CVE-2026-43458
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1Patch
- https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98Patch
- https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2aPatch
- https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511cPatch
- https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7dPatch
- https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089Patch
- https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7Patch
- https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.