- 5.5MediumCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% 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: ipv6: release nexthop on device removal The CI is hitting some aperiodic hangup at device removal time in the pmtu.sh self-test: unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6 ref_tracker: veth_A-R1@ffff888013df15d8 has 1/5 users at dst_init+0x84/0x4a0 dst_alloc+0x97/0x150 ip6_dst_alloc+0x23/0x90 ip6_rt_pcpu_alloc+0x1e6/0x520 ip6_pol_route+0x56f/0x840 fib6_rule_lookup+0x334/0x630 ip6_route_output_flags+0x259/0x480 ip6_dst_lookup_tail.constprop.0+0x5c2/0x940 ip6_dst_lookup_flow+0x88/0x190 udp_tunnel6_dst_lookup+0x2a7/0x4c0 vxlan_xmit_one+0xbde/0x4a50 [vxlan] vxlan_xmit+0x9ad/0xf20 [vxlan] dev_hard_start_xmit+0x10e/0x360 __dev_queue_xmit+0xf95/0x18c0 arp_solicit+0x4a2/0xe00 neigh_probe+0xaa/0xf0 While the first suspect is the dst_cache, explicitly tracking the dst owing the last device reference via probes proved such dst is held by the nexthop in the originating fib6_info. Similar to commit f5b51fe804ec ("ipv6: route: purge exception on removal"), we need to explicitly release the originating fib info when disconnecting a to-be-removed device from a live ipv6 dst: move the fib6_info cleanup into ip6_dst_ifdown(). Tested running: ./pmtu.sh cleanup_ipv6_exception in a tight loop for more than 400 iterations with no spat, running an unpatched kernel I observed a splat every ~10 iterations.
Timeline
ID reserved
By Linux
Published
- 23 months later
· 23 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 |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (11 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: Medium 5.5.
Affected products
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < 77aa9855a878fb43f547ddfbda3127a1e88ad31a
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < b2f26a27ea3f72f75d18330f76f5d1007c791848
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < 43e25adc80269f917d2a195f0d59f74cdd182955
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < a3c3f8a4d025acc8c857246ec2b812c59102487a
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < 0e4c6faaef8a24b762a24ffb767280e263ef8e10
- affected f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 – < eb02688c5c45c3e7af7e71f036a7144f5639cbfe
- affected 5.3
- unaffected < 5.3
- unaffected 5.15.181 – ≤ 5.15.*
- unaffected 6.1.120 – ≤ 6.1.*
- unaffected 6.6.64 – ≤ 6.6.*
- unaffected 6.11.11 – ≤ 6.11.*
- unaffected 6.12.2 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References7
- https://git.kernel.org/stable/c/77aa9855a878fb43f547ddfbda3127a1e88ad31a (opens in a new tab)
- https://git.kernel.org/stable/c/b2f26a27ea3f72f75d18330f76f5d1007c791848 (opens in a new tab)
- https://git.kernel.org/stable/c/43e25adc80269f917d2a195f0d59f74cdd182955 (opens in a new tab)
- https://git.kernel.org/stable/c/a3c3f8a4d025acc8c857246ec2b812c59102487a (opens in a new tab)
- https://git.kernel.org/stable/c/0e4c6faaef8a24b762a24ffb767280e263ef8e10 (opens in a new tab)
- https://git.kernel.org/stable/c/eb02688c5c45c3e7af7e71f036a7144f5639cbfe (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (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-2024-53394 (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-2024-56751)Record last updated .