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Message-ID: <2025100419-CVE-2025-39942-0297@gregkh> Date: Sat, 4 Oct 2025 09:33:26 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-39942: ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size This is inspired by the check for data_offset + data_length. The Linux kernel CVE team has assigned CVE-2025-39942 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit 2ea086e35c3d726a3bacd0a971c1f02a50e98206 and fixed in 6.1.154 with commit 196a3a7676d726ee67621ea2bf3b7815ac2685b4 Issue introduced in 5.15 with commit 2ea086e35c3d726a3bacd0a971c1f02a50e98206 and fixed in 6.6.108 with commit d3cb3f209d35c44b7ee74f77ed27ebb28995b9ce Issue introduced in 5.15 with commit 2ea086e35c3d726a3bacd0a971c1f02a50e98206 and fixed in 6.12.49 with commit 9644798294c7287e65a7b26e35aa6d2ce3345bcc Issue introduced in 5.15 with commit 2ea086e35c3d726a3bacd0a971c1f02a50e98206 and fixed in 6.16.9 with commit c64b915bb3d9339adcae5db4be2c35ffbef5e615 Issue introduced in 5.15 with commit 2ea086e35c3d726a3bacd0a971c1f02a50e98206 and fixed in 6.17 with commit e1868ba37fd27c6a68e31565402b154beaa65df0 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-39942 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: fs/smb/server/transport_rdma.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/196a3a7676d726ee67621ea2bf3b7815ac2685b4 https://git.kernel.org/stable/c/d3cb3f209d35c44b7ee74f77ed27ebb28995b9ce https://git.kernel.org/stable/c/9644798294c7287e65a7b26e35aa6d2ce3345bcc https://git.kernel.org/stable/c/c64b915bb3d9339adcae5db4be2c35ffbef5e615 https://git.kernel.org/stable/c/e1868ba37fd27c6a68e31565402b154beaa65df0
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