{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2024-49949 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2024-49949 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2024-49949 and fix it if it is affected.\n\nWhat it is: CVE-2024-49949 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2024-49949 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2024-49949/ (Markdown: https://insights.sbomify.com/CVE-2024-49949/index.md)","id":"CVE-2024-49949","markdown":"https://insights.sbomify.com/CVE-2024-49949/index.md","name":"CVE-2024-49949","record":{"aliases":["AZL-52628","BELL-CVE-2024-49949","DEBIAN-CVE-2024-49949","GHSA-4x74-8q36-fc3h","UBUNTU-CVE-2024-49949"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can cause a kernel crash via a crafted GSO packet, leading to denial of service in the Linux kernel network stack.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: avoid potential underflow in qdisc_pkt_len_init() with UFO\n\nAfter commit 7c6d2ecbda83 (\"net: be more gentle about silly gso\nrequests coming from user\") virtio_net_hdr_to_skb() had sanity check\nto detect malicious attempts from user space to cook a bad GSO packet.\n\nThen commit cf9acc90c80ec (\"net: virtio_net_hdr_to_skb: count\ntransport header in UFO\") while fixing one issue, allowed user space\nto cook a GSO packet with the following characteristic :\n\nIPv4 SKB_GSO_UDP, gso_size=3, skb-\u003elen = 28.\n\nWhen this packet arrives in qdisc_pkt_len_init(), we end up\nwith hdr_len = 28 (IPv4 header + UDP header), matching skb-\u003elen\n\nThen the following sets gso_segs to 0 :\n\ngso_segs = DIV_ROUND_UP(skb-\u003elen - hdr_len,\n                        shinfo-\u003egso_size);\n\nThen later we set qdisc_skb_cb(skb)-\u003epkt_len to back to zero :/\n\nqdisc_skb_cb(skb)-\u003epkt_len += (gso_segs - 1) * hdr_len;\n\nThis leads to the following crash in fq_codel [1]\n\nqdisc_pkt_len_init() is best effort, we only want an estimation\nof the bytes sent on the wire, not crashing the kernel.\n\nThis patch is fixing this particular issue, a following one\nadds more sanity checks for another potential bug.\n\n[1]\n[   70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[   70.724561] #PF: supervisor read access in kernel mode\n[   70.724561] #PF: error_code(0x0000) - not-present page\n[   70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0\n[   70.724561] Oops: Oops: 0000 [#1] SMP NOPTI\n[   70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991\n[   70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel\n[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u003c49\u003e 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49\nAll code\n========\n   0:\t24 08                \tand    $0x8,%al\n   2:\t49 c1 e1 06          \tshl    $0x6,%r9\n   6:\t44 89 7c 24 18       \tmov    %r15d,0x18(%rsp)\n   b:\t45 31 ed             \txor    %r13d,%r13d\n   e:\t45 31 c0             \txor    %r8d,%r8d\n  11:\t31 ff                \txor    %edi,%edi\n  13:\t89 44 24 14          \tmov    %eax,0x14(%rsp)\n  17:\t4c 03 8b 90 01 00 00 \tadd    0x190(%rbx),%r9\n  1e:\teb 04                \tjmp    0x24\n  20:\t39 ca                \tcmp    %ecx,%edx\n  22:\t73 37                \tjae    0x5b\n  24:\t4d 8b 39             \tmov    (%r9),%r15\n  27:\t83 c7 01             \tadd    $0x1,%edi\n  2a:*\t49 8b 17             \tmov    (%r15),%rdx\t\t\u003c-- trapping instruction\n  2d:\t49 89 11             \tmov    %rdx,(%r9)\n  30:\t41 8b 57 28          \tmov    0x28(%r15),%edx\n  34:\t45 8b 5f 34          \tmov    0x34(%r15),%r11d\n  38:\t49 c7 07 00 00 00 00 \tmovq   $0x0,(%r15)\n  3f:\t49                   \trex.WB\n\nCode starting with the faulting instruction\n===========================================\n   0:\t49 8b 17             \tmov    (%r15),%rdx\n   3:\t49 89 11             \tmov    %rdx,(%r9)\n   6:\t41 8b 57 28          \tmov    0x28(%r15),%edx\n   a:\t45 8b 5f 34          \tmov    0x34(%r15),%r11d\n   e:\t49 c7 07 00 00 00 00 \tmovq   $0x0,(%r15)\n  15:\t49                   \trex.WB\n[   70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202\n[   70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000\n[   70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\n[   70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000\n[   70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58\n[   70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000\n[   70.724561] FS:  000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000\n[   70.724561] CS:  0010 DS: 0000 ES: 0000 C\n---truncated---","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net: avoid potential underflow in qdisc_pkt_len_init() with UFO","id":"CVE-2024-49949","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2024"},"n_packages":0,"n_references":9,"next":{"headline":"Bluetooth: L2CAP: Fix uaf in l2cap_connect","id":"CVE-2024-49950"},"packages":[],"prev":{"headline":"net: add more sanity checks to qdisc_pkt_len_init()","id":"CVE-2024-49948"},"products":["Linux"],"published":"2024-10-21","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A local attacker can cause a kernel crash via a crafted GSO packet, leading to denial of service in the Linux kernel network stack.","url":"https://insights.sbomify.com/CVE-2024-49949/"}