CVE-2026-43093 (GCVE-0-2026-43093)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-08-05 12:25
VLAI
Title
xsk: tighten UMEM headroom validation to account for tailroom and min frame
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 5f123bc278bf4e3283d8606321bebbfd299f4384 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 1a6051cd7e3e4c54ff3854a43b638b9292af5e67 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 8769708add9eadeea8041a9761771bb715a87104 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < a03975beb9f6af0d8ac051e30b2abeabe618414f (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 0ec4d3f6e6934deb843b561ae048cd17218e5ad1 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < 6523bc1b40e69301f24c14338b762af4739d6d39 (git)
Affected: 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 , < a315e022a72d95ef5f1d4e58e903cb492b0ad931 (git)
Affected: ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee (git)
Affected: 25c9cdef57488578da21d99eb614b97ffcf6e59f (git)
Affected: 98d3c852e63b49129515dd18c875999efaf8530a (git)
Affected: 4.19.118 , < 4.20 (semver)
Affected: 5.4.35 , < 5.5 (semver)
Affected: 5.6.7 , < 5.7 (semver)
Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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Furthermore if multi-buffer would come to play then\\nskb_shared_info stored at the end of XSK frame would be corrupted.\\n\\nHW typically works with 128-aligned sizes so let us provide this value\\nas bare minimum.\\n\\nMulti-buffer setting is known later in the configuration process so\\nbesides accounting for 128 bytes, let us also take care of tailroom space\\nupfront.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xdp/xdp_umem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"5f123bc278bf4e3283d8606321bebbfd299f4384\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"1a6051cd7e3e4c54ff3854a43b638b9292af5e67\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"8769708add9eadeea8041a9761771bb715a87104\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"a03975beb9f6af0d8ac051e30b2abeabe618414f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"0ec4d3f6e6934deb843b561ae048cd17218e5ad1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"6523bc1b40e69301f24c14338b762af4739d6d39\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99e3a236dd43d06c65af0a2ef9cb44306aef6e02\",\"lessThan\":\"a315e022a72d95ef5f1d4e58e903cb492b0ad931\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"25c9cdef57488578da21d99eb614b97ffcf6e59f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"98d3c852e63b49129515dd18c875999efaf8530a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.19.118\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.35\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.6.7\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xdp/xdp_umem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.136\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"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}]},\"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\":\"4.19.118\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"C1D66A78-E0DD-4D66-9446-03DE28F5FE2F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.35\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"4ED55BB9-F8CA-4CCD-94DD-BC6F5E60E5D9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.6.7\",\"versionEndExcluding\":\"5.7\",\"matchCriteriaId\":\"30A44027-1F59-4AF5-B227-86E61A43A865\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncludi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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:49:58+00:00",
      "cve": "CVE-2026-43093",
      "id": "CVE-2026-43093",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xsk: tighten UMEM headroom validation to account for tailroom and min frame",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43093.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-24T02:28:26Z",
      "cve": "CVE-2026-43093",
      "id": "CVE-2026-43093",
      "initial_release_date": "2026-05-07T02:18:43Z",
      "product_status:first_fixed": "55",
      "product_status:known_affected": "572",
      "product_status:known_not_affected": "20",
      "product_status:recommended": "232",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43093",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43093.json",
      "version": "11"
    }
  }
}



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Taxonomy of the tags.





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.