CVE-2026-43078 (GCVE-0-2026-43078)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-08-05 12:25
VLAI
Title
crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl When page reassignment was added to af_alg_pull_tsgl the original loop wasn't updated so it may try to reassign one more page than necessary. Add the check to the reassignment so that this does not happen. Also update the comment which still refers to the obsolete offset argument.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < fa48d3ea9cdbfb28c1fd6756c6c5cd01351aa51e (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 2b781d1d4f933990318bcc5c68fb75a717379e42 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < f7826bc0b39928a4a22f6b815dd9940b22a63503 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 710a4ce5d7afd9fe082c75dec282ab4a11c0fe71 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < c8369a6d62f5abde9cbd4b62c45bf4b996be2468 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < dea5fcf085f977b6c2de1b2d4ec4767b6c840d1f (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 9532501e0f1b200ea80baa0e33e0b06da10bb271 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 31d00156e50ecad37f2cb6cbf04aaa9a260505ef (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.254 , ≤ 5.10.* (semver)
Unaffected: 5.15.204 , ≤ 5.15.* (semver)
Unaffected: 6.1.170 , ≤ 6.1.* (semver)
Unaffected: 6.6.137 , ≤ 6.6.* (semver)
Unaffected: 6.12.85 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The vulnerable AF_ALG skcipher/AEAD path is reached through local socket syscalls such as socket, bind, accept, sendmsg/sendmmsg, and recvmsg. It is not reachable directly from remote network input.\nAC:L - An attacker controls the AF_ALG socket state, TX scatterlist layout, and recv length needed to end processing on an SG boundary and trigger the zero-length reassignment. No race or external timing condition is required.\nPR:L - Creating and using PF_ALG sockets for userspace crypto does not require real root or administrative capabilities. A basic unprivileged local user can reach the affected code.\nUI:N - Exploitation only requires attacker-issued syscalls on the attacker\u0027s own AF_ALG socket. No victim action is needed.\nS:U - The corruption occurs inside the kernel and impacts the same kernel security authority. This is standard local kernel attack surface rather than a VM or hardware boundary escape.\nC:H - The bug is kernel heap memory corruption immediately past an allocated scatterlist object. Following the higher-severity rule, this can plausibly be leveraged for kernel memory disclosure.\nI:H - The pre-fix code writes a scatterlist entry past the allocated destination array via sg_set_page. This is an out-of-bounds kernel heap write and can plausibly support privilege escalation or control-flow/object corruption.\nA:H - The issue is directly observed as a KASAN slab-out-of-bounds crash in af_alg_pull_tsgl from recvmsg. Repeated triggering can crash or destabilize the kernel."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43078\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:20.853\",\"lastModified\":\"2026-06-17T10:48:53.647\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl\\n\\nWhen page reassignment was added to af_alg_pull_tsgl the original\\nloop wasn\u0027t updated so it may try to reassign one more page than\\nnecessary.\\n\\nAdd the check to the reassignment so that this does not happen.\\n\\nAlso update the comment which still refers to the obsolete offset\\nargument.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"crypto/af_alg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"fa48d3ea9cdbfb28c1fd6756c6c5cd01351aa51e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"2b781d1d4f933990318bcc5c68fb75a717379e42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"f7826bc0b39928a4a22f6b815dd9940b22a63503\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"710a4ce5d7afd9fe082c75dec282ab4a11c0fe71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"c8369a6d62f5abde9cbd4b62c45bf4b996be2468\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"dea5fcf085f977b6c2de1b2d4ec4767b6c840d1f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"9532501e0f1b200ea80baa0e33e0b06da10bb271\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"31d00156e50ecad37f2cb6cbf04aaa9a260505ef\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"crypto/af_alg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.254\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.204\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.170\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.137\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.85\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.1\",\"versionEndExcluding\":\"5.10.254\",\"matchCriteriaId\":\"E49F4532-8422-46F7-B2E8-96E820919D16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.204\",\"matchCriteriaId\":\"FA800016-0012-4E3F-A528-2A7F378A0A4A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.170\",\"matchCriteriaId\":\"E6653854-B188-42DD-B8C5-0143F1956AB1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.137\",\"matchCriteriaId\":\"3CA3EF52-168A-4348-8F5F-356C9EB69261\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.85\",\"matchCriteriaId\":\"F17D292D-A9B5-4DC7-8002-51AB95335606\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-22T11:56:14+00:00",
      "cve": "CVE-2026-43078",
      "id": "CVE-2026-43078",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43078.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-07T02:19:05Z",
      "cve": "CVE-2026-43078",
      "id": "CVE-2026-43078",
      "initial_release_date": "2026-05-07T02:19:05Z",
      "product_status:known_affected": "220",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43078",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43078.json",
      "version": "2"
    }
  }
}



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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.