CVE-2026-31580

HIGH EPSS 2.8%
Published Apr 24, 20262mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel* <6.6.136
linuxlinux_kernel*≥6.12  –  <6.12.83
linuxlinux_kernel*≥6.13  –  <6.18.24
linuxlinux_kernel*≥6.19  –  <6.19.14
linuxlinux_kernel*≥7.0  –  <7.0.1

References 9

  • git.kernel.org https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2
  • git.kernel.org https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85
  • git.kernel.org https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572
  • git.kernel.org https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128
    Patch