CVE-2025-21719: linux Out-of-bounds Read
Vulnerability summary
CVE-2025-21719 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 51 · Related 50Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
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
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
0.00 pp
From 0.20% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu132 products
- linux< 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-64.67
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1032.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1 | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 53df27fd38f84bd3cd6b004eb4ff3c4903114f1d | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 547ef7e8cbb98f966c8719a3e15d4e078aaa9b47 | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 57177c5f47a8da852f8d76cf6945cf803f8bb9e5 | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < b379b3162ff55a70464c6a934ae9bf0497478a62 | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < a099834a51ccf9bbba3de86a251b3433539abfde | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 26bb7d991f04eeef47dfad23e533834995c26f7a | ≥ cb167893f41e21e6bd283d78e53489289dc0592d, < 15a901361ec3fb1c393f91880e1cbf24ec0a88bd | 4.20
- linux_kernel≥ 4.20, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.76 | ≥ 6.7, < 6.12.13 | ≥ 6.13, < 6.13.2
Debian1 product
- linux< 6.1.129-1 | < 6.12.13-1
3 vendors · 135 products
