CVE-2026-31580
HighCVSS 7.8Summary
W jądrze systemu Linux zidentyfikowano podatność związana z używaniem po zwolnieniu pamięci (use-after-free) w module bcache, co prowadzi do awarii. Problem dotyczy struktury cached_dev, która może być zwolniona podczas zapisu do superbloku, co skutkuje dostępem do zwolnionego adresu.
Risk Assessment
Podatność ta może prowadzić do awarii systemu, co w konsekwencji może wpłynąć na dostępność usług w środowisku produkcyjnym. W przypadku wykorzystania tej luki, atakujący może spowodować niestabilność systemu.
Recommendation
Zaleca się zastosowanie najnowszych poprawek do jądra Linux, które rozwiązują ten problem. Należy również monitorować systemy pod kątem nieoczekiwanych awarii oraz analizować raporty o błędach.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bcache: fix cached_dev.sb_bio use-after-free and crash In our production environment, we have received multiple crash reports regarding libceph, which have caught our attention: ``` [6888366.280350] Call Trace: [6888366.280452] blk_update_request+0x14e/0x370 [6888366.280561] blk_mq_end_request+0x1a/0x130 [6888366.280671] rbd_img_handle_request+0x1a0/0x1b0 [rbd] [6888366.280792] rbd_obj_handle_request+0x32/0x40 [rbd] [6888366.280903] __complete_request+0x22/0x70 [libceph] [6888366.281032] osd_dispatch+0x15e/0xb40 [libceph] [6888366.281164] ? inet_recvmsg+0x5b/0xd0 [6888366.281272] ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph] [6888366.281405] ceph_con_process_message+0x79/0x140 [libceph] [6888366.281534] ceph_con_v1_try_read+0x5d7/0xf30 [libceph] [6888366.281661] ceph_con_workfn+0x329/0x680 [libceph] ``` After analyzing the coredump file, we found that the address of dc->sb_bio has been freed. We know that cached_dev is only freed when it is stopped. Since sb_bio is a part of struct cached_dev, rather than an alloc every time. If the device is stopped while writing to the superblock, the released address will be accessed at endio. This patch hopes to wait for sb_write to complete in cached_dev_free. It should be noted that we analyzed the cause of the problem, then tell all details to the QWEN and adopted the modifications it made.

