{ "cveId": "CVE-2023-53240", "url": "https://patchblox.com/security/cve/CVE-2023-53240", "summary": "CVE-2023-53240 is fixed in 20 products on 1 platform, first by ALAS2023-2023-138, released March 20, 2023. It is not reported as exploited. Patch Radar priority: Routine.", "title": "xsk: check IFF_UP earlier in Tx path", "description": "In the Linux kernel, the following vulnerability has been resolved: xsk: check IFF_UP earlier in Tx path Xsk Tx can be triggered via either sendmsg() or poll() syscalls. These two paths share a call to common function xsk_xmit() which has two sanity checks within. A pseudo code example to show the two paths: __xsk_sendmsg() : xsk_poll(): if (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs))) return -ENXIO; return mask; if (unlikely(need_wait)) (...) return -EOPNOTSUPP; xsk_xmit() mark napi id (...) xsk_xmit() xsk_xmit(): if (unlikely(!(xs-\u003Edev-\u003Eflags \u0026 IFF_UP))) \treturn -ENETDOWN; if (unlikely(!xs-\u003Etx)) \treturn -ENOBUFS; As it can be observed above, in sendmsg() napi id can be marked on interface that was not brought up and this causes a NULL ptr dereference: [31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018 [31757.512710] #PF: supervisor read access in kernel mode [31757.517936] #PF: error_code(0x0000) - not-present page [31757.523149] PGD 0 P4D 0 [31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI [31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5\u002B #40 [31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [31757.547457] RIP: 0010:xsk_sendmsg\u002B0xde/0x180 [31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 \u003C8b\u003E 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f [31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246 [31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000 [31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100 [31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000 [31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa [31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000 [31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000 [31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0 [31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [31757.648139] PKRU: 55555554 [31757.650894] Call Trace: [31757.653385] \u003CTASK\u003E [31757.655524] sock_sendmsg\u002B0x8f/0xa0 [31757.659077] ? sockfd_lookup_light\u002B0x12/0x70 [31757.663416] __sys_sendto\u002B0xfc/0x170 [31757.667051] ? do_sched_setscheduler\u002B0xdb/0x1b0 [31757.671658] __x64_sys_sendto\u002B0x20/0x30 [31757.675557] do_syscall_64\u002B0x38/0x90 [31757.679197] entry_SYSCALL_64_after_hwframe\u002B0x72/0xdc [31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 \u003C48\u003E 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48 [31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16 [31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000 [31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000 [31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [31757.754940] \u003C/TASK\u003E To fix this, let\u0027s make xsk_xmit a function that will be responsible for generic Tx, where RCU is handled accordingly and pull out sanity checks and xs-\u003Ezc handling. Populate sanity checks to __xsk_sendmsg() and xsk_poll().", "published": "2023-03-20T18:27:00Z", "severity": "Moderate", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "cwe": "NULL Pointer Dereference", "epss": 0.00157, "epssPercentile": 0.04897, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-53240", "fixes": [ { "platform": "linux", "product": "bpftool", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "bpftool-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-devel", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-headers", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-libbpf", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-libbpf-devel", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-libbpf-static", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-livepatch-6.1.19-30.43", "release": "amzn 2023", "fixedVersion": "1.0-0.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-tools", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "kernel-tools-devel", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "linux", "release": "Debian 12.15 (bookworm)", "fixedVersion": "6.1.20-1", "fix": "DEBIAN-CVE-2023-53240", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53240", "released": "2025-09-15T15:15:51Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.1.20-1", "fix": "DEBIAN-CVE-2023-53240", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53240", "released": "2025-09-15T15:15:51Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "6.1.20-1", "fix": "DEBIAN-CVE-2023-53240", "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53240", "released": "2025-09-15T15:15:51Z" }, { "platform": "linux", "product": "perf", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "perf-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "python3-perf", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" }, { "platform": "linux", "product": "python3-perf-debuginfo", "release": "amzn 2023", "fixedVersion": "6.1.19-30.43.amzn2023", "fix": "ALAS2023-2023-138", "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138", "released": "2023-03-20T18:27:00Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T13:06:02Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }