Answer in brief
CVE-2026-43139 records a High severity (CVSS 8.6) vulnerability in xfrm6: fix uninitialized saddr in xfrm6_get_saddr(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a1e59abf824969554b90facd44a4ab16e265afa4 <4f28141786e1fe884ce42a5197ba9beed540f0ea || >=a1e59abf824969554b90facd44a4ab16e265afa4 <6535867673bf301d52aa00593a4d1d18cc3922fa || >=a1e59abf824969554b90facd44a4ab16e265afa4 <eb2ee15290af14c60b45cf2b73f5687d1d077d9b || >=a1e59abf824969554b90facd44a4ab16e265afa4 <719918fc88df6da023dfff370cd965151a5afd7f || >=a1e59abf824969554b90facd44a4ab16e265afa4 <dc0abce055134cb83b0d981d31ceb20dda419787 || >=a1e59abf824969554b90facd44a4ab16e265afa4 <c7221e7bd8fc2ef38a0b27be580d9d202281306b || >=a1e59abf824969554b90facd44a4ab16e265afa4 <3dcd1664ac15eee6a690daec7c4ffc59190406f7 || >=a1e59abf824969554b90facd44a4ab16e265afa4 <1799d8abeabc68ec05679292aaf6cba93b343c05 | 4f28141786e1fe884ce42a5197ba9beed540f0ea, 6535867673bf301d52aa00593a4d1d18cc3922fa, eb2ee15290af14c60b45cf2b73f5687d1d077d9b, 719918fc88df6da023dfff370cd965151a5afd7f, dc0abce055134cb83b0d981d31ceb20dda419787, c7221e7bd8fc2ef38a0b27be580d9d202281306b, 3dcd1664ac15eee6a690daec7c4ffc59190406f7, 1799d8abeabc68ec05679292aaf6cba93b343c05 |
| Linux/Linuxgeneric | 2.6.19 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.