{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54004", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T10:53:46.177Z", "datePublished": "2025-12-24T10:55:39.149Z", "dateUpdated": "2026-08-05T09:16:35.196Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:16:35.196Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().\n\nsyzbot reported [0] a null-ptr-deref in sk_get_rmem0() while using\nIPPROTO_UDPLITE (0x88):\n\n 14:25:52 executing program 1:\n r0 = socket$inet6(0xa, 0x80002, 0x88)\n\nWe had a similar report [1] for probably sk_memory_allocated_add()\nin __sk_mem_raise_allocated(), and commit c915fe13cbaa (\"udplite: fix\nNULL pointer dereference\") fixed it by setting .memory_allocated for\nudplite_prot and udplitev6_prot.\n\nTo fix the variant, we need to set either .sysctl_wmem_offset or\n.sysctl_rmem.\n\nNow UDP and UDPLITE share the same value for .memory_allocated, so we\nuse the same .sysctl_wmem_offset for UDP and UDPLITE.\n\n[0]:\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nCPU: 0 PID: 6829 Comm: syz-executor.1 Not tainted 6.4.0-rc2-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023\nRIP: 0010:sk_get_rmem0 include/net/sock.h:2907 [inline]\nRIP: 0010:__sk_mem_raise_allocated+0x806/0x17a0 net/core/sock.c:3006\nCode: c1 ea 03 80 3c 02 00 0f 85 23 0f 00 00 48 8b 44 24 08 48 8b 98 38 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 0f 8d 6f 0a 00 00 8b\nRSP: 0018:ffffc90005d7f450 EFLAGS: 00010246\nRAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004d92000\nRDX: 0000000000000000 RSI: ffffffff88066482 RDI: ffffffff8e2ccbb8\nRBP: ffff8880173f7000 R08: 0000000000000005 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: 0000000000030000\nR13: 0000000000000001 R14: 0000000000000340 R15: 0000000000000001\nFS: 0000000000000000(0000) GS:ffff8880b9800000(0063) knlGS:00000000f7f1cb40\nCS: 0010 DS: 002b ES: 002b CR0: 0000000080050033\nCR2: 000000002e82f000 CR3: 0000000034ff0000 CR4: 00000000003506f0\nCall Trace:\n \n __sk_mem_schedule+0x6c/0xe0 net/core/sock.c:3077\n udp_rmem_schedule net/ipv4/udp.c:1539 [inline]\n __udp_enqueue_schedule_skb+0x776/0xb30 net/ipv4/udp.c:1581\n __udpv6_queue_rcv_skb net/ipv6/udp.c:666 [inline]\n udpv6_queue_rcv_one_skb+0xc39/0x16c0 net/ipv6/udp.c:775\n udpv6_queue_rcv_skb+0x194/0xa10 net/ipv6/udp.c:793\n __udp6_lib_mcast_deliver net/ipv6/udp.c:906 [inline]\n __udp6_lib_rcv+0x1bda/0x2bd0 net/ipv6/udp.c:1013\n ip6_protocol_deliver_rcu+0x2e7/0x1250 net/ipv6/ip6_input.c:437\n ip6_input_finish+0x150/0x2f0 net/ipv6/ip6_input.c:482\n NF_HOOK include/linux/netfilter.h:303 [inline]\n NF_HOOK include/linux/netfilter.h:297 [inline]\n ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:491\n ip6_mc_input+0x40b/0xf50 net/ipv6/ip6_input.c:585\n dst_input include/net/dst.h:468 [inline]\n ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]\n NF_HOOK include/linux/netfilter.h:303 [inline]\n NF_HOOK include/linux/netfilter.h:297 [inline]\n ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309\n __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491\n __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605\n netif_receive_skb_internal net/core/dev.c:5691 [inline]\n netif_receive_skb+0x133/0x7a0 net/core/dev.c:5750\n tun_rx_batched+0x4b3/0x7a0 drivers/net/tun.c:1553\n tun_get_user+0x2452/0x39c0 drivers/net/tun.c:1989\n tun_chr_write_iter+0xdf/0x200 drivers/net/tun.c:2035\n call_write_iter include/linux/fs.h:1868 [inline]\n new_sync_write fs/read_write.c:491 [inline]\n vfs_write+0x945/0xd50 fs/read_write.c:584\n ksys_write+0x12b/0x250 fs/read_write.c:637\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\nRIP: 0023:0xf7f21579\nCode: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The NULL dereference occurs in the UDP/UDP-Lite packet receive path (`__udp6_lib_rcv`/`__udp4_lib_rcv` → `__udp_enqueue_schedule_skb`), executed in softirq while processing frames arriving from the network. A remote peer sending IPPROTO_UDPLITE (proto 136) datagrams to a host with a UDP-Lite socket bound reaches the faulting code with no local access.\nAC:L - The only gating condition is that global `udp_memory_allocated` exceed `sysctl_udp_mem[0]`, and the attacker creates that condition themselves by flooding UDP/UDP-Lite receive queues (the two protocols share the same global counter and limits), so it is fully attacker-influenceable. udplite is built unconditionally into every kernel (`obj-y` / part of `ipv6.o`), requiring no rare configuration.\nPR:N - There is no authentication, capability check, or socket-ownership check anywhere between `netif_receive_skb` and `sk_get_rmem0`; the packet is processed in softirq before any credential evaluation. An unauthenticated remote sender of UDP-Lite datagrams triggers it.\nUI:N - The crash occurs entirely during inbound packet processing in softirq context, driven solely by attacker-supplied datagrams. No victim action is required.\nS:U - The fault is a kernel oops within the same security authority as the affected kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The bug is a read of `*(int *)NULL` that faults immediately; no kernel memory contents are returned to the attacker and no out-of-bounds data is exposed.\nI:N - The defect is a NULL read with no write primitive, no attacker-controlled offset, and no influence over control flow or kernel data structures.\nA:H - Dereferencing the NULL `sysctl_rmem` pointer produces a general protection fault/oops in softirq context, crashing the kernel; the attacker can repeat it at will to keep the system down." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udplite.c", "net/ipv6/udplite.c" ], "versions": [ { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "cc56de054d828935aa37734b479f82fa34b5f9bd", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "7e3ae83371a4809da6fa3f10ccc430eecef3034a", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "5014b64e369bdf997935b132a1ac4d64b6e47ad4", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "387bd0a3af3bdd2b16f8dbef0c9fcccac63000a4", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "2a112f04629f7839e7cb509b27b8d3b735afe255", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "f04c8eaf45e7dcdfccba936506b1ec592a369fb9", "status": "affected", "versionType": "git" }, { "version": "850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9", "lessThan": "ad42a35bdfc6d3c0fc4cb4027d7b2757ce665665", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udplite.c", "net/ipv6/udplite.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.284", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.244", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.181", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.114", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.31", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.5", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "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": "4.10", "versionEndExcluding": "4.19.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.4.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.10.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.15.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.1.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.3.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cc56de054d828935aa37734b479f82fa34b5f9bd" }, { "url": "https://git.kernel.org/stable/c/7e3ae83371a4809da6fa3f10ccc430eecef3034a" }, { "url": "https://git.kernel.org/stable/c/5014b64e369bdf997935b132a1ac4d64b6e47ad4" }, { "url": "https://git.kernel.org/stable/c/387bd0a3af3bdd2b16f8dbef0c9fcccac63000a4" }, { "url": "https://git.kernel.org/stable/c/2a112f04629f7839e7cb509b27b8d3b735afe255" }, { "url": "https://git.kernel.org/stable/c/f04c8eaf45e7dcdfccba936506b1ec592a369fb9" }, { "url": "https://git.kernel.org/stable/c/ad42a35bdfc6d3c0fc4cb4027d7b2757ce665665" } ], "title": "udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().", "x_generator": { "engine": "bippy-1.2.0" } } } }