CVE-2026-52942

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-24. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

netfilter: nf_log: validate MAC header was set before dumping it

The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log.

This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed).

Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before.

BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 24, 2026

Last Modified

September 8, 2026

Advisory Details (7)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d704ee9c7bc68a161684c51a7ac05b446dcf38d4
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c38d41134085193efd5b237cf513ad5b3421a60d
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/befb8968a2abdfa948d5600ea7f7a509a292a590
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af1b7699466f6556b351fa25d3dc870abfb5d310
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a84b6fedbc97078788be78dbdd7517d143ad1a77
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8a81e336da685423f5b64aac4d571e63d674c52a
generic

netfilter: nf_log: validate MAC header was set before dumping it - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/65ef7397eb9a296e91839f5fd10be96f23d332e7

Vendor Advisories for CVE-2026-52942(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-08ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-08ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-08ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)5.10.262-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 89× 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 292 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 09:44 UTCEG score recompute
  5. 2026-09-08 09:44 UTCVendor advisory
  6. 2026-09-08 09:44 UTCGHSA enrichment
  7. 2026-09-08 08:59 UTCEG score recompute
  8. 2026-09-08 08:59 UTCVendor advisory
  9. 2026-09-08 08:59 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-30 20:21 UTCEG score recompute
  16. 2026-08-30 20:21 UTCVendor advisory
  17. 2026-08-30 20:21 UTCGHSA enrichment
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-28 04:52 UTCEG score recompute
  22. 2026-08-28 04:52 UTCVendor advisory
  23. 2026-08-28 04:52 UTCGHSA enrichment
  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-26 14:46 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-25 01:32 UTCEG score recompute
  3. 2026-08-25 01:32 UTCGHSA enrichment
  4. 2026-08-24 13:48 UTCEG score recompute
  5. 2026-08-24 13:48 UTCVendor advisory
  6. 2026-08-24 13:48 UTCGHSA enrichment
  7. 2026-08-24 00:33 UTCVendor advisory
  8. 2026-08-24 00:32 UTCGHSA enrichment
  9. 2026-08-23 12:48 UTCVendor advisory
  10. 2026-08-23 12:48 UTCGHSA enrichment
  11. 2026-08-23 01:03 UTCEG score recompute
  12. 2026-08-23 01:03 UTCVendor advisory
  13. 2026-08-23 01:03 UTCGHSA enrichment
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-22 13:19 UTCEG score recompute
  16. 2026-08-22 13:19 UTCVendor advisory
  17. 2026-08-22 13:19 UTCGHSA enrichment
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-21 19:07 UTCGHSA enrichment
  20. 2026-08-21 07:19 UTCEG score recompute
  21. 2026-08-21 07:19 UTCVendor advisory
  22. 2026-08-21 07:19 UTCGHSA enrichment
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 19:20 UTCVendor advisory
  25. 2026-08-20 19:20 UTCGHSA enrichment
  26. 2026-08-20 07:36 UTCEG score recompute
  27. 2026-08-20 07:36 UTCVendor advisory
  28. 2026-08-20 07:36 UTCGHSA enrichment
  29. 2026-08-19 17:04 UTCEPSS rescore
  30. 2026-08-19 14:17 UTCVendor advisory
  31. 2026-08-19 14:16 UTCGHSA enrichment
  32. 2026-08-19 02:22 UTCEG score recompute
  33. 2026-08-19 02:22 UTCVendor advisory
  34. 2026-08-19 02:21 UTCGHSA enrichment
  35. 2026-08-18 13:48 UTCEPSS rescore
  36. 2026-08-17 13:47 UTCEPSS rescore
  37. 2026-08-17 11:00 UTCVendor advisory
  38. 2026-08-17 11:00 UTCGHSA enrichment
  39. 2026-08-16 23:17 UTCEG score recompute
  40. 2026-08-16 23:17 UTCVendor advisory
  41. 2026-08-16 23:17 UTCGHSA enrichment
  42. 2026-08-16 14:56 UTCEPSS rescore
  43. 2026-08-16 11:32 UTCEG score recompute
  44. 2026-08-16 11:32 UTCVendor advisory
  45. 2026-08-16 11:32 UTCGHSA enrichment
  46. 2026-08-16 02:14 UTCEPSS rescore
  47. 2026-08-15 23:49 UTCVendor advisory
  48. 2026-08-15 23:49 UTCGHSA enrichment
  49. 2026-08-15 12:05 UTCEG score recompute
  50. 2026-08-15 12:05 UTCVendor advisory
  51. 2026-08-15 12:05 UTCGHSA enrichment
  52. 2026-08-15 01:30 UTCEPSS rescore
  53. 2026-08-15 00:20 UTCVendor advisory
  54. 2026-08-15 00:20 UTCGHSA enrichment
  55. 2026-08-14 12:37 UTCVendor advisory
  56. 2026-08-14 12:37 UTCGHSA enrichment
  57. 2026-08-14 00:53 UTCEG score recompute
  58. 2026-08-14 00:53 UTCVendor advisory
  59. 2026-08-14 00:53 UTCGHSA enrichment
  60. 2026-08-13 22:00 UTCEPSS rescore
  61. 2026-08-13 13:09 UTCVendor advisory
  62. 2026-08-13 13:09 UTCGHSA enrichment
  63. 2026-08-13 01:25 UTCEG score recompute
  64. 2026-08-13 01:25 UTCGHSA enrichment
  65. 2026-08-12 13:51 UTCEPSS rescore
  66. 2026-08-12 13:41 UTCVendor advisory
  67. 2026-08-12 13:41 UTCGHSA enrichment
  68. 2026-08-12 01:53 UTCVendor advisory
  69. 2026-08-12 01:53 UTCGHSA enrichment
  70. 2026-08-11 14:09 UTCEG score recompute
  71. 2026-08-11 14:09 UTCVendor advisory
  72. 2026-08-11 14:09 UTCGHSA enrichment
  73. 2026-08-11 02:25 UTCEG score recompute
  74. 2026-08-11 02:25 UTCVendor advisory
  75. 2026-08-11 02:25 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-52942?
CVE-2026-52942 is a high vulnerability published on June 24, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dumpmacheader() guards the MAC header access only with "skb->macheader != skb->networkheader", without checking skbmacheaderwasset(). When the…
When was CVE-2026-52942 disclosed?
CVE-2026-52942 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52942 actively exploited?
CVE-2026-52942 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.3% of all scored CVEs.
What is the CVSS score of CVE-2026-52942?
CVE-2026-52942 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-52942?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52942, 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.

Dependency Blast Radius

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