nexthop: initialize extack in nh_res_bucket_migrate()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64576
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 08:16:37 UTC
Updated2026-08-19 17:20:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nexthop: initialize extack in nh_res_bucket_migrate() nh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to call_nexthop_res_bucket_notifiers(). When nh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns -ENOMEM), the error is propagated back before any notifier sets extack._msg, and the error path formats the stale pointer with pr_err_ratelimited("%s\n", extack._msg). With CONFIG_INIT_STACK_NONE this dereferences uninitialized stack memory: Oops: general protection fault, probably for non-canonical address ... KASAN: maybe wild-memory-access in range [...] RIP: 0010:string (lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) _printk (kernel/printk/printk.c:2504) nh_res_bucket_migrate (net/ipv4/nexthop.c:1816) nh_res_table_upkeep (net/ipv4/nexthop.c:1866) rtm_new_nexthop (net/ipv4/nexthop.c:3323) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) netlink_sendmsg (net/netlink/af_netlink.c:1900) Kernel panic - not syncing: Fatal exception Zero-initialize extack so _msg is NULL on error paths that never set it.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.001160000 probability, percentile 0.019070000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 eacd2e2117e8682f937967fda1022e7f1c22d91a git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 37bbd7e1d8df0bec3d187e961783e20c30533d2c git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 c0936c131a71657afc635d0db2ab096d15d473e1 git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 d536bf205c71f700f6de2086038c3e1d77724715 git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 18506d7263768d76ac8e057ba55a4d9da50aad66 git Not specified
CNA Linux Linux affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 6347c5314cee49f364aaf2e40ff15415a57a116e git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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