Threats Tagged 'cve-2025-40237'

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: fs/notify: call exportfs_encode_fid with s_umount (CVE-2025-40237) * kernel: scsi: core: Wake up the error handler when final completions race against each other (CVE-2026-23110) * kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692) * kernel: net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (CVE-2026-46099) * kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc (CVE-2026-52973) * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

A high-severity vulnerability (CVE-2025-40214) in the Linux kernel's Unix domain sockets subsystem was resolved by initializing scc_index in unix_add_edge(). This flaw could lead to privilege escalation on Container-Optimized OS nodes, affecting multiple Google Kubernetes Engine (GKE) cluster types except those using GKE Sandbox. Patch versions have been released for various Container-Optimized OS node pools and Ubuntu Linux kernel packages. Bare metal GDC software is not affected. Users are advised to update to the specified patched kernel versions and reboot to apply fixes.

In the Linux kernel, the following vulnerability has been resolved: fs/notify: call exportfs_encode_fid with s_umount Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while the overlayfs is being unmounted, can lead to dereferencing NULL ptr. This issue was found by syzkaller. Race Condition Diagram: Thread 1 Thread 2 -------- -------- generic_shutdown_super() shrink_dcache_for_umount sb->s_root = NULL | | vfs_read() | inotify_fdinfo() | * inode get from mark * | show_mark_fhandle(m, inode) | exportfs_encode_fid(inode, ..) | ovl_encode_fh(inode, ..) | ovl_check_encode_origin(inode) | * deref i_sb->s_root * | | v fsnotify_sb_delete(sb) Which then leads to: [ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] [ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none) <snip registers, unreliable trace> [ 32.143353] Call Trace: [ 32.143732] ovl_encode_fh+0xd5/0x170 [ 32.144031] exportfs_encode_inode_fh+0x12f/0x300 [ 32.144425] show_mark_fhandle+0xbe/0x1f0 [ 32.145805] inotify_fdinfo+0x226/0x2d0 [ 32.146442] inotify_show_fdinfo+0x1c5/0x350 [ 32.147168] seq_show+0x530/0x6f0 [ 32.147449] seq_read_iter+0x503/0x12a0 [ 32.148419] seq_read+0x31f/0x410 [ 32.150714] vfs_read+0x1f0/0x9e0 [ 32.152297] ksys_read+0x125/0x240 IOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set to NULL in the unmount path. Fix it by protecting calling exportfs_encode_fid() from show_mark_fhandle() with s_umount lock. This form of fix was suggested by Amir in [1]. [1]: https://lore.kernel.org/all/CAOQ4uxhbDwhb+2Brs1UdkoF0a3NSdBAOQPNfEHjahrgoKJpLEw@mail.gmail.com/