CVE-2025-40268

cifs: client: fix memory leak in smb3_fs_context_parse_param

State: Published
Severity: Not scored
Published: Dec 6, 2025
Updated: Oct 30, 2026
Reserved: Apr 16, 2025

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 299bc05e1475a4aa1eb985ade8f39e68c1bba9b9Affected af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 868fc62811d3fabcf5685e14f36377a855d5412dAffected af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 48c17341577e25a22feb13d694374b61d974edbcAffected af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 4515743cc7a42e1d67468402a6420c195532a6faAffected af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6Affected
LinuxLinux	5.11Affected before 5.11Not affected 6.1.191 through 6.1.Not affected 6.6.117 through 6.6.Not affected 6.12.59 through 6.12.Not affected 6.17.9 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 299bc05e1475a4aa1eb985ade8f39e68c1bba9b9Affected
af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 868fc62811d3fabcf5685e14f36377a855d5412dAffected
af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 48c17341577e25a22feb13d694374b61d974edbcAffected
af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before 4515743cc7a42e1d67468402a6420c195532a6faAffected
af1a3d2ba9543e99d78914d8fb88b61d0531d9a1 to before e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6Affected

LinuxLinux

5.11Affected
before 5.11Not affected
6.1.191 through 6.1.*Not affected
6.6.117 through 6.6.*Not affected
6.12.59 through 6.12.*Not affected
6.17.9 through 6.17.*Not affected
6.18 and laterNot affected

References

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