Answer in brief
CVE-2025-21719 records a High severity (CVSS 7.1) vulnerability in ipmr: do not call mr_mfc_uses_dev() for unres entries. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (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 7.1. 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 TM MFP - GNU/Linux subsystem (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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cb167893f41e21e6bd283d78e53489289dc0592d <71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1 || >=cb167893f41e21e6bd283d78e53489289dc0592d <53df27fd38f84bd3cd6b004eb4ff3c4903114f1d || >=cb167893f41e21e6bd283d78e53489289dc0592d <547ef7e8cbb98f966c8719a3e15d4e078aaa9b47 || >=cb167893f41e21e6bd283d78e53489289dc0592d <57177c5f47a8da852f8d76cf6945cf803f8bb9e5 || >=cb167893f41e21e6bd283d78e53489289dc0592d <b379b3162ff55a70464c6a934ae9bf0497478a62 || >=cb167893f41e21e6bd283d78e53489289dc0592d <a099834a51ccf9bbba3de86a251b3433539abfde || >=cb167893f41e21e6bd283d78e53489289dc0592d <26bb7d991f04eeef47dfad23e533834995c26f7a || >=cb167893f41e21e6bd283d78e53489289dc0592d <15a901361ec3fb1c393f91880e1cbf24ec0a88bd | 71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1, 53df27fd38f84bd3cd6b004eb4ff3c4903114f1d, 547ef7e8cbb98f966c8719a3e15d4e078aaa9b47, 57177c5f47a8da852f8d76cf6945cf803f8bb9e5, b379b3162ff55a70464c6a934ae9bf0497478a62, a099834a51ccf9bbba3de86a251b3433539abfde, 26bb7d991f04eeef47dfad23e533834995c26f7a, 15a901361ec3fb1c393f91880e1cbf24ec0a88bd |
| Linux/Linuxgeneric | 4.20 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 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: ipmr: do not call mr_mfc_uses_dev() for unres entries syzbot found that calling mr_mfc_uses_dev() for unres entries would crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif alias to "struct sk_buff_head unresolved", which contain two pointers. This code never worked, lets remove it. [1] Unable to handle kernel paging request at virtual address ffff5fff2d536613 KASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f] Modules linked in: CPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline] lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334 Call trace: mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P) mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P) mr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382 ipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648 rtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327 rtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791 netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317 netlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973 sock_recvmsg_nosec net/socket.c:1033 [inline] sock_recvmsg net/socket.c:1055 [inline] sock_read_iter+0x2d8/0x40c net/socket.c:1125 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x740/0x970 fs/read_write.c:565 ksys_read+0x15c/0x26c fs/read_write.c:708
Quoted source text, attributed separately from HOL analysis.