libceph: make free_choose_arg_map() resilient to partial allocation

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation. For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer. To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.

Timeline

1. Jan 23, 2026, 3:24 PM UTCCVE published
2. Jun 16, 2026, 8:35 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 19, 2026, 6:25 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 9b3730dabcf3764bfe3ff07caf55e641a0b45234; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 851241d3f78a5505224dc21c03d8692f530256b4; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in ec1850f663da64842614c86b20fe734be070c2ba; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 8081faaf089db5280c3be820948469f7c58ef8dd; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in f21c3fdb96833aac2f533506899fe38c19cf49d5; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in e3fe30e57649c551757a02e1cad073c47e1e075e

• Linux Linux

  4.13

• KernelLinux

  From 4.13.0 · fixed in 5.10.248; From 5.11.0 · fixed in 5.15.198; From 5.16.0 · fixed in 6.1.161; From 6.2.0 · fixed in 6.6.121; From 6.7.0 · fixed in 6.12.66; From 6.13.0 · fixed in 6.18.6

References 7