CVE-2026-64559: linux Out-of-bounds Read
CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-64559DEBIAN-CVE-2026-64559
Published 29-07-2026Last modified 19-10-2026
Vulnerability summary
CVE-2026-64559 is a high (CVSS 7.8) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.6% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 16 · Related 14Timeline
- 29-07-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.12% on 19-09-2026
19-09-202619-10-2026
EPSS score0.12%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu119 products
- linux< 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.12.100-1 | < 7.1.5-1
- linux-6.12< 6.12.100-1~deb12u1
Linux1 product
- linux≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 693bf91d4db134f9b1c2840c8e287eee3d993bac | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 7e7e03848c918aa0acad5ffd75d929e3afec1554 | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 | 6.12
3 vendors · 122 products
