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

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-17 15:21
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: 7fad2a432cd35bbf104d2d9d426e74902f22aa95 , < c79cf42321600e931933e11f94aba8b245d4cd66 (git)
Affected: 7fad2a432cd35bbf104d2d9d426e74902f22aa95 , < 1a30468eff661937d978495644d2e5ebfeef5ce6 (git)
Affected: 7fad2a432cd35bbf104d2d9d426e74902f22aa95 , < c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 (git)
Affected: 7fad2a432cd35bbf104d2d9d426e74902f22aa95 , < 262b6d38a81d51b135db81e1f30c13d30e38feee (git)
Affected: 7fad2a432cd35bbf104d2d9d426e74902f22aa95 , < 52f657e34d7b21b47434d9d8b26fa7f6778b63a0 (git)
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    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "arch/x86/kernel/shstk.c",
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              "version": "7.0",
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      ],
      "cpeApplicability": [
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      "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-17T15:21:37.731Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1a30468eff661937d978495644d2e5ebfeef5ce6"
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      "title": "x86: shadow stacks: proper error handling for mmap lock",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43109",
    "datePublished": "2026-05-06T07:40:36.532Z",
    "dateReserved": "2026-05-01T14:12:55.986Z",
    "dateUpdated": "2026-05-17T15:21:37.731Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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  • 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.
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  • 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.



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