{ "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-2026-43249", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43249", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-05-06T11:28:40.290Z", "updatedAt": "2026-10-21T12:40:24.296Z", "importedAt": "2026-10-24T01:58:14.884Z", "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": "9p/xen: protect xen_9pfs_front_free against concurrent calls", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p/xen: protect xen_9pfs_front_free against concurrent calls\n\nThe xenwatch thread can race with other back-end change notifications\nand call xen_9pfs_front_free() twice, hitting the observed general\nprotection fault due to a double-free. Guard the teardown path so only\none caller can release the front-end state at a time, preventing the\ncrash.\n\nThis is a fix for the following double-free:\n\n[ 27.052347] Oops: general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b6b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 27.052357] CPU: 0 UID: 0 PID: 32 Comm: xenwatch Not tainted 6.18.0-02087-g51ab33fc0a8b-dirty #60 PREEMPT(none)\n[ 27.052363] RIP: e030:xen_9pfs_front_free+0x1d/0x150\n[ 27.052368] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 48 89 fd 48 c7 c7 48 d0 92 85 53 e8 cb cb 05 00 48 8b 45 08 48 8b 55 00 <48> 3b 28 0f 85 f9 28 35 fe 48 3b 6a 08 0f 85 ef 28 35 fe 48 89 42\n[ 27.052377] RSP: e02b:ffffc9004016fdd0 EFLAGS: 00010246\n[ 27.052381] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88800d66e400 RCX: 0000000000000000\n[ 27.052385] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000000 RDI: 0000000000000000\n[ 27.052389] RBP: ffff88800a887040 R08: 0000000000000000 R09: 0000000000000000\n[ 27.052393] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888009e46b68\n[ 27.052397] R13: 0000000000000200 R14: 0000000000000000 R15: ffff88800a887040\n[ 27.052404] FS: 0000000000000000(0000) GS:ffff88808ca57000(0000) knlGS:0000000000000000\n[ 27.052408] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 27.052412] CR2: 00007f9714004360 CR3: 0000000004834000 CR4: 0000000000050660\n[ 27.052418] Call Trace:\n[ 27.052420] \n[ 27.052422] xen_9pfs_front_changed+0x5d5/0x720\n[ 27.052426] ? xenbus_otherend_changed+0x72/0x140\n[ 27.052430] ? __pfx_xenwatch_thread+0x10/0x10\n[ 27.052434] xenwatch_thread+0x94/0x1c0\n[ 27.052438] ? __pfx_autoremove_wake_function+0x10/0x10\n[ 27.052442] kthread+0xf8/0x240\n[ 27.052445] ? __pfx_kthread+0x10/0x10\n[ 27.052449] ? __pfx_kthread+0x10/0x10\n[ 27.052452] ret_from_fork+0x16b/0x1a0\n[ 27.052456] ? __pfx_kthread+0x10/0x10\n[ 27.052459] ret_from_fork_asm+0x1a/0x30\n[ 27.052463] \n[ 27.052465] Modules linked in:\n[ 27.052471] ---[ end trace 0000000000000000 ]---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "status": "affected", "versionType": "git", "lessThan": "480aa6ffd4ac7036eea042047d0cca71bc2074bb" }, { "version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "status": "affected", "versionType": "git", "lessThan": "a5d00dff97118a32fcf5fec7a4c3f864c4620c4e" }, { "version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "status": "affected", "versionType": "git", "lessThan": "59e7707492576bdbfa8c1dbe7d90791df31e4773" }, { "version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "status": "affected", "versionType": "git", "lessThan": "bf841d43f7a33d75675ba7f4e214ac1c67913065" }, { "version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "status": "affected", "versionType": "git", "lessThan": "ce8ded2e61f47747e31eeefb44dc24a2160a7e32" }, { "version": "be03c4fe72384366fd4077a70966bd3b8fc49013", "status": "affected", "versionType": "git" }, { "version": "1ab4de11232e83b875b071aa44d1155634ca8a1e", "status": "affected", "versionType": "git" }, { "version": "7cc9dbae8a5f73bd555130384ea256018d28f283", "status": "affected", "versionType": "git" }, { "version": "3e0359f151ac151abe3fa71040e450ed69cb824b", "status": "affected", "versionType": "git" }, { "version": "8d3fc907d060c4fb33203e616a395a22083b6566", "status": "affected", "versionType": "git" }, { "version": "4f0e9244770f5b75a16d8c0929063cd336926764", "status": "affected", "versionType": "git" }, { "version": "5f6a8974e9ef317fe63f88bab1f33070195dd147", "status": "affected", "versionType": "git" }, { "version": "4.14.308", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.276", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.235", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.10.173", "status": "affected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.15.100", "status": "affected", "versionType": "semver", "lessThan": "5.16" }, { "version": "6.1.18", "status": "affected", "versionType": "semver", "lessThan": "6.2" }, { "version": "6.2.5", "status": "affected", "versionType": "semver", "lessThan": "6.3" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.3" }, { "version": "6.6.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }