{ "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-2023-53240", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53240", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-09-15T14:22:14.241Z", "updatedAt": "2026-05-23T15:28:23.218Z", "importedAt": "2026-10-24T01:57:03.413Z", "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": "xsk: check IFF_UP earlier in Tx path", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: check IFF_UP earlier in Tx path\n\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\ntwo paths share a call to common function xsk_xmit() which has two\nsanity checks within. A pseudo code example to show the two paths:\n\n__xsk_sendmsg() : xsk_poll():\nif (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs)))\n return -ENXIO; return mask;\nif (unlikely(need_wait)) (...)\n return -EOPNOTSUPP; xsk_xmit()\nmark napi id\n(...)\nxsk_xmit()\n\nxsk_xmit():\nif (unlikely(!(xs->dev->flags & IFF_UP)))\n\treturn -ENETDOWN;\nif (unlikely(!xs->tx))\n\treturn -ENOBUFS;\n\nAs it can be observed above, in sendmsg() napi id can be marked on\ninterface that was not brought up and this causes a NULL ptr\ndereference:\n\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\n[31757.512710] #PF: supervisor read access in kernel mode\n[31757.517936] #PF: error_code(0x0000) - not-present page\n[31757.523149] PGD 0 P4D 0\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\n[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 <8b> 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\n[31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\n[31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[31757.648139] PKRU: 55555554\n[31757.650894] Call Trace:\n[31757.653385] \n[31757.655524] sock_sendmsg+0x8f/0xa0\n[31757.659077] ? sockfd_lookup_light+0x12/0x70\n[31757.663416] __sys_sendto+0xfc/0x170\n[31757.667051] ? do_sched_setscheduler+0xdb/0x1b0\n[31757.671658] __x64_sys_sendto+0x20/0x30\n[31757.675557] do_syscall_64+0x38/0x90\n[31757.679197] entry_SYSCALL_64_after_hwframe+0x72/0xdc\n[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 <48> 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n[31757.754940] \n\nTo fix this, let's make xsk_xmit a function that will be responsible for\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\nand xs->zc handling. Populate sanity checks to __xsk_sendmsg() and\nxsk_poll().", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21", "status": "affected", "versionType": "git", "lessThan": "cecc68559cd57fffb2be50685f262b9af2318e16" }, { "version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21", "status": "affected", "versionType": "git", "lessThan": "ffe19750e68d0bb21e8110b398346eef20b156a7" }, { "version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21", "status": "affected", "versionType": "git", "lessThan": "1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b" }, { "version": "ad7219cd8751bd258b9d1e69ae0654ec00f71875", "status": "affected", "versionType": "git" }, { "version": "d1579253ffce39986e7a6ab757ac93b2680a665f", "status": "affected", "versionType": "git" }, { "version": "8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9", "status": "affected", "versionType": "git" }, { "version": "5.15.33", "status": "affected", "versionType": "semver", "lessThan": "5.16" }, { "version": "5.16.19", "status": "affected", "versionType": "semver", "lessThan": "5.17" }, { "version": "5.17.2", "status": "affected", "versionType": "semver", "lessThan": "5.18" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.18" }, { "version": "6.1.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.2.*" }, { "version": "6.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }