xfrm6: fix uninitialized saddr in xfrm6_get_saddr()
In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in xfrm6_get_saddr() xfrm6_get_saddr() does not check the return value of ipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable source address (returns -EADDRNOTAVAIL), saddr->in6 is left uninitialized, but xfrm6_get_saddr() still returns 0 (success). This causes the caller xfrm_tmpl_resolve_one() to use the uninitialized address in xfrm_state_find(), triggering KMSAN warning: ===================================================== BUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940 xfrm_state_find+0x2424/0xa940 xfrm_resolve_and_create_bundle+0x906/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 xfrm_lookup_route+0x63/0x2b0 ip_route_output_flow+0x1ce/0x270 udp_sendmsg+0x2ce1/0x3400 inet_sendmsg+0x1ef/0x2a0 __sock_sendmsg+0x278/0x3d0 __sys_sendto+0x593/0x720 __x64_sys_sendto+0x130/0x200 x64_sys_call+0x332b/0x3e70 do_syscall_64+0xd3/0xf80 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable tmp.i.i created at: xfrm_resolve_and_create_bundle+0x3e3/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 ===================================================== Fix by checking the return value of ipv6_dev_get_saddr() and propagating the error.
CVE-2026-43139
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-2026-43139
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": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "4f28141786e1fe884ce42a5197ba9beed540f0ea",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "6535867673bf301d52aa00593a4d1d18cc3922fa",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "eb2ee15290af14c60b45cf2b73f5687d1d077d9b",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "719918fc88df6da023dfff370cd965151a5afd7f",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "dc0abce055134cb83b0d981d31ceb20dda419787",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "c7221e7bd8fc2ef38a0b27be580d9d202281306b",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "3dcd1664ac15eee6a690daec7c4ffc59190406f7",
"versionType": "git"
},
{
"status": "affected",
"version": "a1e59abf824969554b90facd44a4ab16e265afa4",
"lessThan": "1799d8abeabc68ec05679292aaf6cba93b343c05",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/xfrm6_policy.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.252",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/xfrm6_policy.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43139
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40034 · Revision 1
- Added to Heist Feed
- Publisher date