{"id":"CVE-2026-74221","aliases":["AZL-105702","DEBIAN-CVE-2026-74221","EUVD-2026-89434","GHSA-r9ch-9wx4-f978","OESA-2026-4735","OESA-2026-4736","OESA-2026-4737","OESA-2026-4844","UBUNTU-CVE-2026-74221","USN-8930-1","USN-8930-2"],"status":"published","title":"U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","severity":{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00339,"percentile":0.27744,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-195"],"published":"2026-09-29T21:29:23Z","modified":"2026-11-11T12:45:12Z","fixes":[{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"u-boot","fixed_in":["2016.01+dfsg1-2ubuntu5+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"u-boot","fixed_in":["2020.10+dfsg-1ubuntu0~18.04.3+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"u-boot","fixed_in":["2021.01+dfsg-3ubuntu0~20.04.6+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"u-boot","fixed_in":["2022.01+dfsg-2ubuntu2.9"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"u-boot","fixed_in":["2025.10-0ubuntu0.24.04.4"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.10","package":"u-boot","fixed_in":["2025.10-0ubuntu6"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.04:LTS","package":"u-boot","fixed_in":["2025.10-0ubuntu2.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"10.1.0-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2023.01+dfsg-2","2023.01+dfsg-2+deb12u1","2023.01+dfsg-2+deb12u2","2023.01+dfsg-2+deb12u3","2023.04+dfsg-1","2023.04~rc2+dfsg-1","2023.04~rc5+dfsg-1","2023.07+dfsg-1","2023.07~rc4+dfsg-1","2023.07~rc5+dfsg-1","2024.01+dfsg-1","2024.01+dfsg-2","2024.01+dfsg-3","2024.01+dfsg-4","2024.01+dfsg-5","2024.01+dfsg-6","2024.01+dfsg-7","2024.01~rc6+dfsg-1","2024.01~rc6+dfsg-2","2025.01-1","2025.01-2","2025.01-3","2025.01-3.1","2025.01-3.2"]},{"source":"osv","ecosystem":"Debian:13","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2025.01-3","2025.01-3+deb13u1","2025.01-3.1","2025.01-3.2"]},{"source":"osv","ecosystem":"Debian:14","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2025.01-3","2025.01-3.1","2025.01-3.2"]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"uboot-tools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2024.01-6.oe2403sp1"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP3","package":"uboot-tools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2024.01-6.oe2403sp3"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP4","package":"uboot-tools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2021.10-14.oe2203sp4"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP4","package":"uboot-tools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2024.01-7.oe2403sp4"}]}],"bundled":5},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.01+dfsg1-2ubuntu5+esm2"}]}],"versions":["2015.04+dfsg1-2ubuntu1","2015.10+dfsg1-2","2015.10+dfsg1-3","2015.10+dfsg1-4","2016.01+dfsg1-1","2016.01+dfsg1-1ubuntu1","2016.01+dfsg1-2ubuntu1","2016.01+dfsg1-2ubuntu2","2016.01+dfsg1-2ubuntu3","2016.01+dfsg1-2ubuntu5","2016.01+dfsg1-2ubuntu5+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.10+dfsg-1ubuntu0~18.04.3+esm2"}]}],"versions":["2016.03+dfsg1-6ubuntu2","2018.07~rc3+dfsg1-0ubuntu1~18.04.1","2018.07~rc3+dfsg1-0ubuntu2~18.04.1","2018.07~rc3+dfsg1-0ubuntu3~18.04.1","2019.07+dfsg-1ubuntu4~18.04.1","2020.10+dfsg-1ubuntu0~18.04.2","2020.10+dfsg-1ubuntu0~18.04.3","2020.10+dfsg-1ubuntu0~18.04.3+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2021.01+dfsg-3ubuntu0~20.04.6+esm2"}]}],"versions":["2019.07+dfsg-1ubuntu3","2019.07+dfsg-1ubuntu5","2019.07+dfsg-1ubuntu6","2020.10+dfsg-1ubuntu0~20.04.2","2021.01+dfsg-3ubuntu0~20.04.1","2021.01+dfsg-3ubuntu0~20.04.3","2021.01+dfsg-3ubuntu0~20.04.4","2021.01+dfsg-3ubuntu0~20.04.5","2021.01+dfsg-3ubuntu0~20.04.6","2021.01+dfsg-3ubuntu0~20.04.6+esm1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.01+dfsg-2ubuntu2.9"}]}],"versions":["2021.07+dfsg-0ubuntu8","2021.07+dfsg-0ubuntu9","2021.07+dfsg-0ubuntu10","2022.01+dfsg-2ubuntu1","2022.01+dfsg-2ubuntu2","2022.01+dfsg-2ubuntu2.1","2022.01+dfsg-2ubuntu2.3","2022.01+dfsg-2ubuntu2.4","2022.01+dfsg-2ubuntu2.5","2022.01+dfsg-2ubuntu2.6","2022.01+dfsg-2ubuntu2.7","2022.01+dfsg-2ubuntu2.8"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"u-boot-nezha","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2021.09+git20211008.62392d3-0ubuntu1","2022.04+git20220405.7446a472-0ubuntu0.1","2022.04+git20220405.7446a472-0ubuntu0.2","2022.04+git20220405.7446a472-0ubuntu0.3","2022.04+git20220405.7446a472-0ubuntu0.4"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu0.24.04.4"}]}],"versions":["2023.07+dfsg-1ubuntu2","2024.01+dfsg-1ubuntu1","2024.01+dfsg-1ubuntu2","2024.01+dfsg-1ubuntu3","2024.01+dfsg-1ubuntu4","2024.01+dfsg-1ubuntu5","2024.01+dfsg-1ubuntu5.1","2024.01+dfsg-1ubuntu5.2","2025.01-0ubuntu0.24.04.1","2025.01-0ubuntu0.24.04.2","2025.10-0ubuntu0.24.04.1","2025.10-0ubuntu0.24.04.2","2025.10-0ubuntu0.24.04.3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"u-boot-nezha","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2022.10-1089-g528ae9bc6c-0ubuntu2","2024.01~rc1-190-g2e89b706f5-0ubuntu1","2024.01~rc1-190-g2e89b706f5-0ubuntu2","2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu6"}]}],"versions":["2025.10-0ubuntu2","2025.10-0ubuntu3","2025.10-0ubuntu4","2025.10-0ubuntu5"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu2.2"}]}],"versions":["2025.01-3ubuntu4","2025.10-0ubuntu1","2025.10-0ubuntu2","2025.10-0ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.01+dfsg1-2ubuntu5+esm2"}]}],"versions":["2015.04+dfsg1-2ubuntu1","2015.10+dfsg1-2","2015.10+dfsg1-3","2015.10+dfsg1-4","2016.01+dfsg1-1","2016.01+dfsg1-1ubuntu1","2016.01+dfsg1-2ubuntu1","2016.01+dfsg1-2ubuntu2","2016.01+dfsg1-2ubuntu3","2016.01+dfsg1-2ubuntu5","2016.01+dfsg1-2ubuntu5+esm1"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.10+dfsg-1ubuntu0~18.04.3+esm2"}]}],"versions":["2016.03+dfsg1-6ubuntu2","2018.07~rc3+dfsg1-0ubuntu1~18.04.1","2018.07~rc3+dfsg1-0ubuntu2~18.04.1","2018.07~rc3+dfsg1-0ubuntu3~18.04.1","2019.07+dfsg-1ubuntu4~18.04.1","2020.10+dfsg-1ubuntu0~18.04.2","2020.10+dfsg-1ubuntu0~18.04.3","2020.10+dfsg-1ubuntu0~18.04.3+esm1"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2021.01+dfsg-3ubuntu0~20.04.6+esm2"}]}],"versions":["2019.07+dfsg-1ubuntu3","2019.07+dfsg-1ubuntu5","2019.07+dfsg-1ubuntu6","2020.10+dfsg-1ubuntu0~20.04.2","2021.01+dfsg-3ubuntu0~20.04.1","2021.01+dfsg-3ubuntu0~20.04.3","2021.01+dfsg-3ubuntu0~20.04.4","2021.01+dfsg-3ubuntu0~20.04.5","2021.01+dfsg-3ubuntu0~20.04.6","2021.01+dfsg-3ubuntu0~20.04.6+esm1"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.01+dfsg-2ubuntu2.9"}]}],"versions":["2021.07+dfsg-0ubuntu8","2021.07+dfsg-0ubuntu9","2021.07+dfsg-0ubuntu10","2022.01+dfsg-2ubuntu1","2022.01+dfsg-2ubuntu2","2022.01+dfsg-2ubuntu2.1","2022.01+dfsg-2ubuntu2.3","2022.01+dfsg-2ubuntu2.4","2022.01+dfsg-2ubuntu2.5","2022.01+dfsg-2ubuntu2.6","2022.01+dfsg-2ubuntu2.7","2022.01+dfsg-2ubuntu2.8"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu0.24.04.4"}]}],"versions":["2023.07+dfsg-1ubuntu2","2024.01+dfsg-1ubuntu1","2024.01+dfsg-1ubuntu2","2024.01+dfsg-1ubuntu3","2024.01+dfsg-1ubuntu4","2024.01+dfsg-1ubuntu5","2024.01+dfsg-1ubuntu5.1","2024.01+dfsg-1ubuntu5.2","2025.01-0ubuntu0.24.04.1","2025.01-0ubuntu0.24.04.2","2025.10-0ubuntu0.24.04.1","2025.10-0ubuntu0.24.04.2","2025.10-0ubuntu0.24.04.3"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu2.2"}]}],"versions":["2025.01-3ubuntu4","2025.10-0ubuntu1","2025.10-0ubuntu2","2025.10-0ubuntu2.1"],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"u-boot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu6"}]}],"versions":["2025.10-0ubuntu2","2025.10-0ubuntu3","2025.10-0ubuntu4","2025.10-0ubuntu5"],"bundled":4}],"products":[{"vendor":"denx software engineering","product":"u-boot"},{"vendor":"u-boot","product":"u-boot"}],"references":[{"url":"https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd","tags":["patch","fix","report"]},{"url":"https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643","tags":["technical-description","article","report"]},{"url":"https://github.com/u-boot/u-boot","tags":["product","package","report"]},{"url":"https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74221","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-r9ch-9wx4-f978"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74221.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-74221","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4735","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74220","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4736","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4737","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4844","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71971","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71972","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71973","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-74221","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74221","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8930-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8930-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-74220","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-74222","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-74225","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-74221","title":"U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T21:29:23.283Z","modified":"2026-09-30T13:47:56.756Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-195"],"updated_at":"2026-11-02T14:20:03.4818Z"}],"euvd":[{"id":"EUVD-2026-89434","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T21:29:23Z","modified":"2026-09-30T13:47:56Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:49.499669Z"}],"ghsa":[{"id":"GHSA-r9ch-9wx4-f978","title":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs...","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-30T00:32:29Z","modified":"2026-09-30T00:32:30Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"cwes":["CWE-195"],"updated_at":"2026-11-02T15:12:35.132592Z"}],"nvd":[{"id":"CVE-2026-74221","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T22:18:33.493Z","modified":"2026-09-30T16:40:50.56Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-195"],"updated_at":"2026-11-02T14:12:52.759595Z"}],"osv":[{"id":"CVE-2026-74221","title":"U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T21:29:23.283Z","modified":"2026-10-28T11:23:09.57802399Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-195"],"updated_at":"2026-11-02T15:45:16.365946Z"},{"id":"DEBIAN-CVE-2026-74221","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T22:18:33.493Z","modified":"2026-10-01T09:00:54.47951121Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:46:02.499355Z"},{"id":"OESA-2026-4735","title":"uboot-tools security update","description":"This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot\u0026amp;apos;s environment.\r\n\r\nSecurity Fix(es):\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.(CVE-2026-74220)\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.(CVE-2026-74221)","status":"published","published":"2026-11-04T13:55:04Z","modified":"2026-11-04T14:00:07.832680964Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4736","title":"uboot-tools security update","description":"This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot\u0026amp;apos;s environment.\r\n\r\nSecurity Fix(es):\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.(CVE-2026-74220)\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.(CVE-2026-74221)","status":"published","published":"2026-11-04T13:55:04Z","modified":"2026-11-04T14:00:07.834389226Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4737","title":"uboot-tools security update","description":"This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot\u0026amp;apos;s environment.\r\n\r\nSecurity Fix(es):\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.(CVE-2026-74220)\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.(CVE-2026-74221)","status":"published","published":"2026-11-04T13:55:05Z","modified":"2026-11-04T14:00:07.935999741Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4844","title":"uboot-tools security update","description":"This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot\u0026amp;apos;s environment.\r\n\r\nSecurity Fix(es):\n\nU-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netboot to corrupt adjacent memory and crash the bootloader.(CVE-2026-71971)\n\nU-Boot through 2026.10-rc5 contains an out-of-bounds write vulnerability in the video_display_rle8_bitmap function in drivers/video/video_bmp.c. Attackers can supply a crafted RLE8-compressed BMP image to corrupt memory adjacent to the framebuffer and crash the bootloader.(CVE-2026-71972)\n\nU-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.(CVE-2026-71973)\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.(CVE-2026-74220)\n\nU-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.(CVE-2026-74221)","status":"published","published":"2026-11-11T12:26:46Z","modified":"2026-11-11T12:45:12.272133215Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"UBUNTU-CVE-2026-74221","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T22:18:00Z","modified":"2026-10-21T23:11:56.07219104Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"},{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:08.628462Z"},{"id":"AZL-105702","title":"CVE-2026-74221 affecting package qemu 10.1.0-1","description":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.","status":"published","published":"2026-09-29T22:18:33Z","modified":"2026-10-15T05:37:09Z","updated_at":"2026-11-02T15:28:01.09948Z"},{"id":"USN-8930-1","title":"u-boot vulnerabilities","description":"Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot\nincorrectly handled certain NFS READ and NFS READLINK responses. An\nattacker could possibly use this issue to trigger a buffer overflow,\nresulting in a denial of service or arbitrary code execution.\n(CVE-2026-74220, CVE-2026-74221)\n\nShahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot\nincorrectly handled certain HTTP data storage failures in its lwIP\nimplementation. An attacker could possibly use this issue to trigger a\nuse-after-free, resulting in a denial of service. This issue only\naffected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-74222)\n\nShahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot did not\nproperly validate certain DHCPv6 option lengths during network boot. An\nattacker could possibly use this issue to trigger out-of-bounds memory\naccess, resulting in a denial of service. This issue only affected\nUbuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-74225)","status":"published","published":"2026-10-14T16:23:58Z","modified":"2026-10-17T13:11:53.933670443Z","updated_at":"2026-11-02T16:58:26.907654Z"},{"id":"USN-8930-2","title":"u-boot vulnerabilities","description":"USN-8930-1 fixed some vulnerabilities in U-Boot. This update provides the\ncorresponding fix for U-Boot on Ubuntu 26.10.\n\nOriginal advisory details:\n\n Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot\nincorrectly handled certain NFS READ and NFS READLINK responses. An\nattacker could possibly use this issue to trigger a buffer overflow,\nresulting in a denial of service or arbitrary code execution.\n(CVE-2026-74220, CVE-2026-74221)\n\n Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot\nincorrectly handled certain HTTP data storage failures in its lwIP\nimplementation. An attacker could possibly use this issue to trigger a\nuse-after-free, resulting in a denial of service. (CVE-2026-74222)\n\n Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot did not\nproperly validate certain DHCPv6 option lengths during network boot. An\nattacker could possibly use this issue to trigger out-of-bounds memory\naccess, resulting in a denial of service. (CVE-2026-74225)","status":"published","published":"2026-10-21T15:57:11Z","modified":"2026-10-21T23:13:03.440289031Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}