{"cve":"CVE-2026-31580","nvd":{"published":"2026-04-24T15:16:32.683","modified":"2026-10-15T02:19:11.713","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452]  blk_update_request+0x14e/0x370\n[6888366.280561]  blk_mq_end_request+0x1a/0x130\n[6888366.280671]  rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792]  rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903]  __complete_request+0x22/0x70 [libceph]\n[6888366.281032]  osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164]  ? inet_recvmsg+0x5b/0xd0\n[6888366.281272]  ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405]  ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534]  ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661]  ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime.  If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576","https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9","https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1","https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27","https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-31580","score":0.00131,"percentile":0.02694,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}