{ "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-2024-57979", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-57979", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2025-02-27T02:07:06.168Z", "updatedAt": "2026-10-15T01:01:09.232Z", "importedAt": "2026-10-24T01:57:20.494Z", "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": "pps: Fix a use-after-free", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npps: Fix a use-after-free\n\nOn a board running ntpd and gpsd, I'm seeing a consistent use-after-free\nin sys_exit() from gpsd when rebooting:\n\n pps pps1: removed\n ------------[ cut here ]------------\n kobject: '(null)' (00000000db4bec24): is not initialized, yet kobject_put() is being called.\n WARNING: CPU: 2 PID: 440 at lib/kobject.c:734 kobject_put+0x120/0x150\n CPU: 2 UID: 299 PID: 440 Comm: gpsd Not tainted 6.11.0-rc6-00308-gb31c44928842 #1\n Hardware name: Raspberry Pi 4 Model B Rev 1.1 (DT)\n pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : kobject_put+0x120/0x150\n lr : kobject_put+0x120/0x150\n sp : ffffffc0803d3ae0\n x29: ffffffc0803d3ae0 x28: ffffff8042dc9738 x27: 0000000000000001\n x26: 0000000000000000 x25: ffffff8042dc9040 x24: ffffff8042dc9440\n x23: ffffff80402a4620 x22: ffffff8042ef4bd0 x21: ffffff80405cb600\n x20: 000000000008001b x19: ffffff8040b3b6e0 x18: 0000000000000000\n x17: 0000000000000000 x16: 0000000000000000 x15: 696e6920746f6e20\n x14: 7369203a29343263 x13: 205d303434542020 x12: 0000000000000000\n x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000\n x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000\n x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000\n Call trace:\n kobject_put+0x120/0x150\n cdev_put+0x20/0x3c\n __fput+0x2c4/0x2d8\n ____fput+0x1c/0x38\n task_work_run+0x70/0xfc\n do_exit+0x2a0/0x924\n do_group_exit+0x34/0x90\n get_signal+0x7fc/0x8c0\n do_signal+0x128/0x13b4\n do_notify_resume+0xdc/0x160\n el0_svc+0xd4/0xf8\n el0t_64_sync_handler+0x140/0x14c\n el0t_64_sync+0x190/0x194\n ---[ end trace 0000000000000000 ]---\n\n...followed by more symptoms of corruption, with similar stacks:\n\n refcount_t: underflow; use-after-free.\n kernel BUG at lib/list_debug.c:62!\n Kernel panic - not syncing: Oops - BUG: Fatal exception\n\nThis happens because pps_device_destruct() frees the pps_device with the\nembedded cdev immediately after calling cdev_del(), but, as the comment\nabove cdev_del() notes, fops for previously opened cdevs are still\ncallable even after cdev_del() returns. I think this bug has always\nbeen there: I can't explain why it suddenly started happening every time\nI reboot this particular board.\n\nIn commit d953e0e837e6 (\"pps: Fix a use-after free bug when\nunregistering a source.\"), George Spelvin suggested removing the\nembedded cdev. That seems like the simplest way to fix this, so I've\nimplemented his suggestion, using __register_chrdev() with pps_idr\nbecoming the source of truth for which minor corresponds to which\ndevice.\n\nBut now that pps_idr defines userspace visibility instead of cdev_add(),\nwe need to be sure the pps->dev refcount can't reach zero while\nuserspace can still find it again. So, the idr_remove() call moves to\npps_unregister_cdev(), and pps_idr now holds a reference to pps->dev.\n\n pps_core: source serial1 got cdev (251:1)\n <...>\n pps pps1: removed\n pps_core: unregistering pps1\n pps_core: deallocating pps1", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "785c78ed0d39d1717cca3ef931d3e51337b5e90e" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "1a7735ab2cb9747518a7416fb5929e85442dec62" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "c4041b6b0a7a3def8cf3f3d6120ff337bc4c40f7" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "91932db1d96b2952299ce30c1c693d834d10ace6" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "cd3bbcb6b3a7caa5ce67de76723b6d8531fb7f64" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "7e5ee3281dc09014367f5112b6d566ba36ea2d49" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "85241f7de216f8298f6e48540ea13d7dcd100870" }, { "version": "d953e0e837e65ecc1ddaa4f9560f7925878a0de6", "status": "affected", "versionType": "git", "lessThan": "c79a39dc8d060b9e64e8b0fa9d245d44befeefbe" }, { "version": "77327a71f9841b7dfa708195d1cb133d4ef4a989", "status": "affected", "versionType": "git" }, { "version": "cd59fb14918a6b20c1ac8be121fa6397b97b00cb", "status": "affected", "versionType": "git" }, { "version": "49626fbb0360332e40fd76a48cb2ba876d6134ad", "status": "affected", "versionType": "git" }, { "version": "3.2.40", "status": "affected", "versionType": "semver", "lessThan": "3.3" }, { "version": "3.4.87", "status": "affected", "versionType": "semver", "lessThan": "3.5" }, { "version": "3.8.1", "status": "affected", "versionType": "semver", "lessThan": "3.9" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.9" }, { "version": "5.4.291", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.235", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.179", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.129", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.76", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.13.*" }, { "version": "6.14", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }