{"cve":"CVE-2026-74722","nvd":{"published":"2026-08-22T16:16:47.183","modified":"2026-10-14T13:10:00.187","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in btrfs_do_encoded_write()\n\nLocal fuzzing of 6.12.94 has found the following memory leak:\n\nUnreferenced object 0xffff888018050a80 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................\n    10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff  ................\n  backtrace (crc a8a6fc29):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n    qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUnreferenced object 0xffff888018050a00 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00  ................\n    90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff  ................\n  backtrace (crc cb5c9580):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    kzalloc_noprof include/linux/slab.h:1014 [inline]\n    ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n    extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n    __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n    set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n    qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by freeing an extent changeset before returning from\nbtrfs_do_encoded_write().","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0","https://git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31","https://git.kernel.org/stable/c/24a8f2c29aebb753ccb962fbb25bae18d7978f6e","https://git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64","https://git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-74722","score":0.00173,"percentile":0.06622,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}