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CVE-2024-26635

Status Candidate

Overview

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->protocol 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

Related Files

Ubuntu Security Notice USN-6777-4
Posted May 23, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6777-4 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-46981, CVE-2023-47233, CVE-2023-52530, CVE-2023-52566, CVE-2023-52602, CVE-2023-52604, CVE-2024-26635, CVE-2024-26735, CVE-2024-26805
SHA-256 | 1ddb7b19b0860afc6380f043e7df1dbadf439c03cab8f2cbfee5d3481b830488
Ubuntu Security Notice USN-6777-3
Posted May 22, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6777-3 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-46981, CVE-2023-47233, CVE-2023-52530, CVE-2023-52566, CVE-2023-52602, CVE-2023-52604, CVE-2024-26635, CVE-2024-26735, CVE-2024-26805
SHA-256 | 0a4ec1b5cdab50af1d45a8024a5c8ea07e1e81310889905d0a681372aa96f76c
Ubuntu Security Notice USN-6777-2
Posted May 20, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6777-2 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-46981, CVE-2023-47233, CVE-2023-52530, CVE-2023-52566, CVE-2023-52602, CVE-2023-52604, CVE-2024-26635, CVE-2024-26735, CVE-2024-26805
SHA-256 | 72271efbeb2c8c72f119354b488d9c7dc86b9ccf7e2897aab881ff2261d7b673
Ubuntu Security Notice USN-6777-1
Posted May 17, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6777-1 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-46981, CVE-2023-47233, CVE-2023-52530, CVE-2023-52566, CVE-2023-52602, CVE-2023-52604, CVE-2024-26635, CVE-2024-26735, CVE-2024-26805
SHA-256 | b8c50fe87a65aab78fee16a7a2e72919e82b274a3499976383ee5ba67e9b0de8
Ubuntu Security Notice USN-6774-1
Posted May 17, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6774-1 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. Sander Wiebing, Alvise de Faveri Tron, Herbert Bos, and Cristiano Giuffrida discovered that the Linux kernel mitigations for the initial Branch History Injection vulnerability were insufficient for Intel processors. A local attacker could potentially use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2022-0001, CVE-2023-47233, CVE-2023-52601, CVE-2023-52602, CVE-2023-52615, CVE-2024-2201, CVE-2024-26614, CVE-2024-26635, CVE-2024-26801
SHA-256 | 879e950c4cc102e3739561be7468b79c78e99aa24cc7b8cac33139378491991e
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