Summary
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085)
* kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 10
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | kernel-rt | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-core | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-debug | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-debug-core | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-debug-devel | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-debug-modules | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-debug-modules-extra | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-devel | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-modules | 4.18.0-553.111.1.rt7.452.el8_10 |
| AlmaLinux · 8 | kernel-rt-modules-extra | 4.18.0-553.111.1.rt7.452.el8_10 |
Vulnerabilities 2
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High 7.8CVE-2026-23001 Public exploit
macvlan: fix possible UAF in macvlan_forward_source()
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointe…
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High 7.5
ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()
In the Linux kernel, the following vulnerability has been resolved: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by a BUG_ON(nhead < 0) at net/core/skbuff.c:2232 in pskb_expand_head(). This bug is tri…