{"id":"CVE-2024-41048","revision":null,"records":[{"revision":"b844c4e6e1fc433bbb4746a08384e01a","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2024-41048","aliases":[],"title":"skmsg: Skip zero length skb in sk_msg_recvmsg","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nskmsg: Skip zero length skb in sk_msg_recvmsg\n\nWhen running BPF selftests (./test_progs -t sockmap_basic) on a Loongarch\nplatform, the following kernel panic occurs:\n\n [...]\n Oops[#1]:\n CPU: 22 PID: 2824 Comm: test_progs Tainted: G OE 6.10.0-rc2+ #18\n Hardware name: LOONGSON Dabieshan/Loongson-TC542F0, BIOS Loongson-UDK2018\n ... ...\n ra: 90000000048bf6c0 sk_msg_recvmsg+0x120/0x560\n ERA: 9000000004162774 copy_page_to_iter+0x74/0x1c0\n CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)\n PRMD: 0000000c (PPLV0 +PIE +PWE)\n EUEN: 00000007 (+FPE +SXE +ASXE -BTE)\n ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)\n ESTAT: 00010000 [PIL] (IS= ECode=1 EsubCode=0)\n BADV: 0000000000000040\n PRID: 0014c011 (Loongson-64bit, Loongson-3C5000)\n Modules linked in: bpf_testmod(OE) xt_CHECKSUM xt_MASQUERADE xt_conntrack\n Process test_progs (pid: 2824, threadinfo=0000000000863a31, task=...)\n Stack : ...\n Call Trace:\n [<9000000004162774>] copy_page_to_iter+0x74/0x1c0\n [<90000000048bf6c0>] sk_msg_recvmsg+0x120/0x560\n [<90000000049f2b90>] tcp_bpf_recvmsg_parser+0x170/0x4e0\n [<90000000049aae34>] inet_recvmsg+0x54/0x100\n [<900000000481ad5c>] sock_recvmsg+0x7c/0xe0\n [<900000000481e1a8>] __sys_recvfrom+0x108/0x1c0\n [<900000000481e27c>] sys_recvfrom+0x1c/0x40\n [<9000000004c076ec>] do_syscall+0x8c/0xc0\n [<9000000003731da4>] handle_syscall+0xc4/0x160\n Code: ...\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception\n Kernel relocated by 0x3510000\n .text @ 0x9000000003710000\n .data @ 0x9000000004d70000\n .bss @ 0x9000000006469400\n ---[ end Kernel panic - not syncing: Fatal exception ]---\n [...]\n\nThis crash happens every time when running sockmap_skb_verdict_shutdown\nsubtest in sockmap_basic.\n\nThis crash is because a NULL pointer is passed to page_address() in the\nsk_msg_recvmsg(). Due to the different implementations depending on the\narchitecture, page_address(NULL) will trigger a panic on Loongarch\nplatform but not on x86 platform. So this bug was hidden on x86 platform\nfor a while, but now it is exposed on Loongarch platform. The root cause\nis that a zero length skb (skb->len == 0) was put on the queue.\n\nThis zero length skb is a TCP FIN packet, which was sent by shutdown(),\ninvoked in test_sockmap_skb_verdict_shutdown():\n\n\tshutdown(p1, SHUT_WR);\n\nIn this case, in sk_psock_skb_ingress_enqueue(), num_sge is zero, and no\npage is put to this sge (see sg_set_page in sg_set_page), but this empty\nsge is queued into ingress_msg list.\n\nAnd in sk_msg_recvmsg(), this empty sge is used, and a NULL page is got by\nsg_page(sge). Pass this NULL page to copy_page_to_iter(), which passes it\nto kmap_local_page() and to page_address(), then kernel panics.\n\nTo solve this, we should skip this zero length skb. So in sk_msg_recvmsg(),\nif copy is zero, that means it's a zero length skb, skip invoking\ncopy_page_to_iter(). We are using the EFAULT return triggered by\ncopy_page_to_iter to check for is_fin in tcp_bpf.c.","state":0,"publishedAt":"2024-07-29T14:32:05.224+00:00","modifiedAt":"2026-10-30T12:18:45.453+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/core/skmsg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"ddf6f5179638ef0716d32e8fc04a72822b135351\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"195b7bcdfc5adc5b2468f279dd9eb7eebd2e7632\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"fb61d7b9fb6ef0032de469499a54dab4c7260d0d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"b180739b45a38b4caa88fe16bb5273072e6613dc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"f8bd689f37f4198a4c61c4684f591ba639595b97\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"604326b41a6fb9b4a78b6179335decee0365cd8c\",\n \"lessThan\": \"f0c18025693707ec344a70b6887f7450bf4c826b\",\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/core/skmsg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.20\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.20\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.273\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.163\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.100\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.41\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.9.10\",\n \"lessThanOrEqual\": \"6.9.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.10\",\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/ddf6f5179638ef0716d32e8fc04a72822b135351","https://git.kernel.org/stable/c/195b7bcdfc5adc5b2468f279dd9eb7eebd2e7632","https://git.kernel.org/stable/c/fb61d7b9fb6ef0032de469499a54dab4c7260d0d","https://git.kernel.org/stable/c/b180739b45a38b4caa88fe16bb5273072e6613dc","https://git.kernel.org/stable/c/f8bd689f37f4198a4c61c4684f591ba639595b97","https://git.kernel.org/stable/c/f0c18025693707ec344a70b6887f7450bf4c826b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-41048","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-41048","identifiers":["CVE-2024-41048"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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