net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.197, 6.1.159, 6.12.59, 6.17.9, 6.6.117
- CVEs
- CVE-2025-40279
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 02:46 UTC · Revision 1
Source evidence
net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
core-osv · Original sourcePublished 6 Dec 2025, 21:51 UTC
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.
osv:CVE-2025-40279
Kernel
Fixed versions: 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9
Complete source record
{
"id": "e94b469697f409748394e7830a6d16f9ac25f9777da91c591b13c549cd912838",
"url": "https://osv.dev/vulnerability/CVE-2025-40279",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "net: sched: act_connmark: initialize struct tc_ife to fix kernel leak",
"summary": "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.",
"evidence": "osv:CVE-2025-40279",
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"modified": "2026-10-28T02:30:32.792858228Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/25837889ec062f2b7618142cd80253dff3da5343",
"https://git.kernel.org/stable/c/31e4aa93e2e5b5647fc235b0f6ee329646878f9e",
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"https://nvd.nist.gov/vuln/detail/CVE-2025-40279",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 499773,
"published_at": "2025-12-06T21:51:03.01+00:00"
}