exec: don't WARN for racy path_noexec check
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- Fix
- Fixed in 5.10.229, 5.15.170, 6.1.115, 6.6.59
- 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: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: exec: don't WARN for racy path_noexec check Both i_mode and noexec checks wrapped in WARN_ON stem from an artifact of the previous implementation. They used to legitimately check for the condition, but that got moved up in two commits: 633fb6ac3980 ("exec: move S_ISREG() check earlier") 0fd338b2d2cd ("exec: move path_noexec() check earlier") Instead of being removed said checks are WARN_ON'ed instead, which has some debug value. However, the spurious path_noexec check is racy, resulting in unwarranted warnings should someone race with setting the noexec flag. One can note there is more to perm-checking whether execve is allowed and none of the conditions are guaranteed to still hold after they were tested for. Additionally this does not validate whether the code path did any perm checking to begin with -- it will pass if the inode happens to be regular. Keep the redundant path_noexec() check even though it's mindless nonsense checking for guarantee that isn't given so drop the WARN. Reword the commentary and do small tidy ups while here. [brauner: keep redundant path_noexec() check]
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 0fd338b2d2cdf827091ae819ae90ad760b94ad0c · fixed in c9b77438077d5a20c79ead95bcdaf9bd4797baaf; From 0fd338b2d2cdf827091ae819ae90ad760b94ad0c · fixed in b723f96407a0a078cf75970e4dbf16b46d286a61; From 0fd338b2d2cdf827091ae819ae90ad760b94ad0c · fixed in 0bdf77be2330062b3a64f2bec39f62ab874a6796; From 0fd338b2d2cdf827091ae819ae90ad760b94ad0c · fixed in 0d16f53c91111cec914f0811fcc526a2ba77b20d; From 0fd338b2d2cdf827091ae819ae90ad760b94ad0c · fixed in 0d196e7589cefe207d5d41f37a0a28a1fdeeb7c6
- Linux Linux
5.9
- KernelLinux
From 5.9.0 · fixed in 5.10.229; From 5.11.0 · fixed in 5.15.170; From 5.16.0 · fixed in 6.1.115; From 6.2.0 · fixed in 6.6.59