CVE-2026-63805

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63805", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.013Z", "datePublished": "2026-07-19T12:02:09.669Z", "dateUpdated": "2026-08-17T04:51:11.095Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:11.095Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: nx - fix nx_crypto_ctx_exit argument\n\nnx_crypto_ctx_shash_exit calls nx_crypto_ctx_exit with crypto_shash_ctx(...)\nbut crypto_shash_ctx gives a nx_crypto_ctx *, not a crypto_tfm *.\n\nFix the type in nx_crypto_ctx_exit and drop the bogus crypto_tfm_ctx\ncall.\n\nThis fixes the following oops:\n\n BUG: Unable to handle kernel data access at 0xc0403effffffffc8\n Faulting instruction address: 0xc000000000396cb4\n Oops: Kernel access of bad area, sig: 11 [#15]\n Call Trace:\n nx_crypto_ctx_shash_exit+0x24/0x60\n crypto_shash_exit_tfm+0x28/0x40\n crypto_destroy_tfm+0x98/0x140\n crypto_exit_ahash_using_shash+0x20/0x40\n crypto_destroy_tfm+0x98/0x140\n hash_release+0x1c/0x30\n alg_sock_destruct+0x38/0x60\n __sk_destruct+0x48/0x2b0\n af_alg_release+0x58/0xb0\n __sock_release+0x68/0x150\n sock_close+0x20/0x40\n __fput+0x110/0x3a0\n sys_close+0x48/0xa0\n system_call_exception+0x140/0x2d0\n system_call_common+0xf4/0x258\n\n.. which came from hardlink(1) opportunistically using AF_ALG.\n\nThe same problem exists with nx_crypto_ctx_skcipher_exit getting a context\nit wasn't expecting, but apparently nobody hit that for years."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires a local syscall path (socket/AF_ALG bind, then close via sys_close) through the crypto userspace API; the NX driver is not reachable from remote network packet handling.\nAC:L - On affected IBM Power pSeries systems with NX hardware and the nx-crypto driver loaded, an attacker can deterministically trigger the bug by opening an AF_ALG hash socket, binding a SHA algorithm that selects the nx driver, and closing the socket.\nPR:L - No special privileges are required beyond a normal local user account; AF_ALG sockets are available to unprivileged users and remain reachable from user namespaces without init-namespace root.\nUI:N - No victim interaction is needed beyond the attacker running their own program that opens and closes an AF_ALG crypto socket (as demonstrated by hardlink(1) opportunistically using AF_ALG).\nS:U - Impact is confined to kernel memory within the same security authority; this is a local kernel memory-corruption/crash issue, not a VM escape or cross-security-boundary bypass.\nC:H - The type confusion causes reads through a miscomputed context pointer before the fault, and erroneous kfree_sensitive() on attacker-influenced kernel pointers can corrupt heap metadata and enable further information disclosure.\nI:H - The same type confusion leads to kfree_sensitive() on a wrong address and NULL pointer writes through a misaligned nx_crypto_ctx, giving exploitable heap corruption and arbitrary kernel write primitives.\nA:H - The bug reliably causes a kernel oops (SIGSEGV in kernel mode) during crypto context teardown, crashing the calling context and potentially the entire system under panic-on-oops policy."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/nx/nx.c", "drivers/crypto/nx/nx.h"], "versions": [{"version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "lessThan": "8d8507a457667f23477a15496b91908a5b5b7cf3", "status": "affected", "versionType": "git"}, {"version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "lessThan": "833033e6e55acf11304ff7bbbdf18351d139c281", "status": "affected", "versionType": "git"}, {"version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "lessThan": "4e67f504ee9ded15e256b64f4fde150e917381d7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/nx/nx.c", "drivers/crypto/nx/nx.h"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.5", "versionEndExcluding": "6.18.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "7.1.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8d8507a457667f23477a15496b91908a5b5b7cf3"}, {"url": "https://git.kernel.org/stable/c/833033e6e55acf11304ff7bbbdf18351d139c281"}, {"url": "https://git.kernel.org/stable/c/4e67f504ee9ded15e256b64f4fde150e917381d7"}], "title": "crypto: nx - fix nx_crypto_ctx_exit argument", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/crypto/nx/nx.c", "drivers/crypto/nx/nx.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8d8507a457667f23477a15496b91908a5b5b7cf3", "status": "affected", "version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "versionType": "git"}, {"lessThan": "833033e6e55acf11304ff7bbbdf18351d139c281", "status": "affected", "version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "versionType": "git"}, {"lessThan": "4e67f504ee9ded15e256b64f4fde150e917381d7", "status": "affected", "version": "bfd9efddf990d152dc9912fdca520c5e1e19e1e2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/crypto/nx/nx.c", "drivers/crypto/nx/nx.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.38", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8DAD3EB4-1943-4EC2-9D46-C93C12C5F441", "versionEndExcluding": "6.18.38", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E", "versionEndExcluding": "7.1.3", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: nx - fix nx_crypto_ctx_exit argument\n\nnx_crypto_ctx_shash_exit calls nx_crypto_ctx_exit with crypto_shash_ctx(...)\nbut crypto_shash_ctx gives a nx_crypto_ctx *, not a crypto_tfm *.\n\nFix the type in nx_crypto_ctx_exit and drop the bogus crypto_tfm_ctx\ncall.\n\nThis fixes the following oops:\n\n BUG: Unable to handle kernel data access at 0xc0403effffffffc8\n Faulting instruction address: 0xc000000000396cb4\n Oops: Kernel access of bad area, sig: 11 [#15]\n Call Trace:\n nx_crypto_ctx_shash_exit+0x24/0x60\n crypto_shash_exit_tfm+0x28/0x40\n crypto_destroy_tfm+0x98/0x140\n crypto_exit_ahash_using_shash+0x20/0x40\n crypto_destroy_tfm+0x98/0x140\n hash_release+0x1c/0x30\n alg_sock_destruct+0x38/0x60\n __sk_destruct+0x48/0x2b0\n af_alg_release+0x58/0xb0\n __sock_release+0x68/0x150\n sock_close+0x20/0x40\n __fput+0x110/0x3a0\n sys_close+0x48/0xa0\n system_call_exception+0x140/0x2d0\n system_call_common+0xf4/0x258\n\n.. which came from hardlink(1) opportunistically using AF_ALG.\n\nThe same problem exists with nx_crypto_ctx_skcipher_exit getting a context\nit wasn't expecting, but apparently nobody hit that for years."}], "id": "CVE-2026-63805", "lastModified": "2026-08-17T05:17:17.243", "metrics": {"cvssMetricV31": [{"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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T12:16:53.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e67f504ee9ded15e256b64f4fde150e917381d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/833033e6e55acf11304ff7bbbdf18351d139c281"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d8507a457667f23477a15496b91908a5b5b7cf3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: nx - fix nx_crypto_ctx_exit argument", "id": "2502246", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502246"}, "csaw": false, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncrypto: nx - fix nx_crypto_ctx_exit argument\nnx_crypto_ctx_shash_exit calls nx_crypto_ctx_exit with crypto_shash_ctx(...)\nbut crypto_shash_ctx gives a nx_crypto_ctx *, not a crypto_tfm *.\nFix the type in nx_crypto_ctx_exit and drop the bogus crypto_tfm_ctx\ncall.\nThis fixes the following oops:\nBUG: Unable to handle kernel data access at 0xc0403effffffffc8\nFaulting instruction address: 0xc000000000396cb4\nOops: Kernel access of bad area, sig: 11 [#15]\nCall Trace:\nnx_crypto_ctx_shash_exit+0x24/0x60\ncrypto_shash_exit_tfm+0x28/0x40\ncrypto_destroy_tfm+0x98/0x140\ncrypto_exit_ahash_using_shash+0x20/0x40\ncrypto_destroy_tfm+0x98/0x140\nhash_release+0x1c/0x30\nalg_sock_destruct+0x38/0x60\n__sk_destruct+0x48/0x2b0\naf_alg_release+0x58/0xb0\n__sock_release+0x68/0x150\nsock_close+0x20/0x40\n__fput+0x110/0x3a0\nsys_close+0x48/0xa0\nsystem_call_exception+0x140/0x2d0\nsystem_call_common+0xf4/0x258\n.. which came from hardlink(1) opportunistically using AF_ALG.\nThe same problem exists with nx_crypto_ctx_skcipher_exit getting a context\nit wasn't expecting, but apparently nobody hit that for years.", "A flaw was found in the Linux kernel's cryptographic module. An issue with how the nx_crypto_ctx_exit function handles arguments can cause the kernel to crash. This vulnerability could be exploited by a local user, leading to a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-63805", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63805\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63805\nhttps://lore.kernel.org/linux-cve-announce/2026071902-CVE-2026-63805-118e@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd9efddf990d152dc9912fdca520c5e1e19e1e2,8d8507a457667f23477a15496b91908a5b5b7cf3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd9efddf990d152dc9912fdca520c5e1e19e1e2,833033e6e55acf11304ff7bbbdf18351d139c281)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd9efddf990d152dc9912fdca520c5e1e19e1e2,4e67f504ee9ded15e256b64f4fde150e917381d7)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.38,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.3,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T01:30:17.675668+00:00", "updated": "2026-08-12T11:00:02.920313+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}