CVE-2024-50010

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]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0fd338b2d2cdf827091ae819ae90ad760b94ad0c < c9b77438077d5a20c79ead95bcdaf9bd4797baafaffected
LinuxLinux0fd338b2d2cdf827091ae819ae90ad760b94ad0c < b723f96407a0a078cf75970e4dbf16b46d286a61affected
LinuxLinux0fd338b2d2cdf827091ae819ae90ad760b94ad0c < 0bdf77be2330062b3a64f2bec39f62ab874a6796affected
LinuxLinux0fd338b2d2cdf827091ae819ae90ad760b94ad0c < 0d16f53c91111cec914f0811fcc526a2ba77b20daffected
LinuxLinux0fd338b2d2cdf827091ae819ae90ad760b94ad0c < 0d196e7589cefe207d5d41f37a0a28a1fdeeb7c6affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.229 <= 5.10.*unaffected
LinuxLinux5.15.170 <= 5.15.*unaffected
LinuxLinux6.1.115 <= 6.1.*unaffected
LinuxLinux6.6.59 <= 6.6.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References