{ "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-2023-53667", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53667", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-10-07T15:21:25.185Z", "updatedAt": "2026-05-11T19:49:35.341Z", "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": "net: cdc_ncm: Deal with too low values of dwNtbOutMaxSize", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cdc_ncm: Deal with too low values of dwNtbOutMaxSize\n\nCurrently in cdc_ncm_check_tx_max(), if dwNtbOutMaxSize is lower than\nthe calculated \"min\" value, but greater than zero, the logic sets\ntx_max to dwNtbOutMaxSize. This is then used to allocate a new SKB in\ncdc_ncm_fill_tx_frame() where all the data is handled.\n\nFor small values of dwNtbOutMaxSize the memory allocated during\nalloc_skb(dwNtbOutMaxSize, GFP_ATOMIC) will have the same size, due to\nhow size is aligned at alloc time:\n\tsize = SKB_DATA_ALIGN(size);\n size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));\nThus we hit the same bug that we tried to squash with\ncommit 2be6d4d16a084 (\"net: cdc_ncm: Allow for dwNtbOutMaxSize to be unset or zero\")\n\nLow values of dwNtbOutMaxSize do not cause an issue presently because at\nalloc_skb() time more memory (512b) is allocated than required for the\nSKB headers alone (320b), leaving some space (512b - 320b = 192b)\nfor CDC data (172b).\n\nHowever, if more elements (for example 3 x u64 = [24b]) were added to\none of the SKB header structs, say 'struct skb_shared_info',\nincreasing its original size (320b [320b aligned]) to something larger\n(344b [384b aligned]), then suddenly the CDC data (172b) no longer\nfits in the spare SKB data area (512b - 384b = 128b).\n\nConsequently the SKB bounds checking semantics fails and panics:\n\nskbuff: skb_over_panic: text:ffffffff831f755b len:184 put:172 head:ffff88811f1c6c00 data:ffff88811f1c6c00 tail:0xb8 end:0x80 dev:\n------------[ cut here ]------------\nkernel BUG at net/core/skbuff.c:113!\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN\nCPU: 0 PID: 57 Comm: kworker/0:2 Not tainted 5.15.106-syzkaller-00249-g19c0ed55a470 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023\nWorkqueue: mld mld_ifc_work\nRIP: 0010:skb_panic net/core/skbuff.c:113 [inline]\nRIP: 0010:skb_over_panic+0x14c/0x150 net/core/skbuff.c:118\n[snip]\nCall Trace:\n \n skb_put+0x151/0x210 net/core/skbuff.c:2047\n skb_put_zero include/linux/skbuff.h:2422 [inline]\n cdc_ncm_ndp16 drivers/net/usb/cdc_ncm.c:1131 [inline]\n cdc_ncm_fill_tx_frame+0x11ab/0x3da0 drivers/net/usb/cdc_ncm.c:1308\n cdc_ncm_tx_fixup+0xa3/0x100\n\nDeal with too low values of dwNtbOutMaxSize, clamp it in the range\n[USB_CDC_NCM_NTB_MIN_OUT_SIZE, CDC_NCM_NTB_MAX_SIZE_TX]. We ensure\nenough data space is allocated to handle CDC data by making sure\ndwNtbOutMaxSize is not smaller than USB_CDC_NCM_NTB_MIN_OUT_SIZE.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "2334ff0b343ba6ba7a6c0586fcc83992bbbc1776" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "bf415bfe7573596ac213b4fd1da9e62cfc9a9413" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "ff484163dfb61b58f23e4dbd007de1094427669c" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "42b78c8cc774b47023d6d16d96d54cc7015e4a07" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "9be921854e983a81a0aeeae5febcd87093086e46" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "6147745d43ff4e0d2c542e5b93e398ef0ee4db00" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "72d0240b0ee4794efc683975c213e4b384fea733" }, { "version": "289507d3364f96f4b8814726917d572f71350d87", "status": "affected", "versionType": "git", "lessThan": "7e01c7f7046efc2c7c192c3619db43292b98e997" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.16", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.16" }, { "version": "4.14.317", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.285", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.245", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.181", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.114", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.31", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.3.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.3.*" }, { "version": "6.4", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }