CVE-2026-31580bcache: fix cached_dev.sb_bio use-after-free and crash
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 46 days later
· 46 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 81f44ed8c3f54abb7561ece774ea4cca5070b2f2
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < f50e7c325ab1207fe941555bcff659f6d7050572
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < add4982510f3b7c318a2dd7438bdc9c63171e753
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 2d6965581e164fa2ba3f7652ddae5535f6336576
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 4f71c8ba2dc009042493021d94a9718fbe2ebf27
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9
- affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 – < fec114a98b8735ee89c75216c45a78e28be0f128
- affected 3.10
- unaffected < 3.10
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.136 – ≤ 6.6.*
- unaffected 6.12.83 – ≤ 6.12.*
- unaffected 6.18.24 – ≤ 6.18.*
- unaffected 6.19.14 – ≤ 6.19.*
- unaffected 7.0.1 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References10
- https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2 (opens in a new tab)
- https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572 (opens in a new tab)
- https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 (opens in a new tab)
- https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 (opens in a new tab)
- https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753 (opens in a new tab)
- https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576 (opens in a new tab)
- https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27 (opens in a new tab)
- https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 (opens in a new tab)
- https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-25473 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-31580)Record last updated .