CVE-2025-21704
CVE-2025-21704 is covered by the Red Hat LSN-0119-1 security bulletin. Not in the CISA KEV catalog. 1 advisory from Red Hat.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
CVE-2025-21704 key facts
- CISA KEV
- Not listed (catalog checked )
- Vendor advisories
- 1 from Red Hat
- VulniPulse record
- Published
Is CVE-2025-21704 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-21704 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-21704?
This CVE is tracked through a multi-CVE bulletin, so its fixed releases may differ from the bulletin-wide values below. Check the vendor source.
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Vendor advisory comparison
Red Hat
1 advisory- Advisory severityUnrated
Advisory [CVE-2024-56581 +7] Kernel Live Patch Security Notice
LSN-0119-1Source published
This bulletin covers 8 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
In the Linux kernel, the following vulnerability has been resolved: btrfs: ref-verify: fix use-after-free after invalid ref action At btrfs_ref_tree_mod() after we successfully inserted the new ref entry (local variable 'ref') into the respective block entry's rbtree (local variable 'be'), if we find an unexpected action of BTRFS_DROP_DELAYED_REF, we error out and free the ref entry without removing it from the block entry's rbtree. In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix oops due to NULL pointer dereference in brcmf_sdiod_sglist_rw() This patch fixes a NULL pointer dereference bug in brcmfmac that occurs when a high 'sd_sgentry_align' value applies (e.g. 512) and a lot of queued SKBs are sent from the pkt queue. In the Linux kernel, the…
- Related products — impact not confirmed
- Ubuntu 25.10
- Ubuntu 24.04
- Ubuntu 22.04
- Ubuntu 20.04
3 more entries in the full advisory.
- Source-reported affected versions
- Ubuntu 25.10
- Ubuntu 24.04
- Ubuntu 22.04
- Ubuntu 20.04
2 more entries in the full advisory.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).
More Red Hat advisories
- CVE-2025-37849Jun 1, 2026Kernel Live Patch Security Notice
- CVE-2026-123158Nov 5, 2026Password authentication bypass via password hash misinterpretation
- CVE-2026-119977Oct 31, 2026Arbitrary code execution via predictable upgrade staging paths
- CVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli Decoder
- CVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-free
- CVE-2026-109618Oct 21, 2026OOM bailout during request parsing leads to memory corruption and RCE
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