CVE-2026-31580 (GCVE-0-2026-31580)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
bcache: fix cached_dev.sb_bio use-after-free and crash
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < add4982510f3b7c318a2dd7438bdc9c63171e753 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2d6965581e164fa2ba3f7652ddae5535f6336576 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4f71c8ba2dc009042493021d94a9718fbe2ebf27 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/bcache/super.c"
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              "version": "6.12.83",
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              "version": "6.19.14",
              "versionType": "semver"
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              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "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-\u003esb_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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:10.874Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753"
        },
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          "url": "https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27"
        },
        {
          "url": "https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9"
        }
      ],
      "title": "bcache: fix cached_dev.sb_bio use-after-free and crash",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31580",
    "datePublished": "2026-04-24T14:42:10.874Z",
    "dateReserved": "2026-03-09T15:48:24.119Z",
    "dateUpdated": "2026-04-24T14:42:10.874Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-04-26",
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  }
}


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