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VulnerabilityPublished Updated

CVE-2025-40268: Linux kernel · cifs: client: fix memory leak in smb3_fs_context_parse_param

Source GCVE Database

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Authoritative record:CVE-2025-40268

Not known to be exploited · fixed in e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 16:33 UTC

Severity
Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6, 4515743cc7a42e1d67468402a6420c195532a6fa, 868fc62811d3fabcf5685e14f36377a855d5412d +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ af1a3d2ba9543e99d78914d8fb88b61d0531d9a1, < e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6
Fixed in
  • e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6
LinuxLinuxAffected
  • ≥ af1a3d2ba9543e99d78914d8fb88b61d0531d9a1, < 4515743cc7a42e1d67468402a6420c195532a6fa
Fixed in
  • 4515743cc7a42e1d67468402a6420c195532a6fa
LinuxLinuxAffected
  • ≥ af1a3d2ba9543e99d78914d8fb88b61d0531d9a1, < 868fc62811d3fabcf5685e14f36377a855d5412d
Fixed in
  • 868fc62811d3fabcf5685e14f36377a855d5412d
LinuxLinuxAffected
  • ≥ af1a3d2ba9543e99d78914d8fb88b61d0531d9a1, < 299bc05e1475a4aa1eb985ade8f39e68c1bba9b9
Fixed in
  • 299bc05e1475a4aa1eb985ade8f39e68c1bba9b9
LinuxLinuxAffected
  • ≥ af1a3d2ba9543e99d78914d8fb88b61d0531d9a1, < 48c17341577e25a22feb13d694374b61d974edbc
Fixed in
  • 48c17341577e25a22feb13d694374b61d974edbc
LinuxLinuxAffected
  • =5.11
Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: client: fix memory leak in smb3_fs_context_parse_param The user calls fsconfig twice, but when the program exits, free() only frees ctx->source for the second fsconfig, not the first. Regarding fc->source, there is no code in the fs context related to its memory reclamation. To fix this memory leak, release the source memory corresponding to ctx or fc before each parsing. syzbot reported: BUG: memory leak unreferenced object 0xffff888128afa360 (size 96): backtrace (crc 79c9c7ba): kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 BUG: memory leak unreferenced object 0xffff888112c7d900 (size 96): backtrace (crc 79c9c7ba): smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438

References

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