{"id":"DEBIAN-CVE-2024-26635","details":"In the Linux kernel, the following vulnerability has been resolved:  llc: Drop support for ETH_P_TR_802_2.  syzbot reported an uninit-value bug below. [0]  llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2 (0x0011), and syzbot abused the latter to trigger the bug.    write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', \"90e5dd\"}}}}, 0x16)  llc_conn_handler() initialises local variables {saddr,daddr}.mac based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes them to __llc_lookup().  However, the initialisation is done only when skb-\u003eprotocol is htons(ETH_P_802_2), otherwise, __llc_lookup_established() and __llc_lookup_listener() will read garbage.  The missing initialisation existed prior to commit 211ed865108e (\"net: delete all instances of special processing for token ring\").  It removed the part to kick out the token ring stuff but forgot to close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv().  Let's remove llc_tr_packet_type and complete the deprecation.  [0]: BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90  __llc_lookup_established+0xe9d/0xf90  __llc_lookup net/llc/llc_conn.c:611 [inline]  llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791  llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206  __netif_receive_skb_one_core net/core/dev.c:5527 [inline]  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641  netif_receive_skb_internal net/core/dev.c:5727 [inline]  netif_receive_skb+0x58/0x660 net/core/dev.c:5786  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048  call_write_iter include/linux/fs.h:2020 [inline]  new_sync_write fs/read_write.c:491 [inline]  vfs_write+0x8ef/0x1490 fs/read_write.c:584  ksys_write+0x20f/0x4c0 fs/read_write.c:637  __do_sys_write fs/read_write.c:649 [inline]  __se_sys_write fs/read_write.c:646 [inline]  __x64_sys_write+0x93/0xd0 fs/read_write.c:646  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82  entry_SYSCALL_64_after_hwframe+0x63/0x6b  Local variable daddr created at:  llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783  llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206  CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023","modified":"2026-09-15T09:03:04.807459092Z","published":"2024-03-18T11:15:10.203Z","upstream":["CVE-2024-26635"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-26635"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.76-1"}]}],"versions":["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~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26635.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26635.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26635.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"}]}