Linux Kernel: rust_binder TOCTOU bug could lead to privilege escalation
CVE-2026-43433 Published on May 8, 2026
rust_binder: avoid reading the written value in offsets array
In the Linux kernel, the following vulnerability has been resolved:
rust_binder: avoid reading the written value in offsets array
When sending a transaction, its offsets array is first copied into the
target proc's vma, and then the values are read back from there. This is
normally fine because the vma is a read-only mapping, so the target
process cannot change the value under us.
However, if the target process somehow gains the ability to write to its
own vma, it could change the offset before it's read back, causing the
kernel to misinterpret what the sender meant. If the sender happens to
send a payload with a specific shape, this could in the worst case lead
to the receiver being able to privilege escalate into the sender.
The intent is that gaining the ability to change the read-only vma of
your own process should not be exploitable, so remove this TOCTOU read
even though it's unexploitable without another Binder bug.
Products Associated with CVE-2026-43433
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Affected Versions
Linux:- Version eafedbc7c050c44744fbdf80bdf3315e860b7513 and below e19afb53f7723b3bd22224f2b0c7dcfa70bb973f is affected.
- Version eafedbc7c050c44744fbdf80bdf3315e860b7513 and below 3672141c93b7a0c0132bf5d5021a4b7f1d663aaa is affected.
- Version eafedbc7c050c44744fbdf80bdf3315e860b7513 and below 4cb9e13fec0de7c942f5f927469beb8e48ddd20f is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.19, <= 6.18.* is unaffected.
- Version 6.19.9, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.