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In the Linux kernel, the following vulnerability has been resolved:
powerpc/xive/spapr: correct bitmap allocation size
kasan detects access beyond the end of the xibm->bitmap allocation:
BUG: KASAN: slab-out-of-bounds in _find_first_zero_bit+0x40/0x140 Read of size 8 at addr c00000001d1d0118 by task swapper/0/1
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-rc2-00001-g90df023b36dd #28 Call Trace: [c00000001d98f770] [c0000000012baab8] dump_stack_lvl+0xac/0x108 (unreliable) [c00000001d98f7b0] [c00000000068faac] print_report+0x37c/0x710 [c00000001d98f880] [c0000000006902c0] kasan_report+0x110/0x354 [c00000001d98f950] [c000000000692324] __asan_load8+0xa4/0xe0 [c00000001d98f970] [c0000000011c6ed0] _find_first_zero_bit+0x40/0x140 [c00000001d98f9b0] [c0000000000dbfbc] xive_spapr_get_ipi+0xcc/0x260 [c00000001d98fa70] [c0000000000d6d28] xive_setup_cpu_ipi+0x1e8/0x450 [c00000001d98fb30] [c000000004032a20] pSeries_smp_probe+0x5c/0x118 [c00000001d98fb60] [c000000004018b44] smp_prepare_cpus+0x944/0x9ac [c00000001d98fc90] [c000000004009f9c] kernel_init_freeable+0x2d4/0x640 [c00000001d98fd90] [c0000000000131e8] kernel_init+0x28/0x1d0 [c00000001d98fe10] [c00000000000cd54] ret_from_kernel_thread+0x5c/0x64
Allocated by task 0: kasan_save_stack+0x34/0x70 __kasan_kmalloc+0xb4/0xf0 __kmalloc+0x268/0x540 xive_spapr_init+0x4d0/0x77c pseries_init_irq+0x40/0x27c init_IRQ+0x44/0x84 start_kernel+0x2a4/0x538 start_here_common+0x1c/0x20
The buggy address belongs to the object at c00000001d1d0118 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of 8-byte region [c00000001d1d0118, c00000001d1d0120)
The buggy address belongs to the physical page: page:c00c000000074740 refcount:1 mapcount:0 mapping:0000000000000000 index:0xc00000001d1d0558 pfn:0x1d1d flags: 0x7ffff000000200(slab|node=0|zone=0|lastcpupid=0x7ffff) raw: 007ffff000000200 c00000001d0003c8 c00000001d0003c8 c00000001d010480 raw: c00000001d1d0558 0000000001e1000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: c00000001d1d0000: fc 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc c00000001d1d0080: fc fc 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >c00000001d1d0100: fc fc fc 02 fc fc fc fc fc fc fc fc fc fc fc fc ^ c00000001d1d0180: fc fc fc fc 04 fc fc fc fc fc fc fc fc fc fc fc c00000001d1d0200: fc fc fc fc fc 04 fc fc fc fc fc fc fc fc fc fc
This happens because the allocation uses the wrong unit (bits) when it should pass (BITS_TO_LONGS(count) * sizeof(long)) or equivalent. With small numbers of bits, the allocated object can be smaller than sizeof(long), which results in invalid accesses.
Use bitmap_zalloc() to allocate and initialize the irq bitmap, paired with bitmap_free() for consistency.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-64k-modules-coreUpgrade kernel-modules-extraUpgrade kernel-rt-64k-debug-modules-coreUpgrade kernel-64k-debug-modules-coreUpgrade kernel-debugUpgrade kernel-64k-modules-extraUpgrade libperfUpgrade kernel-64k-devel-matchedUpgrade perfUpgrade kernel-abi-stablelistsUpgrade kernel-zfcpdumpUpgrade kernel-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-modulesUpgrade kernel-zfcpdump-develUpgrade python3-perfUpgrade kernel-rt-64k-modulesUpgrade kernel-64k-develUpgrade kernel-devel-matchedUpgrade kernel-rt-64k-modules-extraUpgrade rtlaUpgrade kernel-rt-modulesUpgrade kernel-uki-virtUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-debug-coreUpgrade kernel-modules-coreUpgrade kernel-headersUpgrade kernel-debug-develUpgrade kernel-rt-debug-develUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-devel-matchedUpgrade kernel-rt-64k-debug-modulesUpgrade kernel-docUpgrade kernel-rtUpgrade kernel-develUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-coreUpgrade kernel-64k-debug-coreUpgrade kernel-tools-libsUpgrade kernel-rt-develUpgrade kernel-debug-modulesUpgrade kernel-rt-modules-coreUpgrade kernel-64k-modulesUpgrade kernel-64k-debug-modulesUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-64k-debug-modules-extraUpgrade kernel-rt-64k-develUpgrade kernel-debug-uki-virtUpgrade kernel-64k-debug-develUpgrade kernel-debug-modules-coreUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-rt-modules-extraUpgrade kernel-uki-virt-addonsUpgrade kernelUpgrade kernel-rt-64kUpgrade kernel-64k-debugUpgrade kernel-cross-headersUpgrade kernel-rt-debugUpgrade kernel-rt-64k-modules-coreUpgrade kernel-rt-64k-debugUpgrade kernel-rt-64k-coreUpgrade kernel-rt-64k-debug-coreUpgrade kernel-64kUpgrade kernel-toolsUpgrade kernel-debug-modules-extraUpgrade rvUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-64k-coreUpgrade kernel-rt-64k-debug-develUpgrade kernel-tools-libs-devel | Nov 20, 2025 | Nov 11, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Oracle_linux | — | Upgrade kernel | Nov 28, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | Jul 9, 2025 | Feb 26, 2025 |
| Rocky_linux | — | Upgrade kernel-rt-debug-coreUpgrade kernel-zfcpdump-coreUpgrade kernel-devel-matchedUpgrade kernel-tools-libsUpgrade kernel-zfcpdump-modulesUpgrade kernel-debuginfo-common-s390xUpgrade kernel-rt-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdumpUpgrade libperfUpgrade kernel-debug-modules-coreUpgrade kernel-zfcpdump-modules-coreUpgrade rvUpgrade kernel-rt-debug-develUpgrade kernel-uki-virt-addonsUpgrade kernel-zfcpdump-develUpgrade kernel-rt-modules-extraUpgrade kernel-toolsUpgrade kernel-rt-debug-modulesUpgrade kernel-modules-coreUpgrade kernel-debug-devel-matchedUpgrade kernelUpgrade kernel-rt-modules-coreUpgrade kernel-debug-debuginfoUpgrade kernel-modulesUpgrade libperf-debuginfoUpgrade kernel-tools-libs-develUpgrade kernel-rt-debug-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-rtUpgrade kernel-rt-debug-modules-coreUpgrade kernel-develUpgrade kernel-rt-debug-modules-extraUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-debug-coreUpgrade rtlaUpgrade python3-perfUpgrade kernel-rt-coreUpgrade kernel-debuginfoUpgrade kernel-rt-modulesUpgrade kernel-rt-develUpgrade kernel-debug-uki-virtUpgrade perf-debuginfoUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-uki-virtUpgrade kernel-debugUpgrade perfUpgrade kernel-modules-extraUpgrade kernel-rt-debugUpgrade python3-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-debug-develUpgrade kernel-core | Feb 5, 2026 | Nov 21, 2025 |
| Ubuntu | — | Upgrade linux-ibmUpgrade linux-gcpUpgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-azure-fdeUpgrade linux-azure-fde-5.15Upgrade linux-azureUpgrade linux-oracle-5.15Upgrade linux-nvidiaUpgrade linuxUpgrade linux-hwe-5.15Upgrade linux-oracleUpgrade linux-gkeopUpgrade linux-lowlatency-hwe-5.15Upgrade linux-lowlatencyUpgrade linux-aws-5.15Upgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-gkeUpgrade linux-raspi | Mar 19, 2025 | Feb 26, 2025 |
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