CVE-2026-74722

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: fix memory leak in btrfs_do_encoded_write()<br /> <br /> Local fuzzing of 6.12.94 has found the following memory leak:<br /> <br /> Unreferenced object 0xffff888018050a80 (size 64):<br /> comm "syz.0.17", pid 10297, jiffies 4294953601<br /> hex dump (first 32 bytes):<br /> 00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................<br /> 10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................<br /> backtrace (crc a8a6fc29):<br /> kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]<br /> slab_post_alloc_hook mm/slub.c:4152 [inline]<br /> slab_alloc_node mm/slub.c:4197 [inline]<br /> __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358<br /> kmalloc_noprof include/linux/slab.h:878 [inline]<br /> extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]<br /> qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305<br /> btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355<br /> btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746<br /> btrfs_encoded_write fs/btrfs/file.c:1482 [inline]<br /> btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507<br /> btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738<br /> btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:906 [inline]<br /> __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892<br /> do_syscall_x64 arch/x86/entry/common.c:47 [inline]<br /> do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Unreferenced object 0xffff888018050a00 (size 64):<br /> comm "syz.0.17", pid 10297, jiffies 4294953601<br /> hex dump (first 32 bytes):<br /> 00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................<br /> 90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................<br /> backtrace (crc cb5c9580):<br /> kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]<br /> slab_post_alloc_hook mm/slub.c:4152 [inline]<br /> slab_alloc_node mm/slub.c:4197 [inline]<br /> __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358<br /> kmalloc_noprof include/linux/slab.h:878 [inline]<br /> kzalloc_noprof include/linux/slab.h:1014 [inline]<br /> ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114<br /> extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]<br /> __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086<br /> set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821<br /> qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312<br /> btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355<br /> btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746<br /> btrfs_encoded_write fs/btrfs/file.c:1482 [inline]<br /> btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507<br /> btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738<br /> btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:906 [inline]<br /> __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892<br /> do_syscall_x64 arch/x86/entry/common.c:47 [inline]<br /> do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Fix this by freeing an extent changeset before returning from<br /> btrfs_do_encoded_write().