Critical
u-boot, u-boot-nezha — security advisory
U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.
- Products
- u-boot, u-boot-nezha
- Affected 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, 2016.01+dfsg1-2ubuntu5+esm2, 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-1ubuntu3, 2019.07+dfsg-1ubuntu4~18.04.1, 2019.07+dfsg-1ubuntu5, 2019.07+dfsg-1ubuntu6, 2020.10+dfsg-1ubuntu0~18.04.2, 2020.10+dfsg-1ubuntu0~18.04.3, 2020.10+dfsg-1ubuntu0~18.04.3+esm1, 2020.10+dfsg-1ubuntu0~18.04.3+esm2, 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, 2021.01+dfsg-3ubuntu0~20.04.6+esm2, 2021.07+dfsg-0ubuntu10, 2021.07+dfsg-0ubuntu8, 2021.07+dfsg-0ubuntu9, 2021.09+git20211008.62392d3-0ubuntu1, 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, 2022.01+dfsg-2ubuntu2.9, 2022.04+git20220405.7446a472-0ubuntu0.1, 2022.04+git20220405.7446a472-0ubuntu0.2, 2022.04+git20220405.7446a472-0ubuntu0.3, 2022.04+git20220405.7446a472-0ubuntu0.4, 2022.10-1089-g528ae9bc6c-0ubuntu2, 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, 2024.01~rc1-190-g2e89b706f5-0ubuntu1, 2024.01~rc1-190-g2e89b706f5-0ubuntu2, 2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2, 2025.01-0ubuntu0.24.04.1, 2025.01-0ubuntu0.24.04.2, 2025.01-1~0ubuntu2, 2025.01-3ubuntu1, 2025.01-3ubuntu2, 2025.01-3ubuntu4, 2025.10-0ubuntu0.24.04.1, 2025.10-0ubuntu0.24.04.2, 2025.10-0ubuntu0.24.04.3, 2025.10-0ubuntu0.24.04.4, 2025.10-0ubuntu0.25.10.1, 2025.10-0ubuntu1, 2025.10-0ubuntu2, 2025.10-0ubuntu2.1, 2025.10-0ubuntu2.2, 2025.10-0ubuntu3, 2025.10-0ubuntu4, 2025.10-0ubuntu5, 2025.10-0ubuntu6
- Fixed versions
- Not specified
- CVEs
- CVE-2026-29009
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 16:38 UTC · Revision 1
Source evidence
U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.
osv:UBUNTU-CVE-2026-29009
u-boot
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot-nezha
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot-nezha
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
u-boot
Fixed versions: Not specified
Complete source record
{
"id": "6e73377d9abf786353f7c4229e17692c84e2231581ef0a0148a74541b3df9d06",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-29009",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-29009",
"summary": "U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.",
"evidence": "osv:UBUNTU-CVE-2026-29009",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "2015.04+dfsg1-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "2015.10+dfsg1-3",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
"value": "2018.07~rc3+dfsg1-0ubuntu2~18.04.1",
"evidence": "/affected/1/versions"
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{
"value": "2018.07~rc3+dfsg1-0ubuntu3~18.04.1",
"evidence": "/affected/1/versions"
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{
"value": "2019.07+dfsg-1ubuntu4~18.04.1",
"evidence": "/affected/1/versions"
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{
"value": "2020.10+dfsg-1ubuntu0~18.04.2",
"evidence": "/affected/1/versions"
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{
"value": "2020.10+dfsg-1ubuntu0~18.04.3",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
"name": {
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"affected_versions": [
{
"value": "2019.07+dfsg-1ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "2019.07+dfsg-1ubuntu5",
"evidence": "/affected/2/versions"
},
{
"value": "2019.07+dfsg-1ubuntu6",
"evidence": "/affected/2/versions"
},
{
"value": "2020.10+dfsg-1ubuntu0~20.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "2021.01+dfsg-3ubuntu0~20.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "2021.01+dfsg-3ubuntu0~20.04.3",
"evidence": "/affected/2/versions"
},
{
"value": "2021.01+dfsg-3ubuntu0~20.04.4",
"evidence": "/affected/2/versions"
},
{
"value": "2021.01+dfsg-3ubuntu0~20.04.5",
"evidence": "/affected/2/versions"
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{
"value": "2021.01+dfsg-3ubuntu0~20.04.6",
"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
{
"value": "2021.07+dfsg-0ubuntu8",
"evidence": "/affected/3/versions"
},
{
"value": "2021.07+dfsg-0ubuntu9",
"evidence": "/affected/3/versions"
},
{
"value": "2021.07+dfsg-0ubuntu10",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.1",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.3",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.4",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.5",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.6",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.7",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.8",
"evidence": "/affected/3/versions"
},
{
"value": "2022.01+dfsg-2ubuntu2.9",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "u-boot-nezha",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "2021.09+git20211008.62392d3-0ubuntu1",
"evidence": "/affected/4/versions"
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{
"value": "2022.04+git20220405.7446a472-0ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "2022.04+git20220405.7446a472-0ubuntu0.2",
"evidence": "/affected/4/versions"
},
{
"value": "2022.04+git20220405.7446a472-0ubuntu0.3",
"evidence": "/affected/4/versions"
},
{
"value": "2022.04+git20220405.7446a472-0ubuntu0.4",
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}
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{
"name": {
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"evidence": "/affected/5/package/name"
},
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"affected_versions": [
{
"value": "2023.07+dfsg-1ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu1",
"evidence": "/affected/5/versions"
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{
"value": "2024.01+dfsg-1ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu5",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu5.1",
"evidence": "/affected/5/versions"
},
{
"value": "2024.01+dfsg-1ubuntu5.2",
"evidence": "/affected/5/versions"
},
{
"value": "2025.01-0ubuntu0.24.04.1",
"evidence": "/affected/5/versions"
},
{
"value": "2025.01-0ubuntu0.24.04.2",
"evidence": "/affected/5/versions"
},
{
"value": "2025.10-0ubuntu0.24.04.1",
"evidence": "/affected/5/versions"
},
{
"value": "2025.10-0ubuntu0.24.04.2",
"evidence": "/affected/5/versions"
},
{
"value": "2025.10-0ubuntu0.24.04.3",
"evidence": "/affected/5/versions"
},
{
"value": "2025.10-0ubuntu0.24.04.4",
"evidence": "/affected/5/versions"
}
]
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{
"name": {
"value": "u-boot-nezha",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2022.10-1089-g528ae9bc6c-0ubuntu2",
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},
{
"value": "2024.01~rc1-190-g2e89b706f5-0ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2024.01~rc1-190-g2e89b706f5-0ubuntu2",
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{
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{
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{
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{
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{
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}
]
},
{
"name": {
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},
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{
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},
{
"value": "2025.10-0ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "2025.10-0ubuntu4",
"evidence": "/affected/8/versions"
},
{
"value": "2025.10-0ubuntu5",
"evidence": "/affected/8/versions"
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{
"value": "2025.10-0ubuntu6",
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}
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},
{
"name": {
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{
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{
"value": "2025.10-0ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "2025.10-0ubuntu2",
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},
{
"value": "2025.10-0ubuntu2.1",
"evidence": "/affected/9/versions"
},
{
"value": "2025.10-0ubuntu2.2",
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}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-29009",
"aliases": [
"UBUNTU-CVE-2026-29009"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "u-boot",
"purl": "pkg:deb/ubuntu/u-boot?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"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",
"2016.01+dfsg1-2ubuntu5+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29009.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "u-boot",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-exynos",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-imx",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-omap",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-rockchip",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-rpi",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-sunxi",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-tegra",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
},
{
"binary_name": "u-boot-tools",
"binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "u-boot",
"purl": "pkg:deb/ubuntu/u-boot?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"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",
"2020.10+dfsg-1ubuntu0~18.04.3+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29009.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "u-boot",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-amlogic",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-exynos",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-imx",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-mvebu",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-omap",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-qcom",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-qemu",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-rockchip",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-rpi",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
{
"binary_name": "u-boot-sunxi",
"binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
},
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"modified": "2026-10-21T23:01:54.878631501Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-29009",
"https://www.cve.org/CVERecord?id=CVE-2026-29009"
]
},
"related_cves": [
{
"value": "CVE-2026-29009",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 401054,
"published_at": "2026-07-08T17:17:00+00:00"
}