Vulnerability-Lookup

FKIE_CVE-2026-43190

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-11 20:50

Severity ?

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length before reading optlen Quoting reporter: In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads op[i+1] directly without validating the remaining option length. If the last byte of the option field is not EOL/NOP (0/1), the code attempts to index op[i+1]. In the case where i + 1 == optlen, this causes an out-of-bounds read, accessing memory past the optlen boundary (either reading beyond the stack buffer _opt or the following payload).

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12

JSON

To clipboard

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          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "userInteraction": "NONE",
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}

CVE-2026-43190 (GCVE-0-2026-43190)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:19

Title

netfilter: xt_tcpmss: check remaining length before reading optlen

Summary

Severity ?

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/f895191dc32c53eaf…
https://git.kernel.org/stable/c/cd5beda7e0e32865e…
https://git.kernel.org/stable/c/eaedc0bc18be46fe7…
https://git.kernel.org/stable/c/07a9b32eaae792ff7…
https://git.kernel.org/stable/c/8b300f726640c48c3…
https://git.kernel.org/stable/c/5e13d0a37666955b6…
https://git.kernel.org/stable/c/f6c412dcfd76b0516…
https://git.kernel.org/stable/c/735ee8582da3d239e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f895191dc32c53eaf443b6443fe40945b2f92287 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cd5beda7e0e32865e214f28034bb92c1cecff885 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eaedc0bc18be46fe7f58170e967959a932c4f824 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 07a9b32eaae792ff7d0fcac14d8920c937c0a9c3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8b300f726640c48c3edfe9c453334dd801f4b74e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5e13d0a37666955b6cfddc0f73cb40ed645b8a05 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f6c412dcfd76b0516d51aa847d8f4c7b70381b09 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 735ee8582da3d239eb0c7a53adca61b79fb228b3 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/xt_tcpmss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "netfilter: xt_tcpmss: check remaining length before reading optlen",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43190",
    "datePublished": "2026-05-06T11:27:59.798Z",
    "dateReserved": "2026-05-01T14:12:55.992Z",
    "dateUpdated": "2026-05-11T22:19:35.257Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-43190

CVE-2026-43190 (GCVE-0-2026-43190)

Tags

Sightings

Nomenclature