CVE-2026-43109 (GCVE-0-2026-43109)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
x86: shadow stacks: proper error handling for mmap lock
Summary
In the Linux kernel, the following vulnerability has been resolved: x86: shadow stacks: proper error handling for mmap lock 김영민 reports that shstk_pop_sigframe() doesn't check for errors from mmap_read_lock_killable(), which is a silly oversight, and also shows that we haven't marked those functions with "__must_check", which would have immediately caught it. So let's fix both issues.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 262b6d38a81d51b135db81e1f30c13d30e38feee (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 52f657e34d7b21b47434d9d8b26fa7f6778b63a0 (git)
Create a notification for this product.
    Linux Linux 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
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/shstk.c",
            "include/linux/mmap_lock.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "262b6d38a81d51b135db81e1f30c13d30e38feee",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "52f657e34d7b21b47434d9d8b26fa7f6778b63a0",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/shstk.c",
            "include/linux/mmap_lock.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86: shadow stacks: proper error handling for mmap lock\n\n\uae40\uc601\ubbfc reports that shstk_pop_sigframe() doesn\u0027t check for errors from\nmmap_read_lock_killable(), which is a silly oversight, and also shows\nthat we haven\u0027t marked those functions with \"__must_check\", which would\nhave immediately caught it.\n\nSo let\u0027s fix both issues."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-06T07:40:36.532Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4"
        },
        {
          "url": "https://git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee"
        },
        {
          "url": "https://git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0"
        }
      ],
      "title": "x86: shadow stacks: proper error handling for mmap lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43109",
    "datePublished": "2026-05-06T07:40:36.532Z",
    "dateReserved": "2026-05-01T14:12:55.986Z",
    "dateUpdated": "2026-05-06T07:40:36.532Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43109",
      "date": "2026-05-06",
      "epss": "0.00017",
      "percentile": "0.04054"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43109\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:24.577\",\"lastModified\":\"2026-05-06T13:07:51.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86: shadow stacks: proper error handling for mmap lock\\n\\n\uae40\uc601\ubbfc reports that shstk_pop_sigframe() doesn\u0027t check for errors from\\nmmap_read_lock_killable(), which is a silly oversight, and also shows\\nthat we haven\u0027t marked those functions with \\\"__must_check\\\", which would\\nhave immediately caught it.\\n\\nSo let\u0027s fix both issues.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
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.