Description
ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14 allows local users to achieve partial plaintext recovery (for a CBC based ciphersuite) via a cache-based side-channel attack.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14 | ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mbedtls | 2.12.0-1 | — |
| Debian 13 | mbedtls | 2.12.0-1 | — |
| Debian 12 | mbedtls | 2.12.0-1 | — |
| Debian 9 | mbedtls | 2.4.2-1+deb9u3 | DSA-4296-1 |
| Debian 8 | polarssl | 1.3.9-2.1+deb8u4 | DLA-1518-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mbedtls | 2.2.1-2ubuntu0.3 | USN-4267-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | mbedtls | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls +2 | 2.12.0-r0 | — |
| Alpine v3.23 | mbedtls +1 | 2.12.0-r0 | — |
| Alpine v3.22 | mbedtls +1 | 2.12.0-r0 | — |
| Alpine v3.21 | mbedtls +1 | 2.12.0-r0 | — |
| Alpine v3.20 | mbedtls +1 | 2.12.0-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.18 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.17 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.16 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.15 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.14 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.13 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.12 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.11 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.10 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.9 | mbedtls | 2.12.0-r0 | — |
| Alpine v3.8 | mbedtls | 2.7.5-r0 | — |
Advisories 3
- USN-4267-1 mbedtls vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4296-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1518-1 polarssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- [debian-lts-announce] 20180925 [SECURITY] [DLA 1518-1] polarssl security update mailing-list
- DSA-4296 vendor-advisory
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2018-02
- USN-4267-1 vendor-advisory