In the Linux kernel, the following vulnerability has been resolved:
bpf: Don't use tnum_range on array range checking for poke descriptors
Hsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which is based on a customized syzkaller:
BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0 Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489 CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x9c/0xc9 print_address_description.constprop.0+0x1f/0x1f0 ? bpf_int_jit_compile+0x1257/0x13f0 kasan_report.cold+0xeb/0x197 ? kvmalloc_node+0x170/0x200 ? bpf_int_jit_compile+0x1257/0x13f0 bpf_int_jit_compile+0x1257/0x13f0 ? arch_prepare_bpf_dispatcher+0xd0/0xd0 ? rcu_read_lock_sched_held+0x43/0x70 bpf_prog_select_runtime+0x3e8/0x640 ? bpf_obj_name_cpy+0x149/0x1b0 bpf_prog_load+0x102f/0x2220 ? __bpf_prog_put.constprop.0+0x220/0x220 ? find_held_lock+0x2c/0x110 ? __might_fault+0xd6/0x180 ? lock_downgrade+0x6e0/0x6e0 ? lock_is_held_type+0xa6/0x120 ? __might_fault+0x147/0x180 __sys_bpf+0x137b/0x6070 ? bpf_perf_link_attach+0x530/0x530 ? new_sync_read+0x600/0x600 ? __fget_files+0x255/0x450 ? lock_downgrade+0x6e0/0x6e0 ? fput+0x30/0x1a0 ? ksys_write+0x1a8/0x260 __x64_sys_bpf+0x7a/0xc0 ? syscall_enter_from_user_mode+0x21/0x70 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f917c4e2c2d
The problem here is that a range of tnum_range(0, map->max_entries - 1) has limited ability to represent the concrete tight range with the tnum as the set of resulting states from value + mask can result in a superset of the actual intended range, and as such a tnum_in(range, reg->var_off) check may yield true when it shouldn't, for example tnum_range(0, 2) would result in 00XX -> v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here represented by a less precise superset of {0, 1, 2, 3}. As the register is known const scalar, really just use the concrete reg->var_off.value for the upper index check.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-zfcpdump-coreUpgrade kernel-rt-modules-extraUpgrade kernel-rtUpgrade kernel-debug-modulesUpgrade bpftoolUpgrade kernel-tools-libs-develUpgrade kernel-rt-modulesUpgrade kernel-debug-modules-extraUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-coreUpgrade kernel-docUpgrade kernel-modules-extraUpgrade kernel-develUpgrade kernel-rt-debugUpgrade kernel-rt-develUpgrade kernel-rt-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-debugUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-modulesUpgrade kernel-debug-coreUpgrade kernel-debug-develUpgrade kernelUpgrade kernel-cross-headersUpgrade kernel-zfcpdumpUpgrade kernel-rt-debug-develUpgrade kernel-zfcpdump-develUpgrade perfUpgrade kernel-rt-debug-modules-extraUpgrade kernel-headersUpgrade kernel-rt-debug-modulesUpgrade kernel-core | Sep 10, 2025 | Sep 8, 2025 |
| Amazon Linux Ami 2 | — | Upgrade perfUpgrade kernelUpgrade python-perfUpgrade python-perf-debuginfoUpgrade kernel-livepatch-5.15.69-37.134Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-livepatch-5.10.144-127.601Upgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernelUpgrade kernel-abi-stablelists | Oct 24, 2025 | Oct 23, 2025 |
| Oracle_linux | — | Upgrade kernel | Sep 11, 2025 | Jun 18, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Jul 9, 2025 | Jun 18, 2025 |
| Rocky_linux | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-debug-debuginfoUpgrade perfUpgrade bpftool-debuginfoUpgrade kernel-develUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perf-debuginfoUpgrade kernel-tools-libs-develUpgrade kernel-coreUpgrade kernel-tools-debuginfoUpgrade kernel-debugUpgrade kernel-debug-develUpgrade kernel-debug-modulesUpgrade kernelUpgrade kernel-modules-extraUpgrade perf-debuginfoUpgrade kernel-debug-coreUpgrade kernel-debug-modules-extraUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-modules | Feb 5, 2026 | Oct 3, 2025 |
| Ubuntu | — | Upgrade linux-nvidiaUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-raspiUpgrade linux-riscv-5.15Upgrade linux-lowlatencyUpgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-oracle-5.15Upgrade linux-aws-5.15Upgrade linux-gkeopUpgrade linux-azure-fdeUpgrade linux-gkeUpgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-azureUpgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-gcp | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 18, 2025 |
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