Alertas de Seguridad de la Información

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63984] In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: fix hdrlen overflow …

In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() ipv6_rpl_srh_decompress() computes: outhdr->hdrlen = (((n + 1) * sizeof(struct in6_addr)) >> 3); hdrlen is __u8. For n >= 127 the result exceeds 255 and silently truncates. With n=127 (cmpri=15, cmpre=15, pad=0, hdrlen=16): (128 * 16) >> 3 = 256, truncated to…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63978] In the Linux kernel, the following vulnerability has been resolved: net/handshake: Drain pending re…

In the Linux kernel, the following vulnerability has been resolved: net/handshake: Drain pending requests at net namespace exit The arguments to list_splice_init() in handshake_net_exit() are reversed. The call moves the local empty "requests" list onto hn->hn_requests, leaving the local list empty, so the subsequent drain loop runs zero iterations. Pending handshake requests that had not yet be…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63938] In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request ind…

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request indices against the actual size of the buffer When processing Page State Change (PSC) requests, validate the PSC buffer against the effective size of the scratch area, which could be less than the maximum size if the guest provided a pointer that isn't exactly at the start of the GHCB shared buffer.

nvdcriticovulnerabilidad CVSS 9.3 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63939] In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Compute the correct m…

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Compute the correct max length of the in-GHCB scratch area When setting the length of the GHCB scratch area, and the area is in the GHCB shared buffer, set the effective length of the scratch area to the max possible size given the start of the guest-provided pointer, and the end of the shared buffer. The code was "fi…

nvdcriticovulnerabilidad CVSS 9.3 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63940] In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Ignore Port I/O reque…

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Ignore Port I/O requests of length '0' Explicitly ignore Port I/O requests of length '0' (or count '0'), so that setting up the software scratch area (and other code) doesn't have to worry about underflowing the length, and to allow for WARNing on trying to configure the scratch area with len==0.

nvdcriticovulnerabilidad CVSS 9.3 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63922] In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after…

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing pa…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63924] In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh point…

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() ipv6_hop_jumbo() calls pskb_trim_rcsum(), which can change skb pointers. Let's recompute nh pointer to make sure any change won't mess things up.

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63912] In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined sin…

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63886] In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Validate C…

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Validate CHAP_R length before base64 decode chap_server_compute_hash() allocates client_digest as kzalloc(chap->digest_size) and then, for BASE64-encoded responses, passes chap_r directly to chap_base64_decode() without checking whether the input length could produce more than digest_size bytes of output. c…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63887] In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Bound iscs…

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf iscsi_encode_text_output() concatenates "key=value\0" records into login->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer allocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call sites in this function (lines 1398, 1411, 1424 in v7…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63888] In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix CRC ov…

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() Two latent bugs in the Text-phase handler, both present since the original LIO integration in commit e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1"): 1) DataDigest CRC buffer overread (4 bytes past text_in). text_in is …

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63857] In the Linux kernel, the following vulnerability has been resolved: net: airoha: Do not read uninit…

In the Linux kernel, the following vulnerability has been resolved: net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit() The transmit loop in airoha_dev_xmit() reads fragment address and length during its final iteration, when the loop index equals skb_shinfo(skb)->nr_frags, at which point the fragment data is uninitialized. While these values are never consumed, the read…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63830] In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy ac…

In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy across SG transforms The sk_msg sg.copy bitmap is part of the scatterlist entry ownership state. A set bit tells sk_msg_compute_data_pointers() not to expose the entry through writable BPF ctx->data. This protects entries backed by pages that are not private to the sk_msg, such as splice-backed file …

nvdcriticovulnerabilidad CVSS 9.4 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63825] In the Linux kernel, the following vulnerability has been resolved: gcov: use atomic counter update…

In the Linux kernel, the following vulnerability has been resolved: gcov: use atomic counter updates to fix concurrent access crashes GCC's GCOV instrumentation can merge global branch counters with loop induction variables as an optimization. In inflate_fast(), the inner copy loops get transformed so that the GCOV counter value is loaded multiple times to compute the loop base address, start i…

nvdcriticovulnerabilidad CVSS 9.8 NVD

M Crítico vulnerabilidad

19/07/2026

[CVE-2026-63808] In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-…

In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfat_find_dir_entry() In exfat_find_dir_entry(), the buffer_head obtained from exfat_get_dentry() is released with brelse(bh) before the fall-through TYPE_EXTEND branch reads the directory entry through ep (which points into bh->b_data): brelse(bh); if (entry_type == TYPE_EXTEND) { ..…

nvdcriticovulnerabilidad CVSS 9.8 NVD

L Crítico vulnerabilidad

19/07/2026

[CVE-2026-63800] In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnf…

In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracep…

nvdcriticovulnerabilidad CVSS 9.8 NVD

L Crítico vulnerabilidad

19/07/2026

[CVE-2026-53399] In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on se…

In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling i…

nvdcriticovulnerabilidad CVSS 9.8 NVD

L Crítico vulnerabilidad

19/07/2026

[CVE-2026-63795] In the Linux kernel, the following vulnerability has been resolved: 9p: avoid putting oldfid in p9_…

In the Linux kernel, the following vulnerability has been resolved: 9p: avoid putting oldfid in p9_client_walk() error path When p9_client_walk() is called with clone set to false, fid aliases oldfid. If the walk subsequently fails after the request has been sent, the error path jumps to clunk_fid, which currently calls p9_fid_put(fid) unconditionally. This drops a reference to oldfid even thou…

nvdcriticovulnerabilidad CVSS 10.0 NVD

L Crítico vulnerabilidad

19/07/2026

[CVE-2026-53398] In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decod…

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"…

nvdcriticovulnerabilidad CVSS 9.8 NVD

L Crítico vulnerabilidad

19/07/2026

[CVE-2026-53384] In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dw: unregister 825…

In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails dw8250_probe() registers the 8250 port via serial8250_register_8250_port() and then, if the device has a clock, registers a clock notifier. If clk_notifier_register() fails, probe returns the error but leaves the 8250 port registered. The matching serial8250_…

nvdcriticovulnerabilidad CVSS 9.8 NVD