{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49456", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.574Z", "datePublished": "2025-02-26T02:13:04.787Z", "dateUpdated": "2026-08-05T08:55:14.980Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:14.980Z" }, "descriptions": [ { "lang": "en", "value": "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 \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/" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached via setsockopt(SO_TIMESTAMPING with SOF_TIMESTAMPING_BIND_PHC) on a socket bound to a bonding device, flowing through sock_timestamping_bind_phc → ethtool_get_phc_vclocks → bond_ethtool_get_ts_info. This is a local syscall path, not packet- or network-facing processing.\nAC:L - An attacker who can create and manage a bond (e.g. via user namespaces) controls both sides of the race: repeatedly calling setsockopt while releasing/changing the active slave. Missing RCU protection lets synchronize_rcu in bond_release complete and free struct slave while the reader still uses it.\nPR:L - SO_TIMESTAMPING requires no capability, and the first SO_BINDTODEVICE needs none. Creating/configuring a bond and enslaving interfaces needs only CAP_NET_ADMIN in the network namespace's user_ns, which is available to an unprivileged user via user namespaces.\nUI:N - Exploitation requires only attacker-controlled syscalls (setsockopt and netlink bond/slave operations); no victim action is needed.\nS:U - This is a standard in-kernel UAF/RCU bug in the bonding driver that can escalate privileges within the same kernel authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - Without RCU protection, concurrent slave release can free struct slave while bond_option_active_slave_get_rcu still reads slave->dev and later uses real_dev, yielding a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF on the active-slave path enables heap reuse and control of freed object contents, which is exploitable for arbitrary write / control-flow hijacking in the kernel.\nA:H - Use-after-free of the slave/netdev path can cause kernel oops/panic, and even the unprotected rcu_dereference alone triggers lockdep warnings; availability impact is therefore High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/bonding/bond_main.c" ], "versions": [ { "version": "aa6034678e873db8bd5c5a4b73f8b88c469374d6", "lessThan": "1b66a533c47d29b38af8e05fbb53b609a5ba3a4e", "status": "affected", "versionType": "git" }, { "version": "aa6034678e873db8bd5c5a4b73f8b88c469374d6", "lessThan": "85eed460681da71b359ed906bce4d800081db854", "status": "affected", "versionType": "git" }, { "version": "aa6034678e873db8bd5c5a4b73f8b88c469374d6", "lessThan": "9b80ccda233fa6c59de411bf889cc4d0e028f2c7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/bonding/bond_main.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1b66a533c47d29b38af8e05fbb53b609a5ba3a4e" }, { "url": "https://git.kernel.org/stable/c/85eed460681da71b359ed906bce4d800081db854" }, { "url": "https://git.kernel.org/stable/c/9b80ccda233fa6c59de411bf889cc4d0e028f2c7" } ], "title": "bonding: fix missed rcu protection", "x_generator": { "engine": "bippy-1.2.0" } } } }