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CVE-2026-99053 Linux CVE debrief

A use-after-free vulnerability exists in the Linux kernel's TIPC (Transparent Inter-Process Communication) module. When a node is found by link name, a reference is not held, allowing the node to be freed while still in use. This can lead to a crash or potentially allow an attacker to execute arbitrary code. The vulnerability is caused by the tipc_node_find_by_name() function returning a node without taking a reference. This can lead to a use-after-free vulnerability when the node is accessed after it has been freed. The Linux kernel's TIPC module has a use-after-free vulnerability that can lead to system crashes, potential code execution, and increased risk of DoS attacks.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-23
Original CVE updated
2026-10-30
Advisory published
2026-10-23
Advisory updated
2026-10-30

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should take priority to patch and update their systems. Linux kernel developers, maintainers, and users should take priority to patch and update their systems. This vulnerability can lead to system crashes, potential code execution, and increased risk of DoS attacks. Linux kernel developers, maintainers, and users should take priority to patch and

Why it matters

The Linux kernel's TIPC module has a use-after-free vulnerability that can lead to system crashes, potential code execution, and increased risk of DoS attacks. Linux kernel developers, maintainers, and users should take priority to patch and update their systems.

  • Potential system crashes due to use-after-free vulnerability
  • Possible code execution with elevated privileges
  • Increased risk of denial-of-service (DoS) attacks
  • Need for patching and updating Linux kernel versions

Technical summary

The Linux kernel's TIPC module has a use-after-free vulnerability. The tipc_node_find_by_name() function returns a node without taking a reference, allowing the node to be freed while still in use. This can lead to a crash or potentially allow an attacker to execute arbitrary code. The vulnerability is caused by the tipc_node_find_by_name() function returning a node without taking a reference. This can lead to a use-after-free vulnerability when the node is accessed after it has been freed. The Linux kernel's TIPC module has a use-after-free vulnerability that can lead to system crashes, potential code execution, and increased risk of DoS attacks. Linux kernel developers and maintainers, Linux distribution and

Defensive priority

High

Recommended defensive actions

  • Review and apply the provided patches to the Linux kernel
  • Ensure that the Linux kernel is updated to a version that includes the fix
  • Monitor the Linux kernel for any signs of exploitation
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by the tipc_node_find_by_name() function returning a node without taking a reference. This can lead to a use-after-free vulnerability when the node is accessed after it has been freed.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-99053 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-99053

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-99053 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-99053

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • tipc: hold a reference to nodes found by link name

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/99xxx/CVE-2026-99053.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.