7.3

CVE-2026-72019: linux Out-of-bounds Read

CVSS: 7.3v3.1HighReceived
AliasesUBUNTU-CVE-2026-72019DEBIAN-CVE-2026-72019
Published 15-08-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-72019 is a high (CVSS 7.3) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 25
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1SUSE-SU-2026:24181-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < b6cec6187b8632423cd99a94fd5e5ba165fa2a33 | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < 3adea1b1c04b57e08a5c12a1f42483760581ce61 | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < dc9ffa1905e72f026d080880a2e4cfc42aa91000 | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < f21fa533a3ed15ada74106aac4b9ddd078fc6b7a | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < e17a42199824973cd8212e95b21ffadf4114a21b | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < 2cf10d042562283ff4ae97c02d0993d4f1b5ea29 | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < c39087ad0b97fc11a3b058dfc8db9fd370762cb9 | ≥ c09440f7dcb304002dfced8c0fea289eb25f2da0, < f5089008f90c0a7c5520dff3934e0af00adf322d | 4.6

3 vendors · 170 products

References

27 links
Show all 27 references