rhsa-2025:9497
Vulnerability from csaf_redhat
Published
2025-06-24 05:08
Modified
2025-07-24 03:15
Summary
Red Hat Security Advisory: kernel security update

Notes

Topic
An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: tipc: fix use-after-free Read in tipc_named_reinit (CVE-2022-49696) * kernel: ndisc: use RCU protection in ndisc_alloc_skb() (CVE-2025-21764) 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.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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          "text": "kernel: tipc: fix use-after-free Read in tipc_named_reinit",
          "title": "Vulnerability summary"
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        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "title": "kernel: tipc: fix use-after-free Read in tipc_named_reinit"
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          "text": "2348575"
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          "category": "description",
          "text": "A vulnerability was found in the Linux kernel\u0027s IPv6 Neighbor Discovery (NDISC) subsystem, which manages network neighbor information. The issue arises from improper synchronization mechanisms when allocating socket buffers (sk_buff) in the ndisc_alloc_skb() function. Specifically, the function can be called without holding the necessary Read-Copy-Update (RCU) or Routing Netlink (RTNL) locks, leading to a potential use-after-free (UAF) condition. This flaw allows an attacker with local access and low privileges to exploit the race condition, potentially causing system instability or crashes.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: ndisc: use RCU protection in ndisc_alloc_skb()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security has rated this bug as Moderate due to the following:\n\nDifficult to exploit reliably:\n* Requires winning a race condition in the kernel.\n* No known public PoC or exploitation.\n* Might be nondeterministic and hard to control memory reuse.\n\nMay not lead to code execution:\n* Use After Free doesn\u2019t automatically mean control.\n* Many kernel UAFs cause crashes but not privilege escalation or info leaks unless paired with other bugs.\n\nLimited exposure:\n* Requires IPv6 to be enabled.\n* Possibly depends on attacker having raw socket access or other local privileges.\n* Mitigations Like KASLR, SLAB hardening, and SELinux may further reduce practical risk.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "title": "kernel: ndisc: use RCU protection in ndisc_alloc_skb()"
    }
  ]
}


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