CVE-2026-31580— bcache: fix cached_dev.sb_bio use-after-free and crash
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I. Basic Information for CVE-2026-31580
Vulnerability Information
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Vulnerability Title
bcache: fix cached_dev.sb_bio use-after-free and crash
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于bcache中cached_dev.sb_bio释放后重用，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-31580
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Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total
| CVE-2026-31608 | 9.8 CRITICAL | smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list |
| CVE-2026-31609 | 9.8 CRITICAL | smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush() |
| CVE-2026-31657 | 9.8 CRITICAL | batman-adv: hold claim backbone gateways by reference |
| CVE-2026-31633 | 9.8 CRITICAL | rxrpc: Fix integer overflow in rxgk_verify_response() |
| CVE-2026-31607 | 9.8 CRITICAL | usbip: validate number_of_packets in usbip_pack_ret_submit() |
| CVE-2026-31669 | 9.8 CRITICAL | mptcp: fix slab-use-after-free in __inet_lookup_established |
| CVE-2026-31668 | 9.8 CRITICAL | seg6: separate dst_cache for input and output paths in seg6 lwtunnel |
| CVE-2026-31659 | 9.8 CRITICAL | batman-adv: reject oversized global TT response buffers |
| CVE-2026-31589 | 9.8 CRITICAL | mm: call ->free_folio() directly in folio_unmap_invalidate() |
| CVE-2026-31536 | 9.8 CRITICAL | smb: server: let send_done handle a completion without IB_SEND_SIGNALED |
| CVE-2026-31637 | 9.8 CRITICAL | rxrpc: reject undecryptable rxkad response tickets |
| CVE-2026-31649 | 9.8 CRITICAL | net: stmmac: fix integer underflow in chain mode |
| CVE-2026-31636 | 9.1 CRITICAL | rxrpc: fix RESPONSE authenticator parser OOB read |
| CVE-2026-31570 | 8.8 HIGH | can: gw: fix OOB heap access in cgw_csum_crc8_rel() |
| CVE-2026-31558 | 8.8 HIGH | LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust |
| CVE-2026-31629 | 8.8 HIGH | nfc: llcp: add missing return after LLCP_CLOSED checks |
| CVE-2026-31588 | 8.8 HIGH | KVM: x86: Use scratch field in MMIO fragment to hold small write values |
| CVE-2026-31553 | 8.8 HIGH | KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc() |
| CVE-2026-31622 | 8.8 HIGH | NFC: digital: Bounds check NFC-A cascade depth in SDD response handler |
| CVE-2026-31611 | 8.6 HIGH | ksmbd: require 3 sub-authorities before reading sub_auth[2] |
Showing top 20 of 138 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-31580
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