CVE-2026-43458 (GCVE-0-2026-43458)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-08 14:22
VLAI?
Title
serial: caif: hold tty->link reference in ldisc_open and ser_release
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port. Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path. With this change applied, the reproducer no longer triggers the UAF in my testing.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 23a3ac2e2262a291498567418227b99e1f3606b1 (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 52135420e9f75853ea0c6cea7b736e3e98495f7d (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < ca2ceba983bb23ea0202c2882d963253416654a3 (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 8460187b4852fd00bd1c76394358053f3fa4d089 (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 27e43356d0defb9fc7fa25265219a3ffeb7b3e98 (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 35b58d3bc716ebb9ebd10fe1cac8c1177242511c (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 97a0bb491cae39478c6225381f14e9ac67b7bba7 (git)
Affected: e31d5a05948e4478ba8396063d1e1f39880928e2 , < 288598d80a068a0e9281de35bcb4ce495f189e2a (git)
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    Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/caif/caif_serial.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.35"
            },
            {
              "lessThan": "2.6.35",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: caif: hold tty-\u003elink reference in ldisc_open and ser_release\n\nA reproducer triggers a KASAN slab-use-after-free in pty_write_room()\nwhen caif_serial\u0027s TX path calls tty_write_room(). The faulting access\nis on tty-\u003elink-\u003eport.\n\nHold an extra kref on tty-\u003elink for the lifetime of the caif_serial line\ndiscipline: get it in ldisc_open() and drop it in ser_release(), and\nalso drop it on the ldisc_open() error path.\n\nWith this change applied, the reproducer no longer triggers the UAF in\nmy testing."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T14:22:21.997Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089"
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        },
        {
          "url": "https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a"
        }
      ],
      "title": "serial: caif: hold tty-\u003elink reference in ldisc_open and ser_release",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43458",
    "datePublished": "2026-05-08T14:22:21.997Z",
    "dateReserved": "2026-05-01T14:12:56.010Z",
    "dateUpdated": "2026-05-08T14:22:21.997Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43458\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T15:16:58.630\",\"lastModified\":\"2026-05-08T15:16:58.630\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nserial: caif: hold tty-\u003elink reference in ldisc_open and ser_release\\n\\nA reproducer triggers a KASAN slab-use-after-free in pty_write_room()\\nwhen caif_serial\u0027s TX path calls tty_write_room(). The faulting access\\nis on tty-\u003elink-\u003eport.\\n\\nHold an extra kref on tty-\u003elink for the lifetime of the caif_serial line\\ndiscipline: get it in ldisc_open() and drop it in ser_release(), and\\nalso drop it on the ldisc_open() error path.\\n\\nWith this change applied, the reproducer no longer triggers the UAF in\\nmy testing.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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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.