CVE-2025-39880

Summary

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

libceph: fix invalid accesses to ceph_connection_v1_info

There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use).

On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and successive fetching of new tickets.

con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < ea12ab684f8ae8a6da11a22c78d94a79e2163096affected
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < 591ea9c30737663a471b2bb07b27ddde86b020d5affected
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8affected
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983affected
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < 6bd8b56899be0b514945f639a89ccafb8f8dfaefaffected
LinuxLinuxcd1a677cad994021b19665ed476aea63f5d54f31 < cdbc9836c7afadad68f374791738f118263c5371affected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux5.15.194 <= 5.15.*unaffected
LinuxLinux6.1.153 <= 6.1.*unaffected
LinuxLinux6.6.107 <= 6.6.*unaffected
LinuxLinux6.12.48 <= 6.12.*unaffected
LinuxLinux6.16.8 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References