CVE-2026-43502High· 7.8▾ MidnightPoC availableIn the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.9 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.1%
Last analysed / modified upstream
0.1% → 0.3%
In the Linux kernel, the following vulnerability has been resolved:
net/rds: handle zerocopy send cleanup before the message is queued
A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket.
The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue.
Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages.
This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.
linux_kernel >= 4.17, < 5.10.258linux_kernel >= 5.11, < 5.15.209linux_kernel >= 5.16, < 6.1.175linux_kernel >= 6.2, < 6.6.140linux_kernel >= 6.7, < 6.12.88linux_kernel >= 6.13, < 6.18.30linux_kernel >= 6.19, < 7.0.7linux_kernel = 7.1Upgrade past the affected range:
linux_kernel 7.0.7Connected by shared product, vendor, weakness, or advisory.
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