In the Linux kernel, the following vulnerability has been resolved:
btrfs: lzo: reject compressed segment that overflows the compressed input
lzo_decompress_bio() validates each on-disk segment length seg_len only against the workspace cbuf size, not against the compressed input size (compressed_len, the total folio bytes of the bio). A crafted extent can carry a segment whose seg_len passes the cbuf check but runs past the end of the bio, so copy_compressed_segment() walks off the last folio: get_current_folio() then returns the NULL folio from bio_next_folio(), and with CONFIG_BTRFS_ASSERT disabled (default) folio_size(NULL) faults.
BUG: KASAN: null-ptr-deref in lzo_decompress_bio (fs/btrfs/lzo.c:383) Read of size 8 at addr 0000000000000000 by task kworker/u8:1/29 Workqueue: btrfs-endio simple_end_io_work kasan_report (mm/kasan/report.c:590) lzo_decompress_bio (fs/btrfs/lzo.c:383) end_bbio_compressed_read (fs/btrfs/compression.c:1065) btrfs_bio_end_io (fs/btrfs/bio.c:135) btrfs_check_read_bio (fs/btrfs/bio.c:180 fs/btrfs/bio.c:285) simple_end_io_work process_one_work worker_thread
Reject any segment whose payload would extend beyond compressed_len before copying it, treating it as corruption like the other on-disk validation failures in this function.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Sep 2, 2026 | Aug 28, 2026 |
| Ubuntu | — | Upgrade linux-image-aws-64kUpgrade linux-image-oem-26.04Upgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-generic-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-genericUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-ibmUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-azureUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-oem-26.04aUpgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-7.0.0-1017-azureUpgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-azure-lts-26.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-gkeUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-realtime-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-virtualUpgrade linux-image-7.0.0-38-genericUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-azure-fde-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-awsUpgrade linux-image-7.0.0-1014-awsUpgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-gke-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-generic-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-oracleUpgrade linux-image-realtimeUpgrade linux-image-azure-fdeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-gke-64kUpgrade linux-image-aws-7.0 | Oct 7, 2026 | Oct 6, 2026 |
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