CVE-2026-23140 (GCVE-0-2026-23140)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:22 – Updated: 2026-02-14 15:22
VLAI?
Title
bpf, test_run: Subtract size of xdp_frame from allowed metadata size
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, test_run: Subtract size of xdp_frame from allowed metadata size The xdp_frame structure takes up part of the XDP frame headroom, limiting the size of the metadata. However, in bpf_test_run, we don't take this into account, which makes it possible for userspace to supply a metadata size that is too large (taking up the entire headroom). If userspace supplies such a large metadata size in live packet mode, the xdp_update_frame_from_buff() call in xdp_test_run_init_page() call will fail, after which packet transmission proceeds with an uninitialised frame structure, leading to the usual Bad Stuff. The commit in the Fixes tag fixed a related bug where the second check in xdp_update_frame_from_buff() could fail, but did not add any additional constraints on the metadata size. Complete the fix by adding an additional check on the metadata size. Reorder the checks slightly to make the logic clearer and add a comment.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b6f1f780b3932ae497ed85e79bc8a1e513883624 , < e7440935063949d6f2c10f7328d960d0ff4bce90 (git)
Affected: b6f1f780b3932ae497ed85e79bc8a1e513883624 , < 7c81ad5e580bd8441f8a521a8d34824ce6582ae5 (git)
Affected: b6f1f780b3932ae497ed85e79bc8a1e513883624 , < 6447e697cfa8a43a8e491cb81bcc390d0f28f8ba (git)
Affected: b6f1f780b3932ae497ed85e79bc8a1e513883624 , < 31e37f44b60679d90b9f999c91371b15291be8e0 (git)
Affected: b6f1f780b3932ae497ed85e79bc8a1e513883624 , < e558cca217790286e799a8baacd1610bda31b261 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-01-13T15:37:45.972Z",
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Sin embargo, en bpf_test_run, no tenemos esto en cuenta, lo que hace posible que el userspace suministre un tama\u00f1o de metadatos que es demasiado grande (ocupando todo el headroom).\\n\\nSi el userspace suministra un tama\u00f1o de metadatos tan grande en modo de paquete en vivo, la llamada a xdp_update_frame_from_buff() en la llamada a xdp_test_run_init_page() fallar\u00e1, despu\u00e9s de lo cual la transmisi\u00f3n de paquetes procede con una estructura de frame no inicializada, lo que lleva a las \u0027Cosas Malas\u0027 habituales.\\n\\nEl commit en la etiqueta Fixes corrigi\u00f3 un error relacionado donde la segunda comprobaci\u00f3n en xdp_update_frame_from_buff() podr\u00eda fallar, pero no a\u00f1adi\u00f3 ninguna restricci\u00f3n adicional sobre el tama\u00f1o de los metadatos. Completar la correcci\u00f3n a\u00f1adiendo una comprobaci\u00f3n adicional sobre el tama\u00f1o de los metadatos. Reordenar ligeramente las comprobaciones para hacer la l\u00f3gica m\u00e1s clara y a\u00f1adir un comentario.\"}],\"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\":\"5.18\",\"versionEndExcluding\":\"6.1.161\",\"matchCriteriaId\":\"D8396A00-9DF6-4F41-B27A-476CA41851D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.121\",\"matchCriteriaId\":\"BB7A164B-7422-4A1C-82FB-5FCAEE53C06C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.66\",\"matchCriteriaId\":\"F72B884C-B44F-40E4-9895-CE421AC663D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.6\",\"matchCriteriaId\":\"879529BC-5B4C-4EBE-BF1D-1A31404A8B2E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31e37f44b60679d90b9f999c91371b15291be8e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6447e697cfa8a43a8e491cb81bcc390d0f28f8ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7c81ad5e580bd8441f8a521a8d34824ce6582ae5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e558cca217790286e799a8baacd1610bda31b261\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e7440935063949d6f2c10f7328d960d0ff4bce90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Sightings

Author Source Type Date

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.