CVE-2026-64576nexthop: initialize extack in nh_res_bucket_migrate()
- 7.1HighCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 17 days later
· 17 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < eacd2e2117e8682f937967fda1022e7f1c22d91a
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < 37bbd7e1d8df0bec3d187e961783e20c30533d2c
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < c0936c131a71657afc635d0db2ab096d15d473e1
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < 3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < d536bf205c71f700f6de2086038c3e1d77724715
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < 18506d7263768d76ac8e057ba55a4d9da50aad66
- affected 7c37c7e00411b3d1e0c5292368317aca69d1f324 – < 6347c5314cee49f364aaf2e40ff15415a57a116e
- affected 5.13
- unaffected < 5.13
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a (opens in a new tab)
- https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c (opens in a new tab)
- https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1 (opens in a new tab)
- https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d (opens in a new tab)
- https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715 (opens in a new tab)
- https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66 (opens in a new tab)
- https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-53270 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64576)Record last updated .