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Message-ID: <2025120717-CVE-2025-40279-81d3@gregkh> Date: Sun, 7 Dec 2025 06:52:26 +0900 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-40279: net: sched: act_connmark: initialize struct tc_ife to fix kernel leak From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: net: sched: act_connmark: initialize struct tc_ife to fix kernel leak In tcf_connmark_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied. The Linux kernel CVE team has assigned CVE-2025-40279 to this issue. Affected and fixed versions =========================== Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 5.15.197 with commit 218b67c8c8246d47a2a7910eae80abe4861fe2b7 Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 6.1.159 with commit 73cc56c608c209d3d666cc571293b090a471da70 Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 6.6.117 with commit 31e4aa93e2e5b5647fc235b0f6ee329646878f9e Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 6.12.59 with commit 51cb05d4fd632596816ba44e882e84db9fb28a7e Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 6.17.9 with commit 25837889ec062f2b7618142cd80253dff3da5343 Issue introduced in 4.0 with commit 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae and fixed in 6.18 with commit 62b656e43eaeae445a39cd8021a4f47065af4389 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-2025-40279 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/sched/act_connmark.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/218b67c8c8246d47a2a7910eae80abe4861fe2b7 https://git.kernel.org/stable/c/73cc56c608c209d3d666cc571293b090a471da70 https://git.kernel.org/stable/c/31e4aa93e2e5b5647fc235b0f6ee329646878f9e https://git.kernel.org/stable/c/51cb05d4fd632596816ba44e882e84db9fb28a7e https://git.kernel.org/stable/c/25837889ec062f2b7618142cd80253dff3da5343 https://git.kernel.org/stable/c/62b656e43eaeae445a39cd8021a4f47065af4389
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