In the Linux kernel, the following vulnerability has been resolved:
bcache: fixup btree_cache_wait list damage
We get a kernel crash about "list_add corruption. next->prev should be prev (ffff9c801bc01210), but was ffff9c77b688237c. (next=ffffae586d8afe68)."
crash> struct list_head 0xffff9c801bc01210 struct list_head { next = 0xffffae586d8afe68, prev = 0xffffae586d8afe68 } crash> struct list_head 0xffff9c77b688237c struct list_head { next = 0x0, prev = 0x0 } crash> struct list_head 0xffffae586d8afe68 struct list_head struct: invalid kernel virtual address: ffffae586d8afe68 type: "gdb_readmem_callback" Cannot access memory at address 0xffffae586d8afe68
[230469.019492] Call Trace: [230469.032041] prepare_to_wait+0x8a/0xb0 [230469.044363] ? bch_btree_keys_free+0x6c/0xc0 [escache] [230469.056533] mca_cannibalize_lock+0x72/0x90 [escache] [230469.068788] mca_alloc+0x2ae/0x450 [escache] [230469.080790] bch_btree_node_get+0x136/0x2d0 [escache] [230469.092681] bch_btree_check_thread+0x1e1/0x260 [escache] [230469.104382] ? finish_wait+0x80/0x80 [230469.115884] ? bch_btree_check_recurse+0x1a0/0x1a0 [escache] [230469.127259] kthread+0x112/0x130 [230469.138448] ? kthread_flush_work_fn+0x10/0x10 [230469.149477] ret_from_fork+0x35/0x40
bch_btree_check_thread() and bch_dirty_init_thread() may call mca_cannibalize() to cannibalize other cached btree nodes. Only one thread can do it at a time, so the op of other threads will be added to the btree_cache_wait list.
We must call finish_wait() to remove op from btree_cache_wait before free it's memory address. Otherwise, the list will be damaged. Also should call bch_cannibalize_unlock() to release the btree_cache_alloc_lock and wake_up other waiters.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-develUpgrade kernelUpgrade kernel-livepatch-5.15.122-77.145Upgrade kernel-headersUpgrade perf-debuginfoUpgrade python-perfUpgrade kernel-develUpgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade kernel-livepatch-5.10.192-182.736 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libs | Mar 10, 2026 | Mar 10, 2026 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-nvidiaUpgrade linux-xilinx-zynqmpUpgrade linux-gkeopUpgrade linux-gcpUpgrade linux-intel-iot-realtimeUpgrade linux-oracleUpgrade linux-intel-iotgUpgrade linux-nvidia-tegra-igxUpgrade linux-azureUpgrade linux-kvmUpgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-azure-5.15Upgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linuxUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-riscv-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-ibm-5.15Upgrade linux-gke | Jan 6, 2026 | Jan 2, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 30, 2025 |
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