serial: caif: hold tty->link reference in ldisc_open and ser_release
Summary
| CVE | CVE-2026-43458 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:58 UTC |
| Updated | 2026-05-12 14:10:27 UTC |
| 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.070360000 (date 2026-05-12)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 23a3ac2e2262a291498567418227b99e1f3606b1 git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 52135420e9f75853ea0c6cea7b736e3e98495f7d git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 ca2ceba983bb23ea0202c2882d963253416654a3 git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 8460187b4852fd00bd1c76394358053f3fa4d089 git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 27e43356d0defb9fc7fa25265219a3ffeb7b3e98 git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 35b58d3bc716ebb9ebd10fe1cac8c1177242511c git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 97a0bb491cae39478c6225381f14e9ac67b7bba7 git | Not specified |
| CNA | Linux | Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 288598d80a068a0e9281de35bcb4ce495f189e2a git | Not specified |
| CNA | Linux | Linux | affected 2.6.35 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.35 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.