CVE-2026-43458
serial: caif: hold tty->link reference in ldisc_open and ser_release
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 8, 2026 |
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Affected Versions
Linux / Linux
e31d5a05948e4478ba8396063d1e1f39880928e2 < 23a3ac2e2262a291498567418227b99e1f3606b1 e31d5a05948e4478ba8396063d1e1f39880928e2 < 52135420e9f75853ea0c6cea7b736e3e98495f7d e31d5a05948e4478ba8396063d1e1f39880928e2 < ca2ceba983bb23ea0202c2882d963253416654a3 e31d5a05948e4478ba8396063d1e1f39880928e2 < 8460187b4852fd00bd1c76394358053f3fa4d089 e31d5a05948e4478ba8396063d1e1f39880928e2 < 27e43356d0defb9fc7fa25265219a3ffeb7b3e98 e31d5a05948e4478ba8396063d1e1f39880928e2 < 35b58d3bc716ebb9ebd10fe1cac8c1177242511c e31d5a05948e4478ba8396063d1e1f39880928e2 < 97a0bb491cae39478c6225381f14e9ac67b7bba7 e31d5a05948e4478ba8396063d1e1f39880928e2 < 288598d80a068a0e9281de35bcb4ce495f189e2a
Linux / Linux
2.6.35
References
git.kernel.org: https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1 git.kernel.org: https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d git.kernel.org: https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3 git.kernel.org: https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089 git.kernel.org: https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98 git.kernel.org: https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c git.kernel.org: https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7 git.kernel.org: https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a