actual capacity of a page group to determine the number of pages\nto allocate. Have ftrace_allocate_pages() return the number of allocated\npages to avoid having to calculate it. Use the actual page group capacity\nwhen validating the number of unused pages due to skipped entries.\nDrop the definition of ENTRIES_PER_PAGE since it is no longer used."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-04T11:50:25.608Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf802b936a7b269917e4dc233e49f6a928db8286"
        },
        {
          "url": "https://git.kernel.org/stable/c/23936d19e4383c8dfb03931f032473d4baf92533"
        },
        {
          "url": "https://git.kernel.org/stable/c/9aef476717994e96dadfb359641c4b82b521aa36"
        },
        {
          "url": "https://git.kernel.org/stable/c/be55257fab181b93af38f8c4b1b3cb453a78d742"
        }
      ],
      "title": "ftrace: Do not over-allocate ftrace memory",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23052",
    "datePublished": "2026-02-04T16:04:21.739Z",
    "dateReserved": "2026-01-13T15:37:45.950Z",
    "dateUpdated": "2026-07-04T11:50:25.608Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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