Ubuntu Linux 6.8/6.17/7.0 AppArmor SAUCE OOB Heap Read via buffer size miscalc
CVE-2026-47333 Published on May 28, 2026
Out-of-bounds read in Ubuntu Linux AppArmor notification handling
Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the size of an internal buffer, leading to a heap memory out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in invalid data being processed by the AppArmor DFA policy engine.
Vulnerability Analysis
CVE-2026-47333 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-47333
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Affected Versions
Canonical Ubuntu Linux:- Version 6.8.0 and below 6.8.0-124.124 is affected.
- Version 6.17.0 and below 6.17.0-35.35 is affected.
- Version 7.0.0 and below 7.0.0-22.22 is affected.