{"id":"CVE-2024-53124","revision":null,"records":[{"revision":"2b1255be379643b5b931fa4bfbb53481","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-53124","aliases":[],"title":"net: fix data-races around sk->sk_forward_alloc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix data-races around sk->sk_forward_alloc\n\nSyzkaller reported this warning:\n ------------[ cut here ]------------\n WARNING: CPU: 0 PID: 16 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x1c5/0x1e0\n Modules linked in:\n CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-rc5 #26\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n RIP: 0010:inet_sock_destruct+0x1c5/0x1e0\n Code: 24 12 4c 89 e2 5b 48 c7 c7 98 ec bb 82 41 5c e9 d1 18 17 ff 4c 89 e6 5b 48 c7 c7 d0 ec bb 82 41 5c e9 bf 18 17 ff 0f 0b eb 83 <0f> 0b eb 97 0f 0b eb 87 0f 0b e9 68 ff ff ff 66 66 2e 0f 1f 84 00\n RSP: 0018:ffffc9000008bd90 EFLAGS: 00010206\n RAX: 0000000000000300 RBX: ffff88810b172a90 RCX: 0000000000000007\n RDX: 0000000000000002 RSI: 0000000000000300 RDI: ffff88810b172a00\n RBP: ffff88810b172a00 R08: ffff888104273c00 R09: 0000000000100007\n R10: 0000000000020000 R11: 0000000000000006 R12: ffff88810b172a00\n R13: 0000000000000004 R14: 0000000000000000 R15: ffff888237c31f78\n FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007ffc63fecac8 CR3: 000000000342e000 CR4: 00000000000006f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n \n ? __warn+0x88/0x130\n ? inet_sock_destruct+0x1c5/0x1e0\n ? report_bug+0x18e/0x1a0\n ? handle_bug+0x53/0x90\n ? exc_invalid_op+0x18/0x70\n ? asm_exc_invalid_op+0x1a/0x20\n ? inet_sock_destruct+0x1c5/0x1e0\n __sk_destruct+0x2a/0x200\n rcu_do_batch+0x1aa/0x530\n ? rcu_do_batch+0x13b/0x530\n rcu_core+0x159/0x2f0\n handle_softirqs+0xd3/0x2b0\n ? __pfx_smpboot_thread_fn+0x10/0x10\n run_ksoftirqd+0x25/0x30\n smpboot_thread_fn+0xdd/0x1d0\n kthread+0xd3/0x100\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \n ---[ end trace 0000000000000000 ]---\n\nIts possible that two threads call tcp_v6_do_rcv()/sk_forward_alloc_add()\nconcurrently when sk->sk_state == TCP_LISTEN with sk->sk_lock unlocked,\nwhich triggers a data-race around sk->sk_forward_alloc:\ntcp_v6_rcv\n tcp_v6_do_rcv\n skb_clone_and_charge_r\n sk_rmem_schedule\n __sk_mem_schedule\n sk_forward_alloc_add()\n skb_set_owner_r\n sk_mem_charge\n sk_forward_alloc_add()\n __kfree_skb\n skb_release_all\n skb_release_head_state\n sock_rfree\n sk_mem_uncharge\n sk_forward_alloc_add()\n sk_mem_reclaim\n // set local var reclaimable\n __sk_mem_reclaim\n sk_forward_alloc_add()\n\nIn this syzkaller testcase, two threads call\ntcp_v6_do_rcv() with skb->truesize=768, the sk_forward_alloc changes like\nthis:\n (cpu 1) | (cpu 2) | sk_forward_alloc\n ... | ... | 0\n __sk_mem_schedule() | | +4096 = 4096\n | __sk_mem_schedule() | +4096 = 8192\n sk_mem_charge() | | -768 = 7424\n | sk_mem_charge() | -768 = 6656\n ... | ... |\n sk_mem_uncharge() | | +768 = 7424\n reclaimable=7424 | |\n | sk_mem_uncharge() | +768 = 8192\n | reclaimable=8192 |\n __sk_mem_reclaim() | | -4096 = 4096\n | __sk_mem_reclaim() | -8192 = -4096 != 0\n\nThe skb_clone_and_charge_r() should not be called in tcp_v6_do_rcv() when\nsk->sk_state is TCP_LISTEN, it happens later in tcp_v6_syn_recv_sock().\nFix the same issue in dccp_v6_do_rcv().","state":0,"publishedAt":"2024-12-02T13:44:54.257+00:00","modifiedAt":"2026-10-15T00:58:49.179+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/dccp/ipv6.c\",\n \"net/ipv6/tcp_ipv6.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"695fb0b9aecfd5dd5b2946ba8897ac2c1eef654d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"fe2c0bd6d1e29ccefdc978b9a290571c93c27473\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"c3d052cae566ec2285f5999958a5deb415a0f59e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"be7c61ea5f816168c38955eb4e898adc8b4b32fd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"3f51f8c9d28954cf380100883a02eed35a8277e9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"d285eb9d0641c8344f2836081b4ccb7b3c5cc1b6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e994b2f0fb9229aeff5eea9541320bd7b2ca8714\",\n \"lessThan\": \"073d89808c065ac4c672c0a613a71b27a80691cb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/dccp/ipv6.c\",\n \"net/ipv6/tcp_ipv6.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.4\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.4\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.290\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.234\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.177\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.127\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.74\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.11.10\",\n \"lessThanOrEqual\": \"6.11.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/695fb0b9aecfd5dd5b2946ba8897ac2c1eef654d","https://git.kernel.org/stable/c/fe2c0bd6d1e29ccefdc978b9a290571c93c27473","https://git.kernel.org/stable/c/c3d052cae566ec2285f5999958a5deb415a0f59e","https://git.kernel.org/stable/c/be7c61ea5f816168c38955eb4e898adc8b4b32fd","https://git.kernel.org/stable/c/3f51f8c9d28954cf380100883a02eed35a8277e9","https://git.kernel.org/stable/c/d285eb9d0641c8344f2836081b4ccb7b3c5cc1b6","https://git.kernel.org/stable/c/073d89808c065ac4c672c0a613a71b27a80691cb"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-53124","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-53124","identifiers":["CVE-2024-53124"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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