CVE-2026-43458
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.170-1 |
| debian | bullseye | fixed | 5.10.257-1 |
| debian | forky | fixed | 6.19.10-1 |
| debian | sid | fixed | 6.19.10-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 5.10.253 | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1
- https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98
- https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a
- https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c
- https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d
- https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089
- https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7
- https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3
- https://www.suse.com/security/cve/CVE-2026-43458.html
- https://security-tracker.debian.org/tracker/CVE-2026-43458
CWEs
CWE-416
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.