tracing: Fix potential double free in create_var_ref()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix potential double free in create_var_ref() In create_var_ref(), init_var_ref() is called to initialize the fields of variable ref_field, which is allocated in the previous function call to create_hist_field(). Function init_var_ref() allocates the corresponding fields such as ref_field->system, but frees these fields when the function encounters an error. The caller later calls destroy_hist_field() to conduct error handling, which frees the fields and the variable itself. This results in double free of the fields which are already freed in the previous function. Fix this by storing NULL to the corresponding fields when they are freed in init_var_ref().
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
4.17
References 7
git.kernel.org
- stable/c/f8b383f83cb573152c577eca1ef101e89995b72a
- stable/c/c27f744ceefadc7bbeb14233b6abc150ced617d2
- stable/c/058cb6d86b9789377216c936506b346aaa1eb581
- stable/c/37443b3508b8cce6832f8d25cb4550b2f7801f50
- stable/c/4fdfb15e08598711dbf50daf56a33965232daf0e
- stable/c/bd83ff3bbfb003832481c9bff999d12385f396ae
- stable/c/99696a2592bca641eb88cc9a80c90e591afebd0f