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

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Summary

CVECVE-2026-31580
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:32 UTC
Updated2026-06-01 17:16:48 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 81f44ed8c3f54abb7561ece774ea4cca5070b2f2 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 f50e7c325ab1207fe941555bcff659f6d7050572 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 add4982510f3b7c318a2dd7438bdc9c63171e753 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 2d6965581e164fa2ba3f7652ddae5535f6336576 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 4f71c8ba2dc009042493021d94a9718fbe2ebf27 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 git Not specified
CNA Linux Linux affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 fec114a98b8735ee89c75216c45a78e28be0f128 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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