Answer in brief
CVE-2026-31515 records a Medium severity (CVSS 5.5) vulnerability in af_key: validate families in pfkey_send_migrate(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-31515 records a Medium severity (CVSS 5.5) vulnerability in af_key: validate families in pfkey_send_migrate(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. 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 5.5. 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), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=08de61beab8a21c8e0b3906a97defda5f1f66ece <d0c5aa8dd38887714f1aad04236a3620b56a5e4e || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <e06b596fc4eb01936a2e5dccad17c946d660bab8 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <8ddf8de7e758f6888988467af9ffc8adf589fb16 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <d3225e6b9bd51ec177970a628fe4b11237ce87d5 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <7b18692c59afb8e5c364c8e3ac01e51dd6b52028 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <83f644ea92987c100b82d8481ae2230faeed3d34 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <ee836e820a40e2ca4da8af7310bff92d586772d4 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <eb2d16a7d599dc9d4df391b5e660df9949963786 | d0c5aa8dd38887714f1aad04236a3620b56a5e4e, e06b596fc4eb01936a2e5dccad17c946d660bab8, 8ddf8de7e758f6888988467af9ffc8adf589fb16, d3225e6b9bd51ec177970a628fe4b11237ce87d5, 7b18692c59afb8e5c364c8e3ac01e51dd6b52028, 83f644ea92987c100b82d8481ae2230faeed3d34, ee836e820a40e2ca4da8af7310bff92d586772d4, eb2d16a7d599dc9d4df391b5e660df9949963786 |
| Linux/Linuxgeneric | 2.6.21 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: af_key: validate families in pfkey_send_migrate() syzbot was able to trigger a crash in skb_put() [1] Issue is that pfkey_send_migrate() does not check old/new families, and that set_ipsecrequest() @family argument was truncated, thus possibly overfilling the skb. Validate families early, do not wait set_ipsecrequest(). [1] skbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL> kernel BUG at net/core/skbuff.c:214 ! Call Trace: <TASK> skb_over_panic net/core/skbuff.c:219 [inline] skb_put+0x159/0x210 net/core/skbuff.c:2655 skb_put_zero include/linux/skbuff.h:2788 [inline] set_ipsecrequest net/key/af_key.c:3532 [inline] pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636 km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848 xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705 xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.5. 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), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=08de61beab8a21c8e0b3906a97defda5f1f66ece <d0c5aa8dd38887714f1aad04236a3620b56a5e4e || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <e06b596fc4eb01936a2e5dccad17c946d660bab8 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <8ddf8de7e758f6888988467af9ffc8adf589fb16 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <d3225e6b9bd51ec177970a628fe4b11237ce87d5 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <7b18692c59afb8e5c364c8e3ac01e51dd6b52028 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <83f644ea92987c100b82d8481ae2230faeed3d34 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <ee836e820a40e2ca4da8af7310bff92d586772d4 || >=08de61beab8a21c8e0b3906a97defda5f1f66ece <eb2d16a7d599dc9d4df391b5e660df9949963786 | d0c5aa8dd38887714f1aad04236a3620b56a5e4e, e06b596fc4eb01936a2e5dccad17c946d660bab8, 8ddf8de7e758f6888988467af9ffc8adf589fb16, d3225e6b9bd51ec177970a628fe4b11237ce87d5, 7b18692c59afb8e5c364c8e3ac01e51dd6b52028, 83f644ea92987c100b82d8481ae2230faeed3d34, ee836e820a40e2ca4da8af7310bff92d586772d4, eb2d16a7d599dc9d4df391b5e660df9949963786 |
| Linux/Linuxgeneric | 2.6.21 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: af_key: validate families in pfkey_send_migrate() syzbot was able to trigger a crash in skb_put() [1] Issue is that pfkey_send_migrate() does not check old/new families, and that set_ipsecrequest() @family argument was truncated, thus possibly overfilling the skb. Validate families early, do not wait set_ipsecrequest(). [1] skbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL> kernel BUG at net/core/skbuff.c:214 ! Call Trace: <TASK> skb_over_panic net/core/skbuff.c:219 [inline] skb_put+0x159/0x210 net/core/skbuff.c:2655 skb_put_zero include/linux/skbuff.h:2788 [inline] set_ipsecrequest net/key/af_key.c:3532 [inline] pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636 km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848 xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705 xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150
Quoted source text, attributed separately from HOL analysis.