{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46024", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.093Z", "datePublished": "2026-05-27T12:56:29.932Z", "dateUpdated": "2026-08-05T12:29:11.187Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:11.187Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()\n\nIf a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both\nprotocol and result, this is currently not treated as an error. In case\nof ac->negotiating == true and ac->protocol > 0, this leads to setting\nac->protocol = 0 and ac->ops = NULL. Thereafter, the check for\nac->protocol != protocol returns false, and init_protocol() is not\ncalled. Subsequently, ac->ops->handle_reply() is called, which leads to\na null pointer dereference, because ac->ops is still NULL.\n\nThis patch changes the check for ac->protocol != protocol to\n!ac->protocol, as this also includes the case when the protocol was set\nto zero in the message. This causes the message to be treated as\ncontaining a bad auth protocol." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code processes a CEPH_MSG_AUTH_REPLY received from a remote Ceph monitor over TCP; the libceph client reaches monitors across routed networks, so the attacker (rogue monitor or MITM) operates remotely.\nAC:L - The attacker fully controls the reply message contents and sends protocol=0/result=0 during the negotiation it controls; the crash is deterministic with no race or unobservable memory-layout dependency.\nPR:N - The crafted reply is processed during the authentication handshake before the monitor's identity is verified, and a remote server/MITM needs no privileges on the victim client.\nUI:N - Once a CephFS/RBD client is connected, monitor connections and reconnections (and the negotiation state) occur automatically, so no user action is required at attack time.\nS:U - The crash occurs within the kernel itself with no crossing of a security boundary into another authority such as a hypervisor or other VM.\nC:N - A NULL pointer dereference yields no information disclosure; no attacker-controlled memory is read or leaked.\nI:N - The NULL dereference does not modify any kernel data and provides no write primitive.\nA:H - Dereferencing the NULL ac->ops triggers a kernel oops/panic, crashing the system — a remote denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/auth.c" ], "versions": [ { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "9ded62c302c0342efdb5eda3bf6e75720caad0df", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "f101271fcf55d7eacfefd610b51ec65f46ba8118", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "4b2738b93edad661178340239de657d876b73d3d", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "927e4bd5692f2a4901808822981fb2c8d4456548", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "016bc663657366d386993f63eb31072eb45a2b77", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "8f2be7285941a33a9f72579a23b96392f83c758e", "status": "affected", "versionType": "git" }, { "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc", "lessThan": "5199c125d25aeae8615c4fc31652cc0fe624338e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/auth.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df" }, { "url": "https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118" }, { "url": "https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d" }, { "url": "https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548" }, { "url": "https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77" }, { "url": "https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e" }, { "url": "https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e" } ], "title": "libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()", "x_generator": { "engine": "bippy-1.2.0" } } } }