{"id":"CVE-2025-21719","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: do not call mr_mfc_uses_dev() for unres entries\n\nsyzbot found that calling mr_mfc_uses_dev() for unres entries\nwould crash [1], because c->mfc_un.res.minvif / c->…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: do not call mr_mfc_uses_dev() for unres entries\n\nsyzbot found that calling mr_mfc_uses_dev() for unres entries\nwould crash [1], because c->mfc_un.res.minvif / c->…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.20, < 5.4.291","linux_kernel >= 5.5, < 5.10.235","linux_kernel >= 5.11, < 5.15.179","linux_kernel >= 5.16, < 6.1.129","linux_kernel >= 6.2, < 6.6.76","linux_kernel >= 6.7, < 6.12.13","linux_kernel >= 6.13, < 6.13.2"],"patched":["linux_kernel 6.13.2"],"published":"2025-02-27","updated":"2026-07-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21719","references":[{"url":"https://git.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfde","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.00208,"epssPercentile":0.11218,"ingestedAt":"2026-07-30T06:53:09.432Z","slug":"CVE-2025-21719","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipmr: do not call mr_mfc_uses_dev() for unres entries\n\nsyzbot found that calling mr_mfc_uses_dev() for unres entries\nwould crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif\nalias to \"struct sk_buff_head unresolved\", which contain two pointers.\n\nThis code never worked, lets remove it.\n\n[1]\nUnable to handle kernel paging request at virtual address ffff5fff2d536613\nKASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f]\nModules linked in:\nCPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline]\n pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334\n lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline]\n lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334\nCall trace:\n  mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P)\n  mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P)\n  mr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382\n  ipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648\n  rtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327\n  rtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791\n  netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317\n  netlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973\n  sock_recvmsg_nosec net/socket.c:1033 [inline]\n  sock_recvmsg net/socket.c:1055 [inline]\n  sock_read_iter+0x2d8/0x40c net/socket.c:1125\n  new_sync_read fs/read_write.c:484 [inline]\n  vfs_read+0x740/0x970 fs/read_write.c:565\n  ksys_read+0x15c/0x26c fs/read_write.c:708\n\n## Affected\n\n- `linux_kernel >= 4.20, < 5.4.291`\n- `linux_kernel >= 5.5, < 5.10.235`\n- `linux_kernel >= 5.11, < 5.15.179`\n- `linux_kernel >= 5.16, < 6.1.129`\n- `linux_kernel >= 6.2, < 6.6.76`\n- `linux_kernel >= 6.7, < 6.12.13`\n- `linux_kernel >= 6.13, < 6.13.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.13.2`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}