Vulnerability-Lookup

FKIE_CVE-2026-43458

Vulnerability from fkie_nvd - Published: 2026-05-08 15:16 - Updated: 2026-05-21 16:47

Severity

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

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3	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	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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          "integrityImpact": "HIGH",
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          "scope": "UNCHANGED",
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}

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

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:24

Title

serial: caif: hold tty->link reference in ldisc_open and ser_release

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/23a3ac2e2262a2914…
https://git.kernel.org/stable/c/52135420e9f75853e…
https://git.kernel.org/stable/c/ca2ceba983bb23ea0…
https://git.kernel.org/stable/c/8460187b4852fd00b…
https://git.kernel.org/stable/c/27e43356d0defb9fc…
https://git.kernel.org/stable/c/35b58d3bc716ebb9e…
https://git.kernel.org/stable/c/97a0bb491cae39478…
https://git.kernel.org/stable/c/288598d80a068a0e9…

Impacted products

2 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)
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)

Show details on NVD website

JSON

To clipboard

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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/net/caif/caif_serial.c"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a"
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      ],
      "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",
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    "datePublished": "2026-05-08T14:22:21.997Z",
    "dateReserved": "2026-05-01T14:12:56.010Z",
    "dateUpdated": "2026-05-11T22:24:58.635Z",
    "state": "PUBLISHED"
  },
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  "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-2026-43458

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

Tags

Sightings

Nomenclature