CVE-2026-43494 (GCVE-0-2026-43494)
Vulnerability from cvelistv5
Published
2026-05-21 10:49
Modified
2026-10-19 19:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
Version: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/05/21/2\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-05-21T15:04:20.704Z\"}}, {\"title\": \"kernel: net/rds: reset op_nents when zerocopy page pin fails\", \"metrics\": [{\"other\": {\"type\": \"Red Hat severity rating\", \"content\": {\"value\": \"Important\", \"namespace\": \"https://access.redhat.com/security/updates/classification/\"}}}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"cpes\": [\"cpe:/o:redhat:enterprise_linux:10\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 10\", \"packageName\": \"kernel\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:6\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"kernel\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"kernel\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"kernel-rt\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"kernel\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"kernel-rt\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9\", \"packageName\": \"kernel\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9\", \"packageName\": \"kernel-rt\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-21T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-05-21T00:00:00.000Z\", \"value\": \"Made public.\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-05-21T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-43494\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2480434\", \"name\": \"RHBZ#2480434\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43494.json\", \"tags\": [\"x_sadp-csaf-vex\"]}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the Linux kernel, specifically within the `net/rds` module. 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Triggered entirely by a local `sendmsg(MSG_ZEROCOPY)` syscall operating on the sending process\u0027s own user memory; a remote peer has no control over the page-pinning that fails, so it is not network-reachable.\\nAC:L - The attacker fully controls the iovec layout and can deterministically pin one valid segment then point a later segment at unmapped memory to force `iov_iter_get_pages2()` to fail with `op_nents\u003e=1`; no race or uncontrolled condition.\\nPR:L - `rds_create()` performs no capability check, so any unprivileged local user can open the AF_RDS socket and reach the zerocopy send path; no real root or CAP needed.\\nUI:N - The attacker performs the entire socket/setsockopt/sendmsg sequence themselves; no victim action is required.\\nS:U - The corruption is within the kernel\u0027s own page-management security authority; there is no VM, IOMMU, or sandbox boundary crossed.\\nC:H - The refcount underflow frees a page still mapped in the attacker\u0027s address space; once reused for other kernel/process data it remains readable through the stale mapping, enabling arbitrary memory disclosure.\\nI:H - The same stale-mapping primitive permits writing into reallocated pages (page tables, slab, other tasks\u0027 memory), yielding an arbitrary-write/control-flow-hijack primitive suitable for privilege escalation.\\nA:H - The double-free / page reference-count underflow corrupts kernel page state and reliably causes oops/panic, a full availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"c6e51512a784c4a7b86e1a044988696e3b3721fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"03014551938a0887fa55f18ce49b70158a9c0113\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"d84ce1786ce40fdd3dd98db47aec5527817e1ef6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"9115669faedccdda100428e2d26fd0aac8c50799\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"0bbbff00a15b1df2cac9014d6cf4b6890f473353\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"640e37f58f991546a87540d067279c2c1fa9fe51\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"290e833d1acb1093bc121fcdc97f5e6161157479\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\", \"lessThan\": \"e174929793195e0cd6a4adb0cad731b39f9019b4\", \"versionType\": \"git\"}], \"programFiles\": [\"net/rds/message.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.141\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.91\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/rds/message.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa\"}, {\"url\": \"https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113\"}, {\"url\": \"https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6\"}, {\"url\": \"https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799\"}, {\"url\": \"https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353\"}, {\"url\": \"https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51\"}, {\"url\": \"https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479\"}, {\"url\": \"https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4\"}, {\"url\": \"https://github.com/v12-security/pocs/tree/main/pintheft\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/rds: reset op_nents when zerocopy page pin fails\\n\\nWhen iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),\\nthe pinned pages are released with put_page(), and\\nrm-\u003edata.op_mmp_znotifier is cleared.  But we fail to properly\\nclear rm-\u003edata.op_nents.\\n\\nLater when rds_message_purge() is called from rds_sendmsg() the\\ncleanup loop iterates over the incorrectly non zero number of\\nop_nents and frees them again.\\n\\nFix this by properly resetting op_nents when it should be in\\nrds_message_zcopy_from_user().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.141\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.91\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.33\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.10\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"4.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:28:17.738Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43494\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:26:37.859Z\", \"dateReserved\": \"2026-05-01T14:12:56.013Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-21T10:49:21.310Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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