CVE-2024-26689

Summary

In the Linux kernel, the following vulnerability has been resolved:

ceph: prevent use-after-free in encode_cap_msg()

In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed.

In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it.

encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < 8180d0c27b93a6eb60da1b08ea079e3926328214affected
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < 70e329b440762390258a6fe8c0de93c9fdd56c77affected
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < f3f98d7d84b31828004545e29fd7262b9f444139affected
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < ae20db45e482303a20e56f2db667a9d9c54ac7e7affected
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < 7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcaffected
LinuxLinux9030aaf9bf0a1eee47a154c316c789e959638b0f < cda4672da1c26835dcbd7aec2bfed954eda9b5efaffected
LinuxLinux2.6.34affected
LinuxLinux0 < 2.6.34unaffected
LinuxLinux5.10.210 <= 5.10.*unaffected
LinuxLinux5.15.149 <= 5.15.*unaffected
LinuxLinux6.1.79 <= 6.1.*unaffected
LinuxLinux6.6.18 <= 6.6.*unaffected
LinuxLinux6.7.6 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References