CVE-2026-43164

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().

syzbot reported null-ptr-deref of udp_sk(sk)->udp_prod_queue. [0]

Since the cited commit, udp_lib_init_sock() can fail, as can udp_init_sock() and udpv6_init_sock().

Let's handle the error in udplite_sk_init() and udplitev6_sk_init().

[0]: BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719 Read of size 4 at addr 0000000000000008 by task syz.2.18/2944

CPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 kasan_report+0xa2/0xe0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 instrument_atomic_read include/linux/instrumented.h:82 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719 __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline] udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906 udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064 ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438 ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489 NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318 ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500 NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6149 [inline] __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262 process_backlog+0x4d6/0x1160 net/core/dev.c:6614 __napi_poll+0xae/0x320 net/core/dev.c:7678 napi_poll net/core/dev.c:7741 [inline] net_rx_action+0x60d/0xdc0 net/core/dev.c:7893 handle_softirqs+0x209/0x8d0 kernel/softirq.c:622 do_softirq+0x52/0x90 kernel/softirq.c:523 __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline] __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246 ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984 udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442 udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469 udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe5/0x270 net/socket.c:742 __sys_sendto+0x3eb/0x580 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2209 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f67b4d9c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
36.4%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 13, 2026

Advisory Details (3)

Auto-updated May 13, 2026
No patch confirmed yet.
generic

udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f27030ac5bef47d997cfac05a3d188aa69f4df7f
generic

udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/470c7ca2b4c3e3a51feeb952b7f97a775b5c49cd
generic

udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0f13fa087ead642ea1eb5fdb6eb092c913ef06b7

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  3. 2026-06-21 01:59 UTCEPSS rescore
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  9. 2026-06-15 17:49 UTCEPSS rescore
  10. 2026-06-15 06:25 UTCEG score recompute
  11. 2026-06-15 06:25 UTCGHSA enrichment
  12. 2026-06-14 18:54 UTCEG score recompute
  13. 2026-06-14 18:54 UTCGHSA enrichment
  14. 2026-06-14 07:38 UTCEG score recompute
  15. 2026-06-14 07:38 UTCGHSA enrichment
  16. 2026-06-13 23:00 UTCEPSS rescore
  17. 2026-06-13 00:35 UTCEG score recompute
  18. 2026-06-13 00:35 UTCGHSA enrichment
  19. 2026-06-12 23:12 UTCEPSS rescore
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  21. 2026-06-12 07:30 UTCEG score recompute
  22. 2026-06-12 07:30 UTCGHSA enrichment
  23. 2026-06-11 20:11 UTCEG score recompute
  24. 2026-06-11 20:11 UTCGHSA enrichment
  25. 2026-06-11 14:00 UTCEPSS rescore
  26. 2026-06-11 08:55 UTCEG score recompute
  27. 2026-06-11 08:54 UTCGHSA enrichment
  28. 2026-06-10 22:18 UTCEPSS rescore
  29. 2026-06-10 21:37 UTCEG score recompute
  30. 2026-06-10 21:37 UTCGHSA enrichment
  31. 2026-06-10 13:22 UTCEPSS rescore
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  33. 2026-06-10 10:20 UTCEG score recompute
  34. 2026-06-10 10:20 UTCGHSA enrichment
  35. 2026-06-09 23:03 UTCEG score recompute
  36. 2026-06-09 23:03 UTCGHSA enrichment
  37. 2026-06-09 09:39 UTCEG score recompute
  38. 2026-06-09 09:39 UTCGHSA enrichment
  39. 2026-06-08 22:20 UTCEG score recompute
  40. 2026-06-08 22:20 UTCGHSA enrichment
  41. 2026-06-08 14:17 UTCEPSS rescore
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  43. 2026-06-08 11:02 UTCEG score recompute
  44. 2026-06-08 11:02 UTCGHSA enrichment
  45. 2026-06-07 23:44 UTCEG score recompute
  46. 2026-06-07 23:44 UTCGHSA enrichment
  47. 2026-06-07 15:25 UTCEPSS rescore
  48. 2026-06-07 15:25 UTCEPSS rescore
  49. 2026-06-07 12:27 UTCEG score recompute
  50. 2026-06-07 12:27 UTCGHSA enrichment
  51. 2026-06-07 01:11 UTCEG score recompute
  52. 2026-06-07 01:11 UTCGHSA enrichment
  53. 2026-06-06 13:54 UTCEG score recompute
  54. 2026-06-06 13:54 UTCGHSA enrichment
  55. 2026-06-06 13:47 UTCEPSS rescore
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  57. 2026-06-06 02:37 UTCEG score recompute
  58. 2026-06-06 02:37 UTCGHSA enrichment
  59. 2026-06-05 22:47 UTCEPSS rescore
  60. 2026-06-05 15:17 UTCEG score recompute
  61. 2026-06-05 15:17 UTCGHSA enrichment
  62. 2026-06-05 06:10 UTCEPSS rescore
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  64. 2026-06-05 04:00 UTCEG score recompute
  65. 2026-06-05 04:00 UTCGHSA enrichment
  66. 2026-06-04 16:41 UTCEG score recompute
  67. 2026-06-04 16:41 UTCGHSA enrichment
  68. 2026-06-04 05:23 UTCEG score recompute
  69. 2026-06-04 05:23 UTCGHSA enrichment
  70. 2026-06-03 18:06 UTCEG score recompute
  71. 2026-06-03 18:06 UTCGHSA enrichment
  72. 2026-06-03 06:49 UTCEG score recompute
  73. 2026-06-03 06:49 UTCGHSA enrichment
  74. 2026-06-02 20:13 UTCEPSS rescore
  75. 2026-06-02 19:30 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-43164?
CVE-2026-43164 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: udplite: Fix null-ptr-deref in udpenqueueschedule_skb(). syzbot reported null-ptr-deref of udpsk(sk)->udpprod_queue. [0] Since the cited commit, udplibinit_sock() can fail, as can udpinitsock() and udpv6initsock(). Let's handle the…
When was CVE-2026-43164 disclosed?
CVE-2026-43164 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43164 actively exploited?
CVE-2026-43164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43164?
CVE-2026-43164 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-43164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43164, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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