{"id":"DEBIAN-CVE-2024-50265","details":"In the Linux kernel, the following vulnerability has been resolved:  ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()  Syzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():  [   57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12 [   57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper.  Leaking 1 clusters and removing the entry [   57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004 [...] [   57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [...] [   57.331328] Call Trace: [   57.331477]  \u003cTASK\u003e [...] [   57.333511]  ? do_user_addr_fault+0x3e5/0x740 [   57.333778]  ? exc_page_fault+0x70/0x170 [   57.334016]  ? asm_exc_page_fault+0x2b/0x30 [   57.334263]  ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10 [   57.334596]  ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [   57.334913]  ocfs2_xa_remove_entry+0x23/0xc0 [   57.335164]  ocfs2_xa_set+0x704/0xcf0 [   57.335381]  ? _raw_spin_unlock+0x1a/0x40 [   57.335620]  ? ocfs2_inode_cache_unlock+0x16/0x20 [   57.335915]  ? trace_preempt_on+0x1e/0x70 [   57.336153]  ? start_this_handle+0x16c/0x500 [   57.336410]  ? preempt_count_sub+0x50/0x80 [   57.336656]  ? _raw_read_unlock+0x20/0x40 [   57.336906]  ? start_this_handle+0x16c/0x500 [   57.337162]  ocfs2_xattr_block_set+0xa6/0x1e0 [   57.337424]  __ocfs2_xattr_set_handle+0x1fd/0x5d0 [   57.337706]  ? ocfs2_start_trans+0x13d/0x290 [   57.337971]  ocfs2_xattr_set+0xb13/0xfb0 [   57.338207]  ? dput+0x46/0x1c0 [   57.338393]  ocfs2_xattr_trusted_set+0x28/0x30 [   57.338665]  ? ocfs2_xattr_trusted_set+0x28/0x30 [   57.338948]  __vfs_removexattr+0x92/0xc0 [   57.339182]  __vfs_removexattr_locked+0xd5/0x190 [   57.339456]  ? preempt_count_sub+0x50/0x80 [   57.339705]  vfs_removexattr+0x5f/0x100 [...]  Reproducer uses faultinject facility to fail ocfs2_xa_remove() -\u003e ocfs2_xa_value_truncate() with -ENOMEM.  In this case the comment mentions that we can return 0 if ocfs2_xa_cleanup_value_truncate() is going to wipe the entry anyway. But the following 'rc' check is wrong and execution flow do 'ocfs2_xa_remove_entry(loc);' twice: * 1st: in ocfs2_xa_cleanup_value_truncate(); * 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'.  Fix this by skipping the 2nd removal of the same entry and making syzkaller repro happy.","modified":"2026-09-15T09:03:15.621925595Z","published":"2024-11-19T02:16:28.310Z","upstream":["CVE-2024-50265"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-50265"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.119-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50265.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50265.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50265.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}