ipmr: do not call mr_mfc_uses_dev() for unres entries
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_
CVE-2025-21719
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21719
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "53df27fd38f84bd3cd6b004eb4ff3c4903114f1d",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "547ef7e8cbb98f966c8719a3e15d4e078aaa9b47",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "57177c5f47a8da852f8d76cf6945cf803f8bb9e5",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "b379b3162ff55a70464c6a934ae9bf0497478a62",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "a099834a51ccf9bbba3de86a251b3433539abfde",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "26bb7d991f04eeef47dfad23e533834995c26f7a",
"versionType": "git"
},
{
"status": "affected",
"version": "cb167893f41e21e6bd283d78e53489289dc0592d",
"lessThan": "15a901361ec3fb1c393f91880e1cbf24ec0a88bd",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/ipmr_base.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.76",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.13",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.2",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/ipmr_base.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21719
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30427 · Revision 1
- Added to Heist Feed
- Publisher date