In the Linux kernel, the following vulnerability has been resolved:
mm: krealloc: Fix MTE false alarm in __do_krealloc
This patch addresses an issue introduced by commit 1a83a716ec233 ("mm: krealloc: consider spare memory for __GFP_ZERO") which causes MTE (Memory Tagging Extension) to falsely report a slab-out-of-bounds error.
The problem occurs when zeroing out spare memory in __do_krealloc. The original code only considered software-based KASAN and did not account for MTE. It does not reset the KASAN tag before calling memset, leading to a mismatch between the pointer tag and the memory tag, resulting in a false positive.
Example of the error: ================================================================== swapper/0: BUG: KASAN: slab-out-of-bounds in __memset+0x84/0x188 swapper/0: Write at addr f4ffff8005f0fdf0 by task swapper/0/1 swapper/0: Pointer tag: [f4], memory tag: [fe] swapper/0: swapper/0: CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12. swapper/0: Hardware name: MT6991(ENG) (DT) swapper/0: Call trace: swapper/0: dump_backtrace+0xfc/0x17c swapper/0: show_stack+0x18/0x28 swapper/0: dump_stack_lvl+0x40/0xa0 swapper/0: print_report+0x1b8/0x71c swapper/0: kasan_report+0xec/0x14c swapper/0: __do_kernel_fault+0x60/0x29c swapper/0: do_bad_area+0x30/0xdc swapper/0: do_tag_check_fault+0x20/0x34 swapper/0: do_mem_abort+0x58/0x104 swapper/0: el1_abort+0x3c/0x5c swapper/0: el1h_64_sync_handler+0x80/0xcc swapper/0: el1h_64_sync+0x68/0x6c swapper/0: __memset+0x84/0x188 swapper/0: btf_populate_kfunc_set+0x280/0x3d8 swapper/0: __register_btf_kfunc_id_set+0x43c/0x468 swapper/0: register_btf_kfunc_id_set+0x48/0x60 swapper/0: register_nf_nat_bpf+0x1c/0x40 swapper/0: nf_nat_init+0xc0/0x128 swapper/0: do_one_initcall+0x184/0x464 swapper/0: do_initcall_level+0xdc/0x1b0 swapper/0: do_initcalls+0x70/0xc0 swapper/0: do_basic_setup+0x1c/0x28 swapper/0: kernel_init_freeable+0x144/0x1b8 swapper/0: kernel_init+0x20/0x1a8 swapper/0: ret_from_fork+0x10/0x20 ==================================================================
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfoUpgrade perfUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.15.173-118.169Upgrade bpftoolUpgrade kernelUpgrade python-perf-debuginfoUpgrade python-perfUpgrade perf-debuginfoUpgrade kernel-livepatch-5.10.230-223.885Upgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64 | Mar 14, 2025 | Nov 25, 2024 |
| Amazon_linux_2023 | — | Upgrade kernel-tools-develUpgrade perfUpgrade kernel-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade kernel-modules-extraUpgrade kernel-libbpfUpgrade kernel-libbpf-staticUpgrade python3-perfUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernelUpgrade kernel-modules-extra-commonUpgrade kernel-livepatch-6.1.119-129.201Upgrade kernel-libbpf-develUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools | Mar 27, 2025 | Nov 25, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Dec 2, 2024 | Nov 25, 2024 |
| Oracle_linux | — | Upgrade kernel-uek | Dec 17, 2024 | Nov 25, 2024 |
| Redhat_linux | — | Upgrade kernel-rtNo solution existsUpgrade kernel | May 15, 2025 | Nov 25, 2024 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1044-xilinx-zynqmpUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.15.0-134-generic-lpaeUpgrade linux-image-5.15.0-1074-ibmUpgrade linux-image-azureUpgrade linux-image-awsUpgrade linux-image-gke-5.15Upgrade linux-image-raspi-nolpaeUpgrade linux-image-5.15.0-1021-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-1072-raspiUpgrade linux-image-5.15.0-1078-awsUpgrade linux-image-5.15.0-133-lowlatency-64kUpgrade linux-image-5.15.0-133-generic-64kUpgrade linux-image-aws-lts-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-5.15.0-133-lowlatencyUpgrade linux-image-5.15.0-1075-oracleUpgrade linux-image-5.15.0-1081-azure-fdeUpgrade linux-image-ibmUpgrade linux-image-5.15.0-134-genericUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-oracleUpgrade linux-image-azure-cvmUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-kvmUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-5.15.0-1075-gkeUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.15.0-1081-azureUpgrade linux-image-5.15.0-134-generic-64kUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-generic-lpaeUpgrade linux-image-raspiUpgrade linux-image-gkeop-5.15Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1060-gkeopUpgrade linux-image-lowlatencyUpgrade linux-image-oem-20.04bUpgrade linux-image-5.15.0-1080-awsUpgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-nvidiaUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-20.04Upgrade linux-image-gkeUpgrade linux-image-5.15.0-1072-nvidia-lowlatencyUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-gkeopUpgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-1073-intel-iotgUpgrade linux-image-intelUpgrade linux-image-5.15.0-1021-nvidia-tegra-igxUpgrade linux-image-oem-20.04cUpgrade linux-image-5.15.0-1070-ibmUpgrade linux-image-generic-64kUpgrade linux-image-5.15.0-1033-nvidia-tegra-rtUpgrade linux-image-azure-lts-22.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-5.15.0-133-genericUpgrade linux-image-5.15.0-1072-nvidiaUpgrade linux-image-5.15.0-1077-gcpUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.15.0-1033-nvidia-tegraUpgrade linux-image-genericUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-virtualUpgrade linux-image-gcpUpgrade linux-image-5.15.0-1076-kvmUpgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-133-generic-lpae | Feb 25, 2025 | Nov 25, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Nov 25, 2024 |
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