CVE-2024-41049

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However, before the tracepoint could\nfire, another task raced in and freed that lock.\n\nFix this by moving the tracepoint inside the spinlock, which should\nensure that this doesn't happen."}], "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 - The vulnerable `posix_lock_inode()` is reached from the local `fcntl(F_SETLK/F_SETLKW/F_OFD_SETLK)` syscall path (`fcntl_setlk` \u2192 `do_lock_file_wait` \u2192 `vfs_lock_file` \u2192 `posix_lock_file`), which is the universally present attack surface on every system. The nfsd/lockd/ksmbd callers of `vfs_lock_file()` also reach it, but those require an optional network file server to be configured and exporting a filesystem with no private `->lock`, so the core defect is characterized as local.\nAC:L - The attacker controls both sides of the race: one thread issues an overlapping same-type `F_SETLK` that merges into an existing lock (making `request` point at a list-resident lock), while a second attacker thread issues an overlapping `F_UNLCK`/`close()` that deletes and `kmem_cache_free()`s that entry, and the window between `spin_unlock(&ctx->flc_lock)`/`percpu_up_read()` and the tracepoint can be hit repeatedly in a tight loop with threads pinned to separate CPUs. Consistent with this CNA's scoring of other tracepoint-gated use-after-frees (CVE-2026-63910, CVE-2024-56759), the tracepoint-enabled precondition does not raise complexity.\nPR:L - Any unprivileged local user can call `fcntl()` on a file descriptor for a file it can already open; the only gate on the path is the `security_file_lock()` LSM hook, with no capability, root, or namespace requirement. POSIX advisory locks work on ordinary files in `/tmp`, `/dev/shm`, or the user's home directory.\nUI:N - The attacker's own threads perform every step \u2014 allocating the lock, merging it, and freeing it concurrently \u2014 with no action required from any other user or administrator.\nS:U - The freed `struct file_lock`, the corrupted read, and any resulting panic are all confined to the kernel of the same system; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - The tracepoint reads seven fields out of a freed `filelock_cache` object \u2014 including the raw `flc_blocker` and `flc_owner` kernel pointers and the 64-bit `fl_start`/`fl_end` \u2014 after the attacker has had the opportunity to groom and reallocate that slab object, disclosing arbitrary reallocated kernel memory contents and defeating KASLR. Per kernel scoring guidance, use-after-free is rated High.\nI:H - A use-after-free on a `struct file_lock` that the attacker can reliably reallocate under control gives the classic UAF primitive \u2014 the stale `request` pointer is consumed as a live object after `kmem_cache_free()`, and heap spraying against the freed slot makes the condition exploitable for memory corruption rather than a benign stale read. Consistent with kernel guidance and this CNA's rating of the equivalent `dma_buf_fd()` tracepoint UAF, integrity impact is High.\nA:H - This is precisely the reported failure mode: the UAF read faulted the kernel on the reporter's MTE-enabled ARM64 system (`do_tag_check_fault` \u2192 `__do_kernel_fault` \u2192 panic), and on KASAN, hardware-tag, `slub_debug`, or `DEBUG_PAGEALLOC` builds the dereference of freed slab memory oopses. The race can be re-triggered in a loop, giving a repeatable local denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/locks.c"], "versions": [{"version": "117fb80cd1e63c419c7a221ce070becb4bfc7b6d", "lessThan": "1cbbb3d9475c403ebedc327490c7c2b991398197", "status": "affected", "versionType": "git"}, {"version": "a6f4129378ca15f62cbdde09a7d3ccc35adcf49d", "lessThan": "7d4c14f4b511fd4c0dc788084ae59b4656ace58b", "status": "affected", "versionType": "git"}, {"version": "766e56faddbec2eaf70c9299e1c9ef74d846d32b", "lessThan": "02a8964260756c70b20393ad4006948510ac9967", "status": "affected", "versionType": "git"}, {"version": "34bff6d850019e00001129d6de3aa4874c2cf471", "lessThan": "5cb36e35bc10ea334810937990c2b9023dacb1b0", "status": "affected", "versionType": "git"}, {"version": "74f6f5912693ce454384eaeec48705646a21c74f", "lessThan": 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The nfsd/lockd/ksmbd callers of `vfs_lock_file()` also reach it, but those require an optional network file server to be configured and exporting a filesystem with no private `->lock`, so the core defect is characterized as local.\nAC:L - The attacker controls both sides of the race: one thread issues an overlapping same-type `F_SETLK` that merges into an existing lock (making `request` point at a list-resident lock), while a second attacker thread issues an overlapping `F_UNLCK`/`close()` that deletes and `kmem_cache_free()`s that entry, and the window between `spin_unlock(&ctx->flc_lock)`/`percpu_up_read()` and the tracepoint can be hit repeatedly in a tight loop with threads pinned to separate CPUs. Consistent with this CNA's scoring of other tracepoint-gated use-after-frees (CVE-2026-63910, CVE-2024-56759), the tracepoint-enabled precondition does not raise complexity.\nPR:L - Any unprivileged local user can call `fcntl()` on a file descriptor for a file it can already open; the only gate on the path is the `security_file_lock()` LSM hook, with no capability, root, or namespace requirement. POSIX advisory locks work on ordinary files in `/tmp`, `/dev/shm`, or the user's home directory.\nUI:N - The attacker's own threads perform every step \u2014 allocating the lock, merging it, and freeing it concurrently \u2014 with no action required from any other user or administrator.\nS:U - The freed `struct file_lock`, the corrupted read, and any resulting panic are all confined to the kernel of the same system; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - The tracepoint reads seven fields out of a freed `filelock_cache` object \u2014 including the raw `flc_blocker` and `flc_owner` kernel pointers and the 64-bit `fl_start`/`fl_end` \u2014 after the attacker has had the opportunity to groom and reallocate that slab object, disclosing arbitrary reallocated kernel memory contents and defeating KASLR. Per kernel scoring guidance, use-after-free is rated High.\nI:H - A use-after-free on a `struct file_lock` that the attacker can reliably reallocate under control gives the classic UAF primitive \u2014 the stale `request` pointer is consumed as a live object after `kmem_cache_free()`, and heap spraying against the freed slot makes the condition exploitable for memory corruption rather than a benign stale read. Consistent with kernel guidance and this CNA's rating of the equivalent `dma_buf_fd()` tracepoint UAF, integrity impact is High.\nA:H - This is precisely the reported failure mode: the UAF read faulted the kernel on the reporter's MTE-enabled ARM64 system (`do_tag_check_fault` \u2192 `__do_kernel_fault` \u2192 panic), and on KASAN, hardware-tag, `slub_debug`, or `DEBUG_PAGEALLOC` builds the dereference of freed slab memory oopses. The race can be re-triggered in a loop, giving a repeatable local denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "117fb80cd1e63c419c7a221ce070becb4bfc7b6d", "lessThan": "1cbbb3d9475c403ebedc327490c7c2b991398197", "versionType": "git"}, {"status": "affected", "version": "a6f4129378ca15f62cbdde09a7d3ccc35adcf49d", "lessThan": "7d4c14f4b511fd4c0dc788084ae59b4656ace58b", "versionType": "git"}, {"status": "affected", "version": "766e56faddbec2eaf70c9299e1c9ef74d846d32b", "lessThan": "02a8964260756c70b20393ad4006948510ac9967", "versionType": "git"}, {"status": "affected", "version": "34bff6d850019e00001129d6de3aa4874c2cf471", "lessThan": "5cb36e35bc10ea334810937990c2b9023dacb1b0", "versionType": "git"}, {"status": "affected", "version": "74f6f5912693ce454384eaeec48705646a21c74f", "lessThan": "432b06b69d1d354a171f7499141116536579eb6a", "versionType": "git"}, {"status": "affected", "version": "74f6f5912693ce454384eaeec48705646a21c74f", "lessThan": "116599f6a26906cf33f67975c59f0692ecf7e9b2", "versionType": "git"}, {"status": "affected", "version": "74f6f5912693ce454384eaeec48705646a21c74f", "lessThan": "1b3ec4f7c03d4b07bad70697d7e2f4088d2cfe92", "versionType": "git"}, {"status": "affected", "version": "e75396988bb9b3b90e6e8690604d0f566cea403a", "versionType": "git"}, {"status": "affected", "version": "5.4.257", "lessThan": "5.4.280", "versionType": "semver"}, {"status": "affected", "version": "5.10.197", "lessThan": "5.10.222", "versionType": "semver"}, {"status": "affected", "version": "5.15.133", "lessThan": "5.15.163", "versionType": "semver"}, {"status": "affected", "version": "6.1.55", "lessThan": "6.1.100", "versionType": "semver"}, {"status": "affected", "version": "6.5.5", "lessThan": "6.6", "versionType": "semver"}], "programFiles": ["fs/locks.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"status": "unaffected", "version": "0", "lessThan": "6.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.280", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.222", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.163", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.100", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.41", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.9.10", "versionType": "semver", "lessThanOrEqual": "6.9.*"}, {"status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/locks.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1cbbb3d9475c403ebedc327490c7c2b991398197"}, {"url": "https://git.kernel.org/stable/c/7d4c14f4b511fd4c0dc788084ae59b4656ace58b"}, {"url": "https://git.kernel.org/stable/c/02a8964260756c70b20393ad4006948510ac9967"}, {"url": "https://git.kernel.org/stable/c/5cb36e35bc10ea334810937990c2b9023dacb1b0"}, {"url": "https://git.kernel.org/stable/c/432b06b69d1d354a171f7499141116536579eb6a"}, {"url": "https://git.kernel.org/stable/c/116599f6a26906cf33f67975c59f0692ecf7e9b2"}, {"url": "https://git.kernel.org/stable/c/1b3ec4f7c03d4b07bad70697d7e2f4088d2cfe92"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilelock: fix potential use-after-free in posix_lock_inode\n\nLight Hsieh reported a KASAN UAF warning in trace_posix_lock_inode().\nThe request pointer had been changed earlier to point to a lock entry\nthat was added to the inode's list. 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{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:8613", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.90.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-10-30T00:00:00Z"}, {"advisory": "RHSA-2024:8614", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.90.1.rt14.375.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-10-30T00:00:00Z"}, {"advisory": "RHSA-2024:10942", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.48.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2024-12-11T00:00:00Z"}], "bugzilla": {"description": "kernel: filelock: fix potential use-after-free in posix_lock_inode", "id": "2300422", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300422"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfilelock: fix potential use-after-free in posix_lock_inode\nLight Hsieh reported a KASAN UAF warning in trace_posix_lock_inode().\nThe request pointer had been changed earlier to point to a lock entry\nthat was added to the inode's list. However, before the tracepoint could\nfire, another task raced in and freed that lock.\nFix this by moving the tracepoint inside the spinlock, which should\nensure that this doesn't happen.", "A use-after-free vulnerability was found in the Linux kernel in trace_posix_lock_inode(). This issue occurred when the request pointer was changed to point to a lock entry added to the inode's list. Before the tracepoint could fire, another task raced in and freed the lock."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-41049", "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": "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": "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-41049\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-41049\nhttps://lore.kernel.org/linux-cve-announce/2024072927-CVE-2024-41049-bf28@gregkh/T"], "statement": "Because this vulnerability requires a degree of control over the target system sufficient to control system timings and trigger crafted race conditions, Red Hat assesses its security impact as Moderate.\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-416: Use After Free vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\nAccess to the platform is granted only after successful hard token-based multi-factor authentication (MFA) and is governed by least privilege to ensure that only authorized users and roles can execute or modify code. Red Hat also enforces least functionality, enabling only essential features, services, and ports. Hardening guidelines ensure the most restrictive settings required for operations, while baseline configurations enforce safe memory allocation and deallocation practices to reduce the risk of use-after-free vulnerabilities. The environment employs IPS/IDS and antimalware solutions to detect and prevent malicious code and provide real-time visibility into memory usage, lowering the risk of arbitrary code execution. Static code analysis and peer reviews enforce strong input validation and error handling, reducing the likelihood of denial-of-service (DoS) attacks. In the event of successful exploitation, process isolation prevents a compromised process from accessing memory freed by another, containing potential impact. Finally, memory protection mechanisms such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) enhance resilience against memory-related vulnerabilities.", "threat_severity": "Moderate"}

{}