Skip to content
Heist/ feed
High

nexthop: initialize extack in nh_res_bucket_migrate()

Type: advisorySource: Official CVE List1 source record

In 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.

Announced Source revision 1
Original source ↗

CVE-2026-64576

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64576

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "eacd2e2117e8682f937967fda1022e7f1c22d91a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "37bbd7e1d8df0bec3d187e961783e20c30533d2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "c0936c131a71657afc635d0db2ab096d15d473e1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "d536bf205c71f700f6de2086038c3e1d77724715",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "18506d7263768d76ac8e057ba55a4d9da50aad66",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324",
        "lessThan": "6347c5314cee49f364aaf2e40ff15415a57a116e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/nexthop.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/nexthop.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64576

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41096 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement