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Vulnerability record · CVE-2026-43502 · published 21 May 2026

CVE-2026-43502: Linux kernel memory leak vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.3% CWE-401 · Memory leak
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
15 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b Patch
https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e Patch
https://git.kernel.org/stable/c/1e262db7675e27f42c3f3f47d6011855f4454f24 Patch
https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e Patch
https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46 Patch
https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa Patch
https://git.kernel.org/stable/c/46662f7dc59475995609bf3e9d27eb36f4acf26f Patch
https://git.kernel.org/stable/c/e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 Patch
https://github.com/NebuSec/CyberMeowfia/tree/main/security-research/Linux-CVE-2026-43502-openSUSE-6.4.0-150600

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Source: NIST National Vulnerability Database (record CVE-2026-43502), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.