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

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:24
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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    "dateUpdated": "2026-05-11T22:24:58.635Z",
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  }
}


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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

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.