PinTheft: Linux kernel LPE (CVE-2026-43494)
# Disclosure agreement
This issue will most likely be made publicly eventually. If you need to write contents that should not be disclosed ever, write it in an _internal note_.
# Summary
https://github.com/v12-security/pocs/tree/main/pintheft:
> PinTheft is a Linux local privilege escalation exploit for an RDS zerocopy double-free that can be turned into a page-cache overwrite through `io_uring` fixed buffers.
# To Do
- [x] Set milestone to the upcoming release
- We can fine-tune this later once we have assessed severity.
- [x] Fill the _Summary_, _Impact_, and _Availability_ sections, so that:
- We can assess the severity of this issue.
- Our technical writers have the information they need to write release notes.
- [x] Assess the severity of this issue according to our [Security issue response policy](https://tails.net/contribute/security_policy/)
- [x] Have the severity assessment confirmed by another Tails Team member
- [ ] Track the next steps, according to our [Security issue response policy](https://tails.net/contribute/security_policy/)
- The next steps depend on the severity of this issue.
- For example: track when this issue can be disclosed, in a way that will survive this issue being closed and the corresponding MR being merged.
- [ ] [Decide](https://tails.net/contribute/working_together/roles/release_manager/#emergency-release) whether we will do an emergency release or document mitigation measures
# Impact
(What happens if an attacker successfully exploits this security issue. Focus on what this means _practically_ for a user's safety.)
# Availability
None: we block loading `rds`. Details: https://gitlab.tails.boum.org/tails/tails/-/work_items/21613#note_284452
# Details
(How exactly can an attacker exploit this security issue.)
# Possible fixes
(Ideas about how we could fix this security issue.)
# Related documentation
- [Security issue response policy](https://tails.net/contribute/security_policy/)
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