{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-56664", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-56664", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-12-27T15:06:26.276Z", "updatedAt": "2026-10-15T21:41:47.761Z", "importedAt": "2026-10-24T01:57:20.494Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bpf, sockmap: Fix race between element replace and close()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix race between element replace and close()\n\nElement replace (with a socket different from the one stored) may race\nwith socket's close() link popping & unlinking. __sock_map_delete()\nunconditionally unrefs the (wrong) element:\n\n// set map[0] = s0\nmap_update_elem(map, 0, s0)\n\n// drop fd of s0\nclose(s0)\n sock_map_close()\n lock_sock(sk) (s0!)\n sock_map_remove_links(sk)\n link = sk_psock_link_pop()\n sock_map_unlink(sk, link)\n sock_map_delete_from_link\n // replace map[0] with s1\n map_update_elem(map, 0, s1)\n sock_map_update_elem\n (s1!) lock_sock(sk)\n sock_map_update_common\n psock = sk_psock(sk)\n spin_lock(&stab->lock)\n osk = stab->sks[idx]\n sock_map_add_link(..., &stab->sks[idx])\n sock_map_unref(osk, &stab->sks[idx])\n psock = sk_psock(osk)\n sk_psock_put(sk, psock)\n if (refcount_dec_and_test(&psock))\n sk_psock_drop(sk, psock)\n spin_unlock(&stab->lock)\n unlock_sock(sk)\n __sock_map_delete\n spin_lock(&stab->lock)\n sk = *psk // s1 replaced s0; sk == s1\n if (!sk_test || sk_test == sk) // sk_test (s0) != sk (s1); no branch\n sk = xchg(psk, NULL)\n if (sk)\n sock_map_unref(sk, psk) // unref s1; sks[idx] will dangle\n psock = sk_psock(sk)\n sk_psock_put(sk, psock)\n if (refcount_dec_and_test())\n sk_psock_drop(sk, psock)\n spin_unlock(&stab->lock)\n release_sock(sk)\n\nThen close(map) enqueues bpf_map_free_deferred, which finally calls\nsock_map_free(). This results in some refcount_t warnings along with\na KASAN splat [1].\n\nFix __sock_map_delete(), do not allow sock_map_unref() on elements that\nmay have been replaced.\n\n[1]:\nBUG: KASAN: slab-use-after-free in sock_map_free+0x10e/0x330\nWrite of size 4 at addr ffff88811f5b9100 by task kworker/u64:12/1063\n\nCPU: 14 UID: 0 PID: 1063 Comm: kworker/u64:12 Not tainted 6.12.0+ #125\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014\nWorkqueue: events_unbound bpf_map_free_deferred\nCall Trace:\n \n dump_stack_lvl+0x68/0x90\n print_report+0x174/0x4f6\n kasan_report+0xb9/0x190\n kasan_check_range+0x10f/0x1e0\n sock_map_free+0x10e/0x330\n bpf_map_free_deferred+0x173/0x320\n process_one_work+0x846/0x1420\n worker_thread+0x5b3/0xf80\n kthread+0x29e/0x360\n ret_from_fork+0x2d/0x70\n ret_from_fork_asm+0x1a/0x30\n \n\nAllocated by task 1202:\n kasan_save_stack+0x1e/0x40\n kasan_save_track+0x10/0x30\n __kasan_slab_alloc+0x85/0x90\n kmem_cache_alloc_noprof+0x131/0x450\n sk_prot_alloc+0x5b/0x220\n sk_alloc+0x2c/0x870\n unix_create1+0x88/0x8a0\n unix_create+0xc5/0x180\n __sock_create+0x241/0x650\n __sys_socketpair+0x1ce/0x420\n __x64_sys_socketpair+0x92/0x100\n do_syscall_64+0x93/0x180\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFreed by task 46:\n kasan_save_stack+0x1e/0x40\n kasan_save_track+0x10/0x30\n kasan_save_free_info+0x37/0x60\n __kasan_slab_free+0x4b/0x70\n kmem_cache_free+0x1a1/0x590\n __sk_destruct+0x388/0x5a0\n sk_psock_destroy+0x73e/0xa50\n process_one_work+0x846/0x1420\n worker_thread+0x5b3/0xf80\n kthread+0x29e/0x360\n ret_from_fork+0x2d/0x70\n ret_from_fork_asm+0x1a/0x30\n\nThe bu\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "6deb9e85dc9a2ba4414b91c1b5b00b8415910890" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "fdb2cd8957ac51f84c9e742ba866087944bb834b" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "b79a0d1e9a374d1b376933a354c4fcd01fce0365" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "b015f19fedd2e12283a8450dd0aefce49ec57015" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "bf2318e288f636a882eea39f7e1015623629f168" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "ed1fc5d76b81a4d681211333c026202cad4d5649" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.10.236", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.180", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.125", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.67", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }