CVE-2024-26736

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AFS VL traffic is unauthenticated rxrpc over UDP, so a rogue cell server or an on-path response spoofer reaches this code across the network.\nAC:H - Overflowing `idbuf[16]` requires `volume->vid` to exceed 10 decimal digits, but the on-wire `volumeId[]` field is `__be32` (fs/afs/afs_vl.h:123) and is the sole source of `volume->vid`, capping it at `4294967295`. The wire-format width is a hard constraint entirely beyond the attacker's control, so no attainable input triggers the write.\nPR:N - The attacker is the VL server (or a network entity spoofing its unauthenticated replies) and holds no account, credential, or capability on the target host. No local privilege on the victim is consumed anywhere along the `afs_select_fileserver` \u2192 `afs_check_volume_status` \u2192 `afs_update_volume_status` path.\nUI:N - On a configured AFS client `/afs` is already mounted at boot, and the volume-status refresh fires from routine background revalidation and from server-supplied VMOVED/VNOVOL responses without any victim action. The attacker drives the update himself via the fileserver's abort codes.\nS:U - Any corruption is confined to the AFS client's own kernel stack frame within the same kernel security authority. No VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - A stack write past `idbuf` overwrites the adjacent locals in the same frame \u2014 the `new`/`old`/`discard`/`vldb` pointers and `idsz` \u2014 and corrupting `vldb` or `idsz` redirects the subsequent `memcmp`/`memcpy` of the volume name and the `afs_alloc_server_list()` walk, yielding an attacker-influenced kernel read. Per kernel guidance, memory corruption leverageable for disclosure is scored High.\nI:H - This is an out-of-bounds stack write, which per kernel guidance is High: the clobbered pointers are dereferenced and written through immediately afterwards (`memcpy(volume->name, vldb->name, AFS_MAXVOLNAME)`, `rcu_assign_pointer(volume->servers, new)`), giving a path to controlled kernel memory modification and control-flow influence.\nA:H - On any stack-protector kernel the 5-byte overrun smashes the canary and `__stack_chk_fail()` panics the machine; without it, the corrupted `vldb`/`new`/`old` pointers are dereferenced and freed (`kfree(vldb)`, `afs_put_serverlist()`), producing an oops. Either outcome is a full kernel crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/volume.c"], "versions": [{"version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5", "status": "affected", "versionType": "git"}, {"version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "d9b5e2b7a8196850383c70d099bfd39e81ab6637", "status": "affected", "versionType": "git"}, {"version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e56662160fc24d28cb75ac095cc6415ae1bda43e", "status": "affected", "versionType": "git"}, {"version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e8530b170e464017203e3b8c6c49af6e916aece1", "status": "affected", "versionType": "git"}, {"version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "6e6065dd25b661420fac19c34282b6c626fcd35e", 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AFS VL traffic is unauthenticated rxrpc over UDP, so a rogue cell server or an on-path response spoofer reaches this code across the network.\nAC:H - Overflowing `idbuf[16]` requires `volume->vid` to exceed 10 decimal digits, but the on-wire `volumeId[]` field is `__be32` (fs/afs/afs_vl.h:123) and is the sole source of `volume->vid`, capping it at `4294967295`. The wire-format width is a hard constraint entirely beyond the attacker's control, so no attainable input triggers the write.\nPR:N - The attacker is the VL server (or a network entity spoofing its unauthenticated replies) and holds no account, credential, or capability on the target host. No local privilege on the victim is consumed anywhere along the `afs_select_fileserver` \u2192 `afs_check_volume_status` \u2192 `afs_update_volume_status` path.\nUI:N - On a configured AFS client `/afs` is already mounted at boot, and the volume-status refresh fires from routine background revalidation and from server-supplied VMOVED/VNOVOL responses without any victim action. The attacker drives the update himself via the fileserver's abort codes.\nS:U - Any corruption is confined to the AFS client's own kernel stack frame within the same kernel security authority. No VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - A stack write past `idbuf` overwrites the adjacent locals in the same frame \u2014 the `new`/`old`/`discard`/`vldb` pointers and `idsz` \u2014 and corrupting `vldb` or `idsz` redirects the subsequent `memcmp`/`memcpy` of the volume name and the `afs_alloc_server_list()` walk, yielding an attacker-influenced kernel read. Per kernel guidance, memory corruption leverageable for disclosure is scored High.\nI:H - This is an out-of-bounds stack write, which per kernel guidance is High: the clobbered pointers are dereferenced and written through immediately afterwards (`memcpy(volume->name, vldb->name, AFS_MAXVOLNAME)`, `rcu_assign_pointer(volume->servers, new)`), giving a path to controlled kernel memory modification and control-flow influence.\nA:H - On any stack-protector kernel the 5-byte overrun smashes the canary and `__stack_chk_fail()` panics the machine; without it, the corrupted `vldb`/`new`/`old` pointers are dereferenced and freed (`kfree(vldb)`, `afs_put_serverlist()`), producing an oops. Either outcome is a full kernel crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5", "versionType": "git"}, {"status": "affected", "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "d9b5e2b7a8196850383c70d099bfd39e81ab6637", "versionType": "git"}, {"status": "affected", "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e56662160fc24d28cb75ac095cc6415ae1bda43e", "versionType": "git"}, {"status": "affected", "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e8530b170e464017203e3b8c6c49af6e916aece1", "versionType": "git"}, {"status": "affected", "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "6e6065dd25b661420fac19c34282b6c626fcd35e", "versionType": "git"}, {"status": "affected", 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idbuf[] size up to 24 to avoid overflow.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\n\n[DH: Actually, it's 20 + NUL, so increase it to 24 and use snprintf()]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: aumenta el tama\u00f1o del b\u00fafer en afs_update_volume_status() La longitud m\u00e1xima del volumen->valor vid es de 20 caracteres. Por lo tanto, aumente el tama\u00f1o de idbuf[] hasta 24 para evitar el desbordamiento. Encontrado por el Centro de verificaci\u00f3n de Linux (linuxtesting.org) con SVACE. [DH: En realidad, es 20 + NUL, as\u00ed que aum\u00e9ntalo a 24 y usa snprintf()]"}], "id": "CVE-2024-26736", "lastModified": "2026-08-04T11:16:59.720", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "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-2024-26736", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-05T17:35:04.677455Z", "version": "2.0.3"}}]}, "published": "2024-04-03T17:15:51.197", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e6065dd25b661420fac19c34282b6c626fcd35e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d34a5e57632bb5ff825196ddd9a48ca403626dfa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9b5e2b7a8196850383c70d099bfd39e81ab6637"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e56662160fc24d28cb75ac095cc6415ae1bda43e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8530b170e464017203e3b8c6c49af6e916aece1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e6065dd25b661420fac19c34282b6c626fcd35e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d34a5e57632bb5ff825196ddd9a48ca403626dfa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9b5e2b7a8196850383c70d099bfd39e81ab6637"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e56662160fc24d28cb75ac095cc6415ae1bda43e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8530b170e464017203e3b8c6c49af6e916aece1"}, {"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-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: afs: Increase buffer size in afs_update_volume_status()", "id": "2273276", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273276"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-121", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nafs: Increase buffer size in afs_update_volume_status()\nThe max length of volume->vid value is 20 characters.\nSo increase idbuf[] size up to 24 to avoid overflow.\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\n[DH: Actually, it's 20 + NUL, so increase it to 24 and use snprintf()]", "A vulnerability was found in the afs_update_volume_status() function in the Linux kernel. This issue could lead to a buffer overflow due to an improperly sized char array that is not large enough to match the corresponding value being placed in it, leading to memory corruption or crashes."], "name": "CVE-2024-26736", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not 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-2024-26736\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26736\nhttps://lore.kernel.org/linux-cve-announce/2024040359-CVE-2024-26736-284d@gregkh/T"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this vulnerability.", "threat_severity": "Moderate"}

{}