rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()
In the Linux kernel, the following vulnerability has been resolved: rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check() rds_tcp_laddr_check() looks up a scoped IPv6 interface with dev_get_by_index_rcu(), drops the RCU read-side lock, and only then passes the bare struct net_device * into ipv6_chk_addr(). dev_get_by_index_rcu() only keeps the device alive within the same RCU read-side section. After rcu_read_unlock(), a concurrent RTM_DELLINK can free the net_device; ipv6_chk_addr() then dereferences the stale pointer in __ipv6_chk_addr_and_flags() (e.g. l3mdev_master_dev_rcu(dev)), reading freed memory. Keep the RCU read-side lock held across the ipv6_chk_addr() call instead of dropping it right after the lookup, so the device cannot be freed while it is in use. BUG: KASAN: slab-use-after-free in __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) Read of size 8 at addr ffff8880106ec000 by task exploit/153 Call Trace: ... kasan_report (mm/kasan/report.c:595) __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) ipv6_chk_addr (net/ipv6/addrconf.c:2031 net/ipv6/addrconf.c:1972) rds_tcp_laddr_check (net/rds/tcp.c:370) rds_bind (net/rds/bind.c:248) __sys_bind (net/socket.c:1920) __x64_sys_bind (net/socket.c:1956) do_syscall_64 (arch/x86/entry/syscall_64.c:63) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
CVE-2026-74563
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74563
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "f8a8977af2134a1d91e5f9773cb7d9d53278c830",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "ba95bce5dfe6e2ef602a87e0557225f2934ccb5c",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "c4933624a6f416ecfcc31ab58d585da1207a0597",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "b1d480fce05f857dc438080cd8c9244b84a83494",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "8398bc477d3cb3e2b018a5aaac2bec0f69acda30",
"versionType": "git"
},
{
"status": "affected",
"version": "eee2fa6ab3225192d6d894c54a6fb02ac9efdff6",
"lessThan": "78f75d632f74b8de0f081a128588f7c37d0d1164",
"versionType": "git"
}
],
"programFiles": [
"net/rds/tcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/rds/tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74563
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33207 · Revision 1
- Added to Heist Feed
- Publisher date