{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2022-48721 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2022-48721 is a high-severity vulnerability in Linux kernel, published on 20 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2022-48721 and fix it if it is affected.\n\nWhat it is: CVE-2022-48721 is a high-severity vulnerability in Linux kernel, published on 20 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2022-48721 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2022-48721/ (Markdown: https://insights.sbomify.com/CVE-2022-48721/index.md)","id":"CVE-2022-48721","markdown":"https://insights.sbomify.com/CVE-2022-48721/index.md","name":"CVE-2022-48721","record":{"aliases":["DEBIAN-CVE-2022-48721","GHSA-cw8x-f629-7c3v","ROOT-OS-DEBIAN-11-CVE-2022-48721","UBUNTU-CVE-2022-48721"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A flaw in the Linux kernel's SMC protocol handling causes a crash when waitqueue entries are improperly transferred during TCP fallback, leading to denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Forward wakeup to smc socket waitqueue after fallback\n\nWhen we replace TCP with SMC and a fallback occurs, there may be\nsome socket waitqueue entries remaining in smc socket-\u003ewq, such\nas eppoll_entries inserted by userspace applications.\n\nAfter the fallback, data flows over TCP/IP and only clcsocket-\u003ewq\nwill be woken up. Applications can't be notified by the entries\nwhich were inserted in smc socket-\u003ewq before fallback. So we need\na mechanism to wake up smc socket-\u003ewq at the same time if some\nentries remaining in it.\n\nThe current workaround is to transfer the entries from smc socket-\u003ewq\nto clcsock-\u003ewq during the fallback. But this may cause a crash\nlike this:\n\n general protection fault, probably for non-canonical address 0xdead000000000100: 0000 [#1] PREEMPT SMP PTI\n CPU: 3 PID: 0 Comm: swapper/3 Kdump: loaded Tainted: G E     5.16.0+ #107\n RIP: 0010:__wake_up_common+0x65/0x170\n Call Trace:\n  \u003cIRQ\u003e\n  __wake_up_common_lock+0x7a/0xc0\n  sock_def_readable+0x3c/0x70\n  tcp_data_queue+0x4a7/0xc40\n  tcp_rcv_established+0x32f/0x660\n  ? sk_filter_trim_cap+0xcb/0x2e0\n  tcp_v4_do_rcv+0x10b/0x260\n  tcp_v4_rcv+0xd2a/0xde0\n  ip_protocol_deliver_rcu+0x3b/0x1d0\n  ip_local_deliver_finish+0x54/0x60\n  ip_local_deliver+0x6a/0x110\n  ? tcp_v4_early_demux+0xa2/0x140\n  ? tcp_v4_early_demux+0x10d/0x140\n  ip_sublist_rcv_finish+0x49/0x60\n  ip_sublist_rcv+0x19d/0x230\n  ip_list_rcv+0x13e/0x170\n  __netif_receive_skb_list_core+0x1c2/0x240\n  netif_receive_skb_list_internal+0x1e6/0x320\n  napi_complete_done+0x11d/0x190\n  mlx5e_napi_poll+0x163/0x6b0 [mlx5_core]\n  __napi_poll+0x3c/0x1b0\n  net_rx_action+0x27c/0x300\n  __do_softirq+0x114/0x2d2\n  irq_exit_rcu+0xb4/0xe0\n  common_interrupt+0xba/0xe0\n  \u003c/IRQ\u003e\n  \u003cTASK\u003e\n\nThe crash is caused by privately transferring waitqueue entries from\nsmc socket-\u003ewq to clcsock-\u003ewq. The owners of these entries, such as\nepoll, have no idea that the entries have been transferred to a\ndifferent socket wait queue and still use original waitqueue spinlock\n(smc socket-\u003ewq.wait.lock) to make the entries operation exclusive,\nbut it doesn't work. The operations to the entries, such as removing\nfrom the waitqueue (now is clcsock-\u003ewq after fallback), may cause a\ncrash when clcsock waitqueue is being iterated over at the moment.\n\nThis patch tries to fix this by no longer transferring wait queue\nentries privately, but introducing own implementations of clcsock's\ncallback functions in fallback situation. The callback functions will\nforward the wakeup to smc socket-\u003ewq if clcsock-\u003ewq is actually woken\nup and smc socket-\u003ewq has remaining entries.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net/smc: Forward wakeup to smc socket waitqueue after fallback","id":"CVE-2022-48721","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2022"},"n_packages":0,"n_references":3,"next":{"headline":"net: ieee802154: ca8210: Stop leaking skb's","id":"CVE-2022-48722"},"packages":[],"prev":{"headline":"net: macsec: Fix offload support for NETDEV_UNREGISTER event","id":"CVE-2022-48720"},"products":["Linux"],"published":"2024-06-20","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A flaw in the Linux kernel's SMC protocol handling causes a crash when waitqueue entries are improperly transferred during TCP fallback, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2022-48721/"}