Bug 2492389 (CVE-2026-52967)

Summary: CVE-2026-52967 kernel: smb/client: fix possible infinite loop and oob read in symlink_data()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Server Message Block (SMB) client. This vulnerability, located in the `symlink_data()` function, could allow a malicious SMB server to trigger an infinite loop, leading to a Denial of Service (DoS) condition. Additionally, an out-of-bounds read could occur, potentially leading to information disclosure.
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Description OSIDB Bzimport 2026-06-24 18:09:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

smb/client: fix possible infinite loop and oob read in symlink_data()

On 32-bit architectures, the infinite loop is as follows:

  len = p->ErrorDataLength == 0xfffffff8
  u8 *next = p->ErrorContextData + len
  next == p

On 32-bit architectures, the out-of-bounds read is as follows:

  len = p->ErrorDataLength == 0xfffffff0
  u8 *next = p->ErrorContextData + len
  next == (u8 *)p - 8
Comment 1 Keith Grant 2026-06-25 19:59:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062438-CVE-2026-52967-0fd6@gregkh/T