CVE-2024-26689

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It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The freeing half of the race executes in `handle_cap_grant()`/`ceph_fill_inode()` while parsing `CEPH_MSG_CLIENT_CAPS` messages and reply traces received from the remote Ceph MDS, so a co-tenant CephFS client, a malicious/compromised MDS, or a MITM on the (by-default unencrypted) msgr connection controls the timing and content of the free. The freed buffer's contents are additionally marshalled into `msg->middle` and transmitted back over the network to the MDS.\nAC:L - The attacker drives both sides of the race \u2014 local/co-tenant `setxattr` traffic opens the unlocked `__prep_cap()`\u2192`__send_cap()` window, while concurrent access to the same inode from another client forces the MDS to emit the cap grant with a higher `xattr_version` that drops the last reference \u2014 and the sequence can be retried without limit until the window is hit.\nPR:L - Exploitation requires only an ordinary unprivileged account with write access to a file on an already-mounted CephFS (no capabilities are checked anywhere on the `setxattr`\u2192`ceph_check_caps`\u2192`__prep_cap` path), or an equally unprivileged co-tenant account on the same shared CephFS.\nUI:N - No victim action is needed at exploit time; the CephFS mount is pre-existing deployment configuration, and the attacker's own syscalls and MDS traffic supply every step of the race.\nS:U - The corruption is confined to kernel heap objects within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free whose stale `vec.iov_base`/`vec.iov_len` are read back and sent to the MDS as the cap message middle section, leaking reallocated kernel heap contents to a remote peer, and heap grooming of the small `kmalloc-64` `ceph_buffer` object generalizes this into an arbitrary kernel-memory read.\nI:H - `ceph_buffer_get()` performs a `kref_get()` increment directly into freed memory, corrupting a refcount field of whatever object is reallocated into that slab slot, and the later `ceph_buffer_put()`/`kvfree()` on stale pointers yields a double-free/arbitrary-free \u2014 both standard stepping stones to arbitrary write and control-flow hijack.\nA:H - The use-after-free was caught by KASAN and, unmitigated, corrupts slab metadata and refcounts leading to oops, double-free and kernel panic, which the attacker can trigger repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/caps.c"], "versions": [{"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "8180d0c27b93a6eb60da1b08ea079e3926328214", "status": "affected", "versionType": "git"}, {"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "70e329b440762390258a6fe8c0de93c9fdd56c77", "status": "affected", "versionType": "git"}, {"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "f3f98d7d84b31828004545e29fd7262b9f444139", "status": "affected", "versionType": "git"}, {"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "ae20db45e482303a20e56f2db667a9d9c54ac7e7", "status": "affected", "versionType": "git"}, {"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc", "status": "affected", "versionType": "git"}, {"version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "cda4672da1c26835dcbd7aec2bfed954eda9b5ef", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/caps.c"], "versions": [{"version": "2.6.34", "status": "affected"}, {"version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.210", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.149", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.79", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.18", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.6", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8", "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": "5.10.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.149"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.79"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.7.6"}, {"vulnerable": true, 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The freed buffer's contents are additionally marshalled into `msg->middle` and transmitted back over the network to the MDS.\nAC:L - The attacker drives both sides of the race \u2014 local/co-tenant `setxattr` traffic opens the unlocked `__prep_cap()`\u2192`__send_cap()` window, while concurrent access to the same inode from another client forces the MDS to emit the cap grant with a higher `xattr_version` that drops the last reference \u2014 and the sequence can be retried without limit until the window is hit.\nPR:L - Exploitation requires only an ordinary unprivileged account with write access to a file on an already-mounted CephFS (no capabilities are checked anywhere on the `setxattr`\u2192`ceph_check_caps`\u2192`__prep_cap` path), or an equally unprivileged co-tenant account on the same shared CephFS.\nUI:N - No victim action is needed at exploit time; the CephFS mount is pre-existing deployment configuration, and the attacker's own syscalls and MDS traffic supply every step of the race.\nS:U - The corruption is confined to kernel heap objects within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free whose stale `vec.iov_base`/`vec.iov_len` are read back and sent to the MDS as the cap message middle section, leaking reallocated kernel heap contents to a remote peer, and heap grooming of the small `kmalloc-64` `ceph_buffer` object generalizes this into an arbitrary kernel-memory read.\nI:H - `ceph_buffer_get()` performs a `kref_get()` increment directly into freed memory, corrupting a refcount field of whatever object is reallocated into that slab slot, and the later `ceph_buffer_put()`/`kvfree()` on stale pointers yields a double-free/arbitrary-free \u2014 both standard stepping stones to arbitrary write and control-flow hijack.\nA:H - The use-after-free was caught by KASAN and, unmitigated, corrupts slab metadata and refcounts leading to oops, double-free and kernel panic, which the attacker can trigger repeatedly."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "8180d0c27b93a6eb60da1b08ea079e3926328214", "versionType": "git"}, {"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "70e329b440762390258a6fe8c0de93c9fdd56c77", "versionType": "git"}, {"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "f3f98d7d84b31828004545e29fd7262b9f444139", "versionType": "git"}, {"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "ae20db45e482303a20e56f2db667a9d9c54ac7e7", "versionType": "git"}, {"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc", "versionType": "git"}, {"status": "affected", "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f", "lessThan": "cda4672da1c26835dcbd7aec2bfed954eda9b5ef", "versionType": "git"}], "programFiles": ["fs/ceph/caps.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.34"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.34", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.210", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.149", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.79", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.18", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.6", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ceph/caps.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214"}, {"url": "https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77"}, {"url": "https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139"}, {"url": "https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7"}, {"url": "https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc"}, {"url": "https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg->xattr_buf is assigned to ci->i_xattrs.blob. 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This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ceph: evita el use-after-free en encode_cap_msg() En fs/ceph/caps.c, en encode_cap_msg(), KASAN detect\u00f3 el error \"use after free\" en este l\u00ednea - 'ceph_buffer_get(arg->xattr_buf);'. Esto implica que antes de que el recuento pudiera incrementarse aqu\u00ed, fue liberado. En el mismo archivo, en \"handle_cap_grant()\", el refcount se reduce en esta l\u00ednea: 'ceph_buffer_put(ci->i_xattrs.blob);'. Parece que se produjo una ejecuci\u00f3n y la \u00faltima l\u00ednea liber\u00f3 el recurso antes de que la primera l\u00ednea pudiera incrementarlo. __send_cap() llama a encode_cap_msg() y ceph_check_caps() llama a __send_cap() despu\u00e9s de llamar a __prep_cap(). __prep_cap() es donde arg->xattr_buf se asigna a ci->i_xattrs.blob. Este es el punto donde se debe aumentar el recuento para evitar el error \"use after free\"."}], "id": "CVE-2024-26689", "lastModified": "2026-08-04T11:16:56.117", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26689", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-08-15T19:26:55.316031Z", "version": "2.0.3"}}]}, "published": "2024-04-03T15:15:52.427", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ceph: prevent use-after-free in encode_cap_msg()", "id": "2273102", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273102"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nceph: prevent use-after-free in encode_cap_msg()\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This\nimplies before the refcount could be increment here, it was freed.\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error.", "A use-after-free flaw was found in the Linux kernel\u2019s experimental Ceph distributed file system. This flaw allows a local user to crash the system."], "name": "CVE-2024-26689", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26689\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26689\nhttps://lore.kernel.org/linux-cve-announce/2024040336-CVE-2024-26689-990b@gregkh/T"], "threat_severity": "Moderate"}

{}