CVE-2021-47357
atm: iphase: fix possible use-after-free in ia_module_exit()
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: atm: iphase: fix possible use-after-free in ia_module_exit() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.12
References 9
git.kernel.org
- stable/c/9e161687855175334ca93c6c3ccb221731194479
- stable/c/a832ee2f2145f57443b2d565f8cb5490e8339f42
- stable/c/bcdd2be48edd8c6867fb44112cb8d18086beae29
- stable/c/89ce0b0747f319eb70f85bc820dcc43cebbd5417
- stable/c/c9172498d4d62c9b64e5fb37c1ee0343e65fe51b
- stable/c/e759ff76ebbbfcdcf83b6634c54dc47828573d8b
- stable/c/b58d246a058ae88484758cd4ab27b3180fd5ecf8
- stable/c/d1fb12412874c94ad037e11d0ecdd1140a439297
- stable/c/1c72e6ab66b9598cac741ed397438a52065a8f1f