https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sat, 03 Oct 2026 19:44:32 +0000 https://vulnerability.circl.lu/vuln/cve-2025-40237 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>fs/notify: call exportfs_encode_fid with s_umount</p> <p>Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while the overlayfs is being unmounted, can lead to dereferencing NULL ptr.</p> <p>This issue was found by syzkaller.</p> <p>Race Condition Diagram:</p> <p>Thread 1 Thread 2 -------- --------</p> <p>generic_shutdown_super() shrink_dcache_for_umount sb-&gt;s_root = NULL</p> <p>| | 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-&gt;s_root * | | v fsnotify_sb_delete(sb)</p> <p>Which then leads to:</p> <p>[ 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)</p> <p>&lt;snip registers, unreliable trace&gt;</p> <p>[ 32.143353] Call Trace…</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>fs/notify: call exportfs_encode_fid with s_umount</p> <p>Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while the overlayfs is being unmounted, can lead to dereferencing NULL ptr.</p> <p>This issue was found by syzkaller.</p> <p>Race Condition Diagram:</p> <p>Thread 1 Thread 2 -------- --------</p> <p>generic_shutdown_super() shrink_dcache_for_umount sb-&gt;s_root = NULL</p> <p>| | 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-&gt;s_root * | | v fsnotify_sb_delete(sb)</p> <p>Which then leads to:</p> <p>[ 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)</p> <p>&lt;snip registers, unreliable trace&gt;</p> <p>[ 32.143353] Call Trace…</p> https://vulnerability.circl.lu/vuln/cve-2025-40237