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Message-ID: <2025070412-CVE-2025-38184-d45c@gregkh> Date: Fri, 4 Jul 2025 15:37:13 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38184: tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer The reproduction steps: 1. create a tun interface 2. enable l2 bearer 3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun tipc: Started in network mode tipc: Node identity 8af312d38a21, cluster identity 4711 tipc: Enabled bearer <eth:syz_tun>, priority 1 Oops: general protection fault KASAN: null-ptr-deref in range CPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT Hardware name: QEMU Ubuntu 24.04 PC RIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0 the ub was in fact a struct dev. when bid != 0 && skip_cnt != 0, bearer_list[bid] may be NULL or other media when other thread changes it. fix this by checking media_id. The Linux kernel CVE team has assigned CVE-2025-38184 to this issue. Affected and fixed versions =========================== Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 5.4.295 with commit 3998283e4c32c0fe69edd59b0876c193f50abce6 Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 5.10.239 with commit c2e17984752b9131061d1a2ca1199da2706337fd Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 5.15.186 with commit 8595350615f952fcf8bc861464a6bf6b1129af50 Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 6.1.142 with commit 05d332ba075753d569d66333d62d60fff5f57ad8 Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 6.6.95 with commit d3dfe821dfe091c0045044343c8d86596d66e2cf Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 6.12.35 with commit 0d3d91c3500f0c480e016faa4e2259c588616e59 Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 6.15.4 with commit 0f4a72fb266e48dbe928e1d936eab149e4ac3e1b Issue introduced in 4.9 with commit 832629ca5c313e122b22b8e73a6d80f111b1a1ae and fixed in 6.16-rc3 with commit f82727adcf2992822e12198792af450a76ebd5ef 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-2025-38184 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: net/tipc/udp_media.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/3998283e4c32c0fe69edd59b0876c193f50abce6 https://git.kernel.org/stable/c/c2e17984752b9131061d1a2ca1199da2706337fd https://git.kernel.org/stable/c/8595350615f952fcf8bc861464a6bf6b1129af50 https://git.kernel.org/stable/c/05d332ba075753d569d66333d62d60fff5f57ad8 https://git.kernel.org/stable/c/d3dfe821dfe091c0045044343c8d86596d66e2cf https://git.kernel.org/stable/c/0d3d91c3500f0c480e016faa4e2259c588616e59 https://git.kernel.org/stable/c/0f4a72fb266e48dbe928e1d936eab149e4ac3e1b https://git.kernel.org/stable/c/f82727adcf2992822e12198792af450a76ebd5ef
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