CVE-2024-53125 (GCVE-0-2024-53125)

Vulnerability from cvelistv5 – Published: 2024-12-04 14:11 – Updated: 2026-05-11 20:51
VLAI
Title
bpf: sync_linked_regs() must preserve subreg_def
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: sync_linked_regs() must preserve subreg_def Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set: 0: call bpf_ktime_get_ns call bpf_ktime_get_ns 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff 2: w1 = w0 rewrites w1 = w0 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r) 4: r1 >>= 32 r11 <<= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: exit; if w0 < 0xa goto pc+0 r1 >>= 32 r0 = r1 exit (or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half). The following happens w/o this patch: - r0 is marked as not a subreg at (0); - w1 is marked as subreg at (2); - w1 subreg_def is overridden at (3) by copy_register_state(); - w1 is read at (5) but mark_insn_zext() does not mark (2) for zero extension, because w1 subreg_def is not set; - because of BPF_F_TEST_RND_HI32 flag verifier inserts random value for hi32 bits of (2) (marked (r)); - this random value is read at (5).
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 75748837b7e56919679e02163f45d5818c644d03 , < dadf82c1b2608727bcc306843b540cd7414055a7 (git)
Affected: 75748837b7e56919679e02163f45d5818c644d03 , < b57ac2d92c1f565743f6890a5b9cf317ed856b09 (git)
Affected: 75748837b7e56919679e02163f45d5818c644d03 , < 60fd3538d2a8fd44c41d25088c0ece3e1fd30659 (git)
Affected: 75748837b7e56919679e02163f45d5818c644d03 , < bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84 (git)
Affected: 75748837b7e56919679e02163f45d5818c644d03 , < e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0 (git)
Affected: 75748837b7e56919679e02163f45d5818c644d03 , < e9bd9c498cb0f5843996dbe5cbce7a1836a83c70 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.232 , ≤ 5.10.* (semver)
Unaffected: 5.15.175 , ≤ 5.15.* (semver)
Unaffected: 6.1.121 , ≤ 6.1.* (semver)
Unaffected: 6.6.67 , ≤ 6.6.* (semver)
Unaffected: 6.11.6 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sync_linked_regs() must preserve subreg_def\n\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n\n  0: call bpf_ktime_get_ns                   call bpf_ktime_get_ns\n  1: r0 \u0026= 0x7fffffff       after verifier   r0 \u0026= 0x7fffffff\n  2: w1 = w0                rewrites         w1 = w0\n  3: if w0 \u003c 10 goto +0     --------------\u003e  r11 = 0x2f5674a6     (r)\n  4: r1 \u003e\u003e= 32                               r11 \u003c\u003c= 32           (r)\n  5: r0 = r1                                 r1 |= r11            (r)\n  6: exit;                                   if w0 \u003c 0xa goto pc+0\n                                             r1 \u003e\u003e= 32\n                                             r0 = r1\n                                             exit\n\n(or zero extension of w1 at (2) is missing for architectures that\n require zero extension for upper register half).\n\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\n  for zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\n  value for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53125",
    "datePublished": "2024-12-04T14:11:09.326Z",
    "dateReserved": "2024-11-19T17:17:24.995Z",
    "dateUpdated": "2026-05-11T20:51:19.837Z",
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      "cve": "CVE-2024-53125",
      "date": "2026-06-11",
      "epss": "0.00014",
      "percentile": "0.0259"
    },
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: sync_linked_regs() must preserve subreg_def\\n\\nRange propagation must not affect subreg_def marks, otherwise the\\nfollowing example is rewritten by verifier incorrectly when\\nBPF_F_TEST_RND_HI32 flag is set:\\n\\n  0: call bpf_ktime_get_ns                   call bpf_ktime_get_ns\\n  1: r0 \u0026= 0x7fffffff       after verifier   r0 \u0026= 0x7fffffff\\n  2: w1 = w0                rewrites         w1 = w0\\n  3: if w0 \u003c 10 goto +0     --------------\u003e  r11 = 0x2f5674a6     (r)\\n  4: r1 \u003e\u003e= 32                               r11 \u003c\u003c= 32           (r)\\n  5: r0 = r1                                 r1 |= r11            (r)\\n  6: exit;                                   if w0 \u003c 0xa goto pc+0\\n                                             r1 \u003e\u003e= 32\\n                                             r0 = r1\\n                                             exit\\n\\n(or zero extension of w1 at (2) is missing for architectures that\\n require zero extension for upper register half).\\n\\nThe following happens w/o this patch:\\n- r0 is marked as not a subreg at (0);\\n- w1 is marked as subreg at (2);\\n- w1 subreg_def is overridden at (3) by copy_register_state();\\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\\n  for zero extension, because w1 subreg_def is not set;\\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\\n  value for hi32 bits of (2) (marked (r));\\n- this random value is read at (5).\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: sync_linked_regs() debe preservar subreg_def La propagaci\\u00f3n del rango no debe afectar a las marcas subreg_def, de lo contrario el siguiente ejemplo es reescrito incorrectamente por el verificador cuando el indicador BPF_F_TEST_RND_HI32 est\\u00e1 establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 \u0026amp;= 0x7fffffff despu\\u00e9s del verificador r0 \u0026amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 \u0026lt; 10 goto +0 --------------\u0026gt; r11 = 0x2f5674a6 (r) 4: r1 \u0026gt;\u0026gt;= 32 r11 \u0026lt;\u0026lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 \u0026lt; 0xa goto pc+0 r1 \u0026gt;\u0026gt;= 32 r0 = r1 salir (o falta la extensi\\u00f3n cero de w1 en (2) para arquitecturas que requieren extensi\\u00f3n cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 est\\u00e1 marcado como no un subreg en (0); - w1 est\\u00e1 marcado como subreg en (2); - el subreg_def de w1 es anulado en (3) por copy_register_state(); - w1 se lee en (5) pero mark_insn_zext() no marca (2) para extensi\\u00f3n cero, porque el subreg_def de w1 no est\\u00e1 configurado; - debido al indicador BPF_F_TEST_RND_HI32, el verificador inserta un valor aleatorio para los bits hi32 de (2) (marcado (r)); - este valor aleatorio se lee en (5).\"}]",
      "id": "CVE-2024-53125",
      "lastModified": "2024-12-19T19:15:07.613",
      "published": "2024-12-04T14:15:20.460",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-53125\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-04T14:15:20.460\",\"lastModified\":\"2025-11-03T21:17:28.030\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: sync_linked_regs() must preserve subreg_def\\n\\nRange propagation must not affect subreg_def marks, otherwise the\\nfollowing example is rewritten by verifier incorrectly when\\nBPF_F_TEST_RND_HI32 flag is set:\\n\\n  0: call bpf_ktime_get_ns                   call bpf_ktime_get_ns\\n  1: r0 \u0026= 0x7fffffff       after verifier   r0 \u0026= 0x7fffffff\\n  2: w1 = w0                rewrites         w1 = w0\\n  3: if w0 \u003c 10 goto +0     --------------\u003e  r11 = 0x2f5674a6     (r)\\n  4: r1 \u003e\u003e= 32                               r11 \u003c\u003c= 32           (r)\\n  5: r0 = r1                                 r1 |= r11            (r)\\n  6: exit;                                   if w0 \u003c 0xa goto pc+0\\n                                             r1 \u003e\u003e= 32\\n                                             r0 = r1\\n                                             exit\\n\\n(or zero extension of w1 at (2) is missing for architectures that\\n require zero extension for upper register half).\\n\\nThe following happens w/o this patch:\\n- r0 is marked as not a subreg at (0);\\n- w1 is marked as subreg at (2);\\n- w1 subreg_def is overridden at (3) by copy_register_state();\\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\\n  for zero extension, because w1 subreg_def is not set;\\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\\n  value for hi32 bits of (2) (marked (r));\\n- this random value is read at (5).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: sync_linked_regs() debe preservar subreg_def La propagaci\u00f3n del rango no debe afectar a las marcas subreg_def, de lo contrario el siguiente ejemplo es reescrito incorrectamente por el verificador cuando el indicador BPF_F_TEST_RND_HI32 est\u00e1 establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 \u0026amp;= 0x7fffffff despu\u00e9s del verificador r0 \u0026amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 \u0026lt; 10 goto +0 --------------\u0026gt; r11 = 0x2f5674a6 (r) 4: r1 \u0026gt;\u0026gt;= 32 r11 \u0026lt;\u0026lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 \u0026lt; 0xa goto pc+0 r1 \u0026gt;\u0026gt;= 32 r0 = r1 salir (o falta la extensi\u00f3n cero de w1 en (2) para arquitecturas que requieren extensi\u00f3n cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 est\u00e1 marcado como no un subreg en (0); - w1 est\u00e1 marcado como subreg en (2); - el subreg_def de w1 es anulado en (3) por copy_register_state(); - w1 se lee en (5) pero mark_insn_zext() no marca (2) para extensi\u00f3n cero, porque el subreg_def de w1 no est\u00e1 configurado; - debido al indicador BPF_F_TEST_RND_HI32, el verificador inserta un valor aleatorio para los bits hi32 de (2) (marcado (r)); - este valor aleatorio se lee en (5).\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10\",\"versionEndExcluding\":\"5.10.232\",\"matchCriteriaId\":\"B50D4783-5CDB-499A-93A7-623C72578301\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.175\",\"matchCriteriaId\":\"7A1F3620-6900-4852-9229-C3527377EBDA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.121\",\"matchCriteriaId\":\"D8DA16A0-9C6E-493E-90EE-309A34901477\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.67\",\"matchCriteriaId\":\"BF4F2CD1-2CA6-4D6B-9B0C-57C3C4D6544A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.6\",\"matchCriteriaId\":\"E4486B12-007B-4794-9857-F07145637AA1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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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.