{"cve":"CVE-2022-49456","nvd":{"published":"2025-02-26T07:01:21.950","modified":"2026-08-04T10:17:48.527","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: fix missed rcu protection\n\nWhen removing the rcu_read_lock in bond_ethtool_get_ts_info() as\ndiscussed [1], I didn't notice it could be called via setsockopt,\nwhich doesn't hold rcu lock, as syzbot pointed:\n\n  stack backtrace:\n  CPU: 0 PID: 3599 Comm: syz-executor317 Not tainted 5.18.0-rc5-syzkaller-01392-g01f4685797a5 #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n  Call Trace:\n   <TASK>\n   __dump_stack lib/dump_stack.c:88 [inline]\n   dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n   bond_option_active_slave_get_rcu include/net/bonding.h:353 [inline]\n   bond_ethtool_get_ts_info+0x32c/0x3a0 drivers/net/bonding/bond_main.c:5595\n   __ethtool_get_ts_info+0x173/0x240 net/ethtool/common.c:554\n   ethtool_get_phc_vclocks+0x99/0x110 net/ethtool/common.c:568\n   sock_timestamping_bind_phc net/core/sock.c:869 [inline]\n   sock_set_timestamping+0x3a3/0x7e0 net/core/sock.c:916\n   sock_setsockopt+0x543/0x2ec0 net/core/sock.c:1221\n   __sys_setsockopt+0x55e/0x6a0 net/socket.c:2223\n   __do_sys_setsockopt net/socket.c:2238 [inline]\n   __se_sys_setsockopt net/socket.c:2235 [inline]\n   __x64_sys_setsockopt+0xba/0x150 net/socket.c:2235\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n  RIP: 0033:0x7f8902c8eb39\n\nFix it by adding rcu_read_lock and take a ref on the real_dev.\nSince dev_hold() and dev_put() can take NULL these days, we can\nskip checking if real_dev exist.\n\n[1] https://lore.kernel.org/netdev/27565.1642742439@famine/","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/1b66a533c47d29b38af8e05fbb53b609a5ba3a4e","https://git.kernel.org/stable/c/85eed460681da71b359ed906bce4d800081db854","https://git.kernel.org/stable/c/9b80ccda233fa6c59de411bf889cc4d0e028f2c7"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49456","score":0.00272,"percentile":0.19658,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}