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CVE-2025-21719 (GCVE-0-2025-21719)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:07 – Updated: 2026-08-05 11:53
VLAI
Title
ipmr: do not call mr_mfc_uses_dev() for unres entries
Summary
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
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1 (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 53df27fd38f84bd3cd6b004eb4ff3c4903114f1d (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 547ef7e8cbb98f966c8719a3e15d4e078aaa9b47 (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 57177c5f47a8da852f8d76cf6945cf803f8bb9e5 (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < b379b3162ff55a70464c6a934ae9bf0497478a62 (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < a099834a51ccf9bbba3de86a251b3433539abfde (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 26bb7d991f04eeef47dfad23e533834995c26f7a (git)
Affected: cb167893f41e21e6bd283d78e53489289dc0592d , < 15a901361ec3fb1c393f91880e1cbf24ec0a88bd (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.76 , ≤ 6.6.* (semver)
Unaffected: 6.12.13 , ≤ 6.12.* (semver)
Unaffected: 6.13.2 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21719\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T02:15:15.580\",\"lastModified\":\"2026-07-30T06:20:39.593\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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-\u003emfc_un.res.minvif / c-\u003emfc_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\"},{\"lang\":\"es\",\"value\":\"En el n\u00facleo de Linux, se ha resuelto la siguiente vulnerabilidad: ipmr: no llamar a mr_mfc_uses_dev() para entradas no resueltas syzbot descubri\u00f3 que llamar a mr_mfc_uses_dev() para entradas no resueltas provocar\u00eda un bloqueo [1], porque c-\u0026gt;mfc_un.res.minvif / c-\u0026gt;mfc_un.res.maxvif son alias de \\\"struct sk_buff_head unresolved\\\", que contienen dos punteros. Este c\u00f3digo nunca funcion\u00f3, elimin\u00e9moslo. [1] No se puede manejar la solicitud de paginaci\u00f3n del kernel en la direcci\u00f3n virtual ffff5fff2d536613 KASAN: tal vez un acceso a memoria salvaje en el rango [0xfffefff96a9b3098-0xfffefff96a9b309f] M\u00f3dulos vinculados: CPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 No contaminado 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [en l\u00ednea] pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [en l\u00ednea] lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334 Rastreo de llamadas: mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [en l\u00ednea] (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 [en l\u00ednea] sock_recvmsg net/socket.c:1055 [en l\u00ednea] sock_read_iter+0x2d8/0x40c net/socket.c:1125 new_sync_read fs/read_write.c:484 [en l\u00ednea] vfs_read+0x740/0x970 fs/read_write.c:565 ksys_read+0x15c/0x26c fs/read_write.c:708\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/ipmr_base.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/ipmr_base.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.291\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.235\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.179\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.129\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.76\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.13\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.2\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.291\",\"matchCriteriaId\":\"0621B0C8-6B2C-4585-A573-E22908F29576\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.235\",\"matchCriteriaId\":\"545121FA-DE31-4154-9446-C2000FB4104D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.179\",\"matchCriteriaId\":\"C708062C-4E1B-465F-AE6D-C09C46400875\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.129\",\"matchCriteriaId\":\"2DA5009C-C9B9-4A1D-9B96-78427E8F232C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.76\",\"matchCriteriaId\":\"A6D70701-9CB6-4222-A957-00A419878993\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.13\",\"matchCriteriaId\":\"2897389C-A8C3-4D69-90F2-E701B3D66373\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.2\",\"matchCriteriaId\":\"6D4116B1-1BFD-4F23-BA84-169CC05FC5A3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfde\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:13:48+00:00",
      "cve": "CVE-2025-21719",
      "id": "CVE-2025-21719",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipmr: do not call mr_mfc_uses_dev() for unres entries",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21719.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T01:28:27Z",
      "cve": "CVE-2025-21719",
      "id": "CVE-2025-21719",
      "initial_release_date": "2025-02-28T02:21:59Z",
      "product_status:known_affected": "524",
      "product_status:known_not_affected": "298",
      "product_status:recommended": "358",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21719",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21719.json",
      "version": "53"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.