CVE-2026-74659: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-74659DEBIAN-CVE-2026-74659
Published 22-08-2026Last modified 22-08-2026
Open JSON

Vulnerability summary

CVE-2026-74659 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
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 9 · Related 8
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4640-1SUSE-SU-2026:4706-1USN-8875-1USN-8875-2

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mrp: fix uninitialised bytes on the wire br_mrp_alloc_test_skb() builds MRP test frames on an skb from dev_alloc_skb(), which does not clear the linear data area. On the MRA ring-role branch the sub-option TLV header is appended with sub_tlv = skb_put(skb, sizeof(*sub_tlv)); sub_tlv->type = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR; so sub_tlv->length is never written, and the two trailing alignment bytes are appended with a bare skb_put() that does not clear them either. The neighbouring oui and sub_opt regions are explicitly zeroed, so three uninitialised bytes are left in every MRA MRP_Test frame that goes out. Put the sub-option TLV header and the alignment padding in a single skb_put_zero(), which clears both. The AUTO_MGR sub-TLV carries no payload, so the zeroed length field is already the value it should have.

CVSS metrics

Risk metrics not yet published.

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 19-09-2026

19-09-202619-10-2026
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

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linux< 5.15.0-198.208 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1117.124 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < 014c062d23c63ec77ef2cf17a0d9363c7441cc94 | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < 7ebc23ff03668042e0b0e4034bb1518d36198d9e | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < 06d58b8d2f053ced82e01efaeb6e7c82891eed58 | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < a5e385eeb2d6dbbbdebfa050e67c34734ae12693 | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < 5912cf1822fbe53ae275c147868740eb384a5d3e | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < e08665218040f8e312abe40f74543186f3c2c941 | ≥ f7458934b0791c39a001e4d902fc3bf697b439b5, < 63488dba65ef91373ef616575b32eb0eb21459f4 | 5.14

3 vendors · 160 products

References

16 links
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