Double Free Affecting kernel-livepatch-6_4_0-150700_53_66-default package, versions <1-150700.15.3.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-SLES157-KERNELLIVEPATCH6401507005366DEFAULT-17902836
  • published9 Jul 2026
  • disclosed8 Jul 2026

Introduced: 8 Jul 2026

CVE-2026-45891  (opens in a new tab)
CWE-415  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 kernel-livepatch-6_4_0-150700_53_66-default to version 1-150700.15.3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6_4_0-150700_53_66-default package and not the kernel-livepatch-6_4_0-150700_53_66-default package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

net: hns3: fix double free issue for tx spare buffer

In hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure is created for rollback. However, the tx_spare pointer in the original ring handle is incorrectly left pointing to the old backup memory.

Later, if memory allocation fails in hns3_init_all_ring() during the setup, the error path attempts to free all newly allocated rings. Since tx_spare contains a stale (non-NULL) pointer from the backup, it is mistaken for a newly allocated buffer and is erroneously freed, leading to a double-free of the backup memory.

The root cause is that the tx_spare field was not cleared after its value was saved in tmp_rings, leaving a dangling pointer.

Fix this by setting tx_spare to NULL in the original ring structure when the creation of the new tx_spare fails. This ensures the error cleanup path only frees genuinely newly allocated buffers.

CVSS Base Scores

version 3.1