CVE-2026-74376

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.

References

• https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8
• https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945
• https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442
• https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26
• https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7