Answer in brief
CVE-2026-31580 records a Unknown severity vulnerability in bcache: fix cached_dev.sb_bio use-after-free and crash. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <81f44ed8c3f54abb7561ece774ea4cca5070b2f2 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <f50e7c325ab1207fe941555bcff659f6d7050572 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <add4982510f3b7c318a2dd7438bdc9c63171e753 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <2d6965581e164fa2ba3f7652ddae5535f6336576 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <4f71c8ba2dc009042493021d94a9718fbe2ebf27 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 || >=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <fec114a98b8735ee89c75216c45a78e28be0f128 | 81f44ed8c3f54abb7561ece774ea4cca5070b2f2, f50e7c325ab1207fe941555bcff659f6d7050572, 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85, 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1, add4982510f3b7c318a2dd7438bdc9c63171e753, 2d6965581e164fa2ba3f7652ddae5535f6336576, 4f71c8ba2dc009042493021d94a9718fbe2ebf27, 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9, fec114a98b8735ee89c75216c45a78e28be0f128 |
| Linux/Linuxgeneric | 3.10 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.