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Linux Kernel: Memory Profiling Warning in Certain Environments
UBUNTU-CVE-2026-23219
Summary
A fix has been made to the Linux kernel to prevent a warning from appearing in memory profiling mode. This warning is not related to a security risk and does not affect the normal operation of the system, but it may be annoying to developers who have memory profiling enabled. No action is required to address this issue, as it has been resolved in the latest kernel update.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-aws-5.0 | All versions | – |
| canonical | linux-aws-5.3 | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-5.3 | All versions | – |
| canonical | linux-azure-edge | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-gcp-5.3 | All versions | – |
| canonical | linux-gke-4.15 | All versions | – |
| canonical | linux-gke-5.4 | All versions | – |
| canonical | linux-gkeop-5.4 | All versions | – |
| canonical | linux-hwe | All versions | – |
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-oem | All versions | – |
| canonical | linux-oracle-5.0 | All versions | – |
| canonical | linux-oracle-5.3 | All versions | – |
| canonical | linux-aws-5.11 | All versions | – |
| canonical | linux-aws-5.13 | All versions | – |
| canonical | linux-aws-5.8 | All versions | – |
| canonical | linux-azure-5.11 | All versions | – |
| canonical | linux-azure-5.13 | All versions | – |
| canonical | linux-azure-5.8 | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-gcp-5.11 | All versions | – |
| canonical | linux-gcp-5.13 | All versions | – |
| canonical | linux-gcp-5.8 | All versions | – |
| canonical | linux-gke | All versions | – |
| canonical | linux-gke-5.15 | All versions | – |
| canonical | linux-gkeop | All versions | – |
| canonical | linux-gkeop-5.15 | All versions | – |
| canonical | linux-hwe-5.11 | All versions | – |
| canonical | linux-hwe-5.13 | All versions | – |
| canonical | linux-hwe-5.8 | All versions | – |
| canonical | linux-intel-5.13 | All versions | – |
| canonical | linux-oem-5.10 | All versions | – |
| canonical | linux-oem-5.13 | All versions | – |
| canonical | linux-oem-5.14 | All versions | – |
| canonical | linux-oem-5.6 | All versions | – |
| canonical | linux-oracle-5.11 | All versions | – |
| canonical | linux-oracle-5.13 | All versions | – |
| canonical | linux-oracle-5.8 | All versions | – |
| canonical | linux-raspi2 | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.11 | All versions | – |
| canonical | linux-riscv-5.8 | All versions | – |
| canonical | linux-allwinner-5.19 | All versions | – |
| canonical | linux-aws-5.19 | All versions | – |
| canonical | linux-aws-6.2 | All versions | – |
| canonical | linux-aws-6.5 | All versions | – |
| canonical | linux-azure-5.19 | All versions | – |
| canonical | linux-azure-6.2 | All versions | – |
| canonical | linux-azure-6.5 | All versions | – |
| canonical | linux-azure-fde-5.19 | All versions | – |
| canonical | linux-azure-fde-6.2 | All versions | – |
| canonical | linux-gcp-5.19 | All versions | – |
| canonical | linux-gcp-6.2 | All versions | – |
| canonical | linux-gcp-6.5 | All versions | – |
| canonical | linux-hwe-5.19 | All versions | – |
| canonical | linux-hwe-6.2 | All versions | – |
| canonical | linux-hwe-6.5 | All versions | – |
| canonical | linux-intel-iot-realtime | All versions | – |
| canonical | linux-lowlatency-hwe-5.19 | All versions | – |
| canonical | linux-lowlatency-hwe-6.2 | All versions | – |
| canonical | linux-lowlatency-hwe-6.5 | All versions | – |
| canonical | linux-nvidia-6.2 | All versions | – |
| canonical | linux-nvidia-6.5 | All versions | – |
| canonical | linux-oem-5.17 | All versions | – |
| canonical | linux-oem-6.0 | All versions | – |
| canonical | linux-oem-6.1 | All versions | – |
| canonical | linux-oem-6.5 | All versions | – |
| canonical | linux-oracle-6.5 | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.19 | All versions | – |
| canonical | linux-riscv-6.5 | All versions | – |
| canonical | linux-starfive-5.19 | All versions | – |
| canonical | linux-starfive-6.2 | All versions | – |
| canonical | linux-starfive-6.5 | All versions | – |
| canonical | linux-aws-6.14 | All versions | – |
| canonical | linux-aws-6.17 | All versions | – |
| canonical | linux-azure-6.11 | All versions | – |
| canonical | linux-azure-6.14 | All versions | – |
| canonical | linux-azure-6.17 | All versions | – |
| canonical | linux-azure-fde-6.14 | All versions | – |
| canonical | linux-azure-fde-6.17 | All versions | – |
| canonical | linux-azure-nvidia-6.14 | All versions | – |
| canonical | linux-gcp-6.11 | All versions | – |
| canonical | linux-gcp-6.14 | All versions | – |
| canonical | linux-gcp-6.17 | All versions | – |
| canonical | linux-hwe-6.11 | All versions | – |
| canonical | linux-hwe-6.14 | All versions | – |
| canonical | linux-hwe-6.17 | All versions | – |
| canonical | linux-lowlatency-hwe-6.11 | All versions | – |
| canonical | linux-nvidia-6.11 | All versions | – |
| canonical | linux-oem-6.11 | All versions | – |
| canonical | linux-oem-6.14 | All versions | – |
| canonical | linux-oem-6.17 | All versions | – |
| canonical | linux-oem-6.8 | All versions | – |
| canonical | linux-oracle-6.14 | All versions | – |
| canonical | linux-oracle-6.17 | All versions | – |
| canonical | linux-raspi-realtime | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-6.14 | All versions | – |
| canonical | linux-riscv-6.17 | All versions | – |
| canonical | linux-realtime-6.14 | All versions | – |
| canonical | linux | All versions | – |
| canonical | linux-aws | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-oracle | All versions | – |
| canonical | linux-raspi | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
Original title
In the Linux kernel, the following vulnerability has been resolved: mm/slab: Add alloc_tagging_slab_free_hook for memcg_alloc_abort_single When CONFIG_MEM_ALLOC_PROFILING_DEBUG is enabled, the foll...
Original description
In the Linux kernel, the following vulnerability has been resolved: mm/slab: Add alloc_tagging_slab_free_hook for memcg_alloc_abort_single When CONFIG_MEM_ALLOC_PROFILING_DEBUG is enabled, the following warning may be noticed: [ 3959.023862] ------------[ cut here ]------------ [ 3959.023891] alloc_tag was not cleared (got tag for lib/xarray.c:378) [ 3959.023947] WARNING: ./include/linux/alloc_tag.h:155 at alloc_tag_add+0x128/0x178, CPU#6: mkfs.ntfs/113998 [ 3959.023978] Modules linked in: dns_resolver tun brd overlay exfat btrfs blake2b libblake2b xor xor_neon raid6_pq loop sctp ip6_udp_tunnel udp_tunnel ext4 crc16 mbcache jbd2 rfkill sunrpc vfat fat sg fuse nfnetlink sr_mod virtio_gpu cdrom drm_client_lib virtio_dma_buf drm_shmem_helper drm_kms_helper ghash_ce drm sm4 backlight virtio_net net_failover virtio_scsi failover virtio_console virtio_blk virtio_mmio dm_mirror dm_region_hash dm_log dm_multipath dm_mod i2c_dev aes_neon_bs aes_ce_blk [last unloaded: hwpoison_inject] [ 3959.024170] CPU: 6 UID: 0 PID: 113998 Comm: mkfs.ntfs Kdump: loaded Tainted: G W 6.19.0-rc7+ #7 PREEMPT(voluntary) [ 3959.024182] Tainted: [W]=WARN [ 3959.024186] Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022 [ 3959.024192] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 3959.024199] pc : alloc_tag_add+0x128/0x178 [ 3959.024207] lr : alloc_tag_add+0x128/0x178 [ 3959.024214] sp : ffff80008b696d60 [ 3959.024219] x29: ffff80008b696d60 x28: 0000000000000000 x27: 0000000000000240 [ 3959.024232] x26: 0000000000000000 x25: 0000000000000240 x24: ffff800085d17860 [ 3959.024245] x23: 0000000000402800 x22: ffff0000c0012dc0 x21: 00000000000002d0 [ 3959.024257] x20: ffff0000e6ef3318 x19: ffff800085ae0410 x18: 0000000000000000 [ 3959.024269] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 3959.024281] x14: 0000000000000000 x13: 0000000000000001 x12: ffff600064101293 [ 3959.024292] x11: 1fffe00064101292 x10: ffff600064101292 x9 : dfff800000000000 [ 3959.024305] x8 : 00009fff9befed6e x7 : ffff000320809493 x6 : 0000000000000001 [ 3959.024316] x5 : ffff000320809490 x4 : ffff600064101293 x3 : ffff800080691838 [ 3959.024328] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000d5bcd640 [ 3959.024340] Call trace: [ 3959.024346] alloc_tag_add+0x128/0x178 (P) [ 3959.024355] __alloc_tagging_slab_alloc_hook+0x11c/0x1a8 [ 3959.024362] kmem_cache_alloc_lru_noprof+0x1b8/0x5e8 [ 3959.024369] xas_alloc+0x304/0x4f0 [ 3959.024381] xas_create+0x1e0/0x4a0 [ 3959.024388] xas_store+0x68/0xda8 [ 3959.024395] __filemap_add_folio+0x5b0/0xbd8 [ 3959.024409] filemap_add_folio+0x16c/0x7e0 [ 3959.024416] __filemap_get_folio_mpol+0x2dc/0x9e8 [ 3959.024424] iomap_get_folio+0xfc/0x180 [ 3959.024435] __iomap_get_folio+0x2f8/0x4b8 [ 3959.024441] iomap_write_begin+0x198/0xc18 [ 3959.024448] iomap_write_iter+0x2ec/0x8f8 [ 3959.024454] iomap_file_buffered_write+0x19c/0x290 [ 3959.024461] blkdev_write_iter+0x38c/0x978 [ 3959.024470] vfs_write+0x4d4/0x928 [ 3959.024482] ksys_write+0xfc/0x1f8 [ 3959.024489] __arm64_sys_write+0x74/0xb0 [ 3959.024496] invoke_syscall+0xd4/0x258 [ 3959.024507] el0_svc_common.constprop.0+0xb4/0x240 [ 3959.024514] do_el0_svc+0x48/0x68 [ 3959.024520] el0_svc+0x40/0xf8 [ 3959.024526] el0t_64_sync_handler+0xa0/0xe8 [ 3959.024533] el0t_64_sync+0x1ac/0x1b0 [ 3959.024540] ---[ end trace 0000000000000000 ]--- When __memcg_slab_post_alloc_hook() fails, there are two different free paths depending on whether size == 1 or size != 1. In the kmem_cache_free_bulk() path, we do call alloc_tagging_slab_free_hook(). However, in memcg_alloc_abort_single() we don't, the above warning will be triggered on the next allocation. Therefore, add alloc_tagging_slab_free_hook() to the memcg_alloc_abort_single() path.
- https://ubuntu.com/security/CVE-2026-23219 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-23219 Third Party Advisory
- https://git.kernel.org/linus/e6c53ead2d8fa73206e0a63e9cd9aea6bc929837 Third Party Advisory
- https://git.kernel.org/stable/c/b8bc72587c79fe52c14732e16a766b6eded00707 Third Party Advisory
- https://git.kernel.org/stable/c/e6c53ead2d8fa73206e0a63e9cd9aea6bc929837 Third Party Advisory
- https://git.kernel.org/stable/c/e8af57e090790983591f6927b3d89ee6383f8c1e Third Party Advisory
Published: 18 Feb 2026 · Updated: 13 Mar 2026 · First seen: 9 Mar 2026