High 7.8Published Apr 24, 2026

CVE-2026-31580bcache: fix cached_dev.sb_bio use-after-free and crash

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 81f44ed8c3f54abb7561ece774ea4cca5070b2f2; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before f50e7c325ab1207fe941555bcff659f6d7050572; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before add4982510f3b7c318a2dd7438bdc9c63171e753; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 2d6965581e164fa2ba3f7652ddae5535f6336576; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 4f71c8ba2dc009042493021d94a9718fbe2ebf27; from cafe563591446cf80bfbc2fe3bc72a2e36cf1060 before 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9; and 1 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	before 6.6.136; from 6.12 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2
https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572
https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85
https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1	patch
https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753	patch
https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576	patch
https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27	patch
https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9	patch
https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.