CVE-2026-46234: linux Out-of-bounds Write
Vulnerability summary
CVE-2026-46234 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 51 · Related 51Timeline
- 28-05-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: vsock: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.
CVSS metrics
3 scores · 3 sources · 1 version- 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
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.05 pp
From 0.13% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu154 products
- linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded) | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded) | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < caf11dfea5233a69298a1c448bbf8d1639c80536 | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < 01ef69785dc3162f588a361ab770b1e312800188 | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < a998a7e250bf976539e05a00ec64a81292afecaa | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < 310da27932dd0afe7ce7456dfe1f0814c3301f41 | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160 | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < 0b68881501460c3761f196469e1e503218c5e536 | ≥ b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97, < d114bfdc9b76bf93b881e195b7ec957c14227bab | 5.5
- linux_kernel≥ 5.5, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.140 | ≥ 6.7, < 6.12.90 | ≥ 6.13, < 6.18.32 | ≥ 6.19, < 7.0.9
Debian1 product
- linux< 6.1.176-1 | < 6.12.90-1 | < 7.0.9-1
3 vendors · 157 products
